Introduction: In early December 2019, a new contagious disease were identified in China (1) and caused by as a novel beta coronavirus (2) that has currently been named severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) (3). It causes respiratory illness named by World Health Organization as coronavirus disease 2019 (COVID-19) and has become a global viral pandemic and a public health problem of international concern (4). The SARS-CoV-2 infection presents with a broad clinical spectrum, including asymptomatic infection, mild upper respiratory tract infection, to a life-threatening multi-organ failure. This broad clinical presentation is an evidence of the multiple targets of SARS-CoV-2 including digestive, cardiovascular, urinary systems (5, 6, 7). Similar to SARS, SARS-CoV-2 recognizes the N-terminal peptidase domain of angiotensin converting enzyme 2 (ACE2) at the surface of the cell membrane using the S domain and invade the host (8). Based on this relationship between ACE2 and SARS-CoV-2, the susceptibility of SARS-CoV-2 infection is higher in any cells expressing ACE2. Meng-Yuan et al. demonstrated that the ACE2 protein had high expression level in testis, kidney, small intestine, heart, thyroid and adipose tissue (9). (10). Wang ZP et al. analyzed scRNA-seq datasets obtained from Gene Expression Omnibus and Sequence Read Archive, and showed that ACE2 is highly expressed in spermatogonia, Leydig and Sertoli cells (11). As a consequence, testicular tissue may be a target tissue of SARS-CoV-2. After the binding of SARS-CoV-2 to ACE2 and virion membrane fusion, downregulation of ACE2 expression leads to excessive production of angiotensin by the related enzyme ACE (12). A previous study showed that increased replication of coronaviruses downregulate the expression of ACE2 (13). Overproduction of angiotensin enhances oxidative stress mechanisms and leads to tissue injury. In sum, these findings may explain the possibility of harmful effects of SARS-CoV-2 on testis, potentially affecting TT secretion. In analogy to this relationship, it has been shown that the testis may be the target organ for other viruses, including human immunodeficiency virus, mumps, Zika and Ebola causing orchitis, and occasionally decreased TT production and oligospermia (14). Acute respiratory infection is another cause of decreased serum total testosterone (TT) levels. Muehlenbein MP et al. hypothesized that TT levels decreases during acute infection and they evaluated patients with respiratory tract infection (15). The cases of their study experienced 10% lower salivary TT levels during respiratory tract infection compared with recovered period. In another study by Iglesias P et al., the authors evaluated serum TT levels in hospitalized patients (16). Their results demonstrated that serum TT levels were associated with respiratory tract infection and were significantly lower in patients with respiratory tract infection. Moreover, the main cause of hospitalization of hypogonadic patients was respiratory tract infection. The present study aimed to compare male reproductive hormones such as TT, luteinizing hormone (LH), follicle stimulant hormone (FSH) and prolactin between patients with COVID-19, age-matched cases with non-COVID-19 respiratory tract infection and age-matched controls. Material and Methods: Study design: This study was reviewed and approved by institutional ethics committee, on 27 April 2020 and complied with the Declaration of Helsinki. The information for all patients including demographic data, clinical characteristics, laboratory parameters and outcomes, were collected prospectively. Two authors independently reviewed the data collection forms to ensure that there was no duplicated information. Data were analyzed and interpreted by the authors. Study population: The study population comprised three groups including patients hospitalized for COVID-19, hospitalized cases with non-COVID-19 respiratory tract infection between 22 March and 22 May 2020 and age-matched controls admitted to the urology outpatient department before January 2020. The first group was patients with COVID-19, the second groups included patients with non-COVID-19 respiratory tract infection, and the third consisted of control cases admitted to urologic outpatient clinic for reproductive function evaluation. The first inclusion criteria for whole groups was age between 18 and 65 years. Additional inclusion criteria for group-1 were (1) positive reverse-transcription polymerase chain reaction (RT-PCR) test of nasal and pharyngeal swab specimens (2) typical chest CT findings including ground-glass opacities, particularly on peripheral and lower lobes, crazy paving and bilateral multiple lobular and subsegmental areas of consolidation. Patients with non-COVID-19 respiratory tract infection had final diagnosis of at least two negative RT-PCR tests and negative chest CT findings. The exclusion criteria for all study subjects were (1) previous exposure to exogenous testosterone, 5-alpha reductase inhibitors, luteinizing hormone–releasing hormone agonists, dehydroepiandesterone, clomiphene citrate, or other selective estrogen receptor modulators (2) use of opioid drugs within 3 months prior to study (3) diagnosis of prolactinoma and any cancer (4) history of testicular diseases and surgical interventions known to affect sex hormone levels. Nasal and pharyngeal swab specimens were collected for the COVID-19 test on the day of admission. RT-PCR assay was used according to the manufacturer’s instructions. The degree of severity (mild, moderate, and severe) were determined according to the COVID-19 Treatment Guidelines published by the National Institutes of Health (17). Clinical, Laboratory and Imaging Parameters: The recent medical history, clinical symptoms or signs on admission were extracted from electronic medical records. Radiologic assessments included CT, and all laboratory testing was performed according to the clinical care needs of the patient. Laboratory assessments were drawn before any treatment the first morning after admission between 8-11 am, after an overnight fast, and consisted of a blood count, C-reactive protein (CRP), procalcitonin (PCT), D-dimer and fibrinogen. After analyzing of blood samples for routine tests required for group-1 and group-2 patients’ needs, the residual serum samples were collected for male hormone profiles detection. The data of serum TT, FSH, LH and prolactin levels were retrieved from the medical records kept in the hospital. Laboratory analyses were performed in the central laboratory of the hospital with commercially available kits normally used for clinical practice of the hospital. The presence of a radiologic abnormality on the basis of the documentation or description in medical charts was determined. Definitions: Testosterone deficiency was defined as 300 ng/dL) and elevated LH (> 9.4 IU/L) according to European Male Aging Study criteria (19). Outcomes: The primary outcome of the study was detection of the difference of TT, FSH, LH and prolactin levels between the groups. Secondary outcome was to correlate TT and hospitalization time and oxygen saturation on hospital admission (SpO2) of patients. Statistical Analysis: Sample size calculation was based on changes in serum TT levels. Type I error α was 0.05, type II error β was 0.10, two-tailed P-value was <0.05, study and control group ratio was 1:1, loss to follow-up rate was 10%, and at least 90 patients in each group were studied in the final analysis. Data were checked for suitability for a normal distribution with the Shapiro Wilk test and expressed as mean (SD) or median [interquartile range (IQR)] values when they did not show a normal distribution or percentage for continuous and categorical variables, respectively. Variables were compared between groups by using the Fisher exact test or chi-square test for categorical variables. Kruskal Wallis test with Bonferroni correction was used for multiple and pairwise comparisons, for continuous variables. Pearson’s correlation test was used for investigating relationship between continuous variables. All analyses were performed by STATA, version 14 (Stata Corp., College Station, TX, USA). For all the statistical analyses, p<0.05 was considered significant. Results: Demographics and Characteristics of the Study Population: Baseline demographic and clinical characteristics for the patients with COVID-19 (n=89), those with non-COVID-19 respiratory tract infection (n=30) and those with neither COVID-19 nor respiratory tract infection (n=143) presented in Table-1. Mean age of the study population was 50.28±9.8 years (20-65 years). The mean age of study groups was 49.9±12.5 years, 52.7±9.6 years and 50±7.8 years, respectively. Cases in three study groups were similar of age (p=0.06). Clinical characteristics of COVID-19 patients: Eighty nine cases infected with COVID-19 were studied (Table-1). Fever (54%) and cough (49.4%) were the most common symptoms. Thirty cases (33.7%) had shortness of breath. Moreover, 29 (32.6%) patients had myalgia, 12 patients (13.5%) had sore throat, and 8 patients (18.56%) had chest pain symptoms. During the diagnostic procedure by RT-PCR, we found that 77 patients (86.5%) got a positive result in the first test, 12 patients (13.5%) got a positive result in the second test. Among 89 patients with COVID-19, 52.8% (47/89) were diagnosed as “mild type”, 33.7% (30/89) as “moderate type”, and 13.5% (12/89) as “severe type”. Clinical characteristics of patients with non-COVID-19 respiratory tract infection: Thirty patients had non-COVID-19 respiratory tract infection were studied (Table-1). Fever (46.7%) and dyspnea (40%) were the most common symptoms. Seven cases (23.3%) had chest pain and 7 cases (23.3%) had cough. Also, 5 (16.6%) patients had myalgia, 3 patients (10%) had sore throat symptoms, and 2 (6.6%) had diarrhea. Twenty-one patients had two negative RT-PCR, 8 patients had 3 negative RT-PCR tests, and one patient had 5 negative RT-PCR test. All patients with non-COVID-19 respiratory tract infection had non-specific CT findings. Comparison of inflammation parameters of study groups: The clinical presentation of patients with COVID-19 and patients with non-COVID-19 respiratory tract infection was similar (p=0.14) (Table-1 ). Only the COVID-19 patients had more cough symptom than other group (p=0.018). The comparison of inflammation parameters are presented in Table-2. The white blood cell count of the COVID-19 group (median 6.08 109/L, IQR 3.36 109/L) was significantly lower than that of the non-COVID-19 respiratory tract infection (median 8.71 109/L, IQR 4.98 109/L) and control group (median 7.7 109/L, IQR 2.52 109/L) (p=0.0001). It was not different between non-COVID-19 respiratory tract infection and control group (p=0.07). The lymphocyte count in the COVID-19 group (median 1.4 109/L, IQR 0.83 109/L) was also significantly lower than that in the non-COVID-19 respiratory tract infection (median 2.13 109/L, IQR 1.46 109/L)and control group (median 2.3 g/L, IQR 0.96 g/L) (p=0.0001). The lymphocyte count was not different between non-COVID-19 respiratory tract infection and control group (p=0.07). Table-1 Demographic and clinical parameters of study groups. Group-1 (n=89) Group-2 (n=30) Group-3 (n=143) p Age (years) (mean±SD) 49.9±12.5 52.7±9.6 50±7.8 0.06 Symptoms [n (%)]FeverCoughSore throatMyalgiaDyspneaChest painDiarrheaAnosmia 48 (54)44 (49.4)12 (13.5)29 (32.6)30 (33.7)8 (18.56)3 (3.3)2 (2.2) 14 (46.7)7 (23.3)3 (10)5 (16.6)12 (40)7 (23.3)2 (6.6)0 (0) n/a 0.14 SD: standard deviation Hemoglobin levels of patient and control groups were not statistically different (p=0.0574) (Table-2 ). CRP levels were significantly higher in patients with COVID-19 and non-COVID-19 respiratory tract infection than control group (p=0.0007 and p=0.03). However, COVID-19 and non-COVID-19 respiratory tract infection groups were similar in terms of CRP (p=1). In addition, the D-dimer, procalcitonin and fibrinogen levels were not significantly different between group-1 and group 2 (p=0.03, p=0.51 and p=0.32, respectively). Table-2 Inflammation parameters of study groups Group-1 (n=89) Group-2 (n=30) Group-3 (n=143) p Median Hb, g/dL 14.42±3.37 13.13±2.48 14.5±1.58 0.0574 Median (IQR) WBC, x 109/L 6.08 (3.36) 8.71 (4.98) 7.7 (2.52) 0.0001* Median (IQR) LYM, x 109/L 1.44 (0.83) 2.13 (1.46) 2.3 (0.96) 0.0001# Median (IQR) CRP, mg/dL 42.46 (58.97) 29.93 (68.98) 0.6 (1.81) 0.01ψ Median (IQR) d-dimer, mg/L 0.54 (0.62) 0.86 (1.71) n/a 0.007 Median (IQR) procalcitonin, ng/mL 0.07 (0.13) 0.07 (0.21) n/a 0.51 Median (IQR) fibrinogen, mg/dL 496.7 (164.6) 413.15 (208.2) n/a 0.32 Post-hoc analyses: ∗: 1 vs. 2 p<0.0001; 1vs. 3 p=0.017; 2 vs.3 p=0.07 #: 1 vs. 2 p<0.0001; 1 vs. 3 p=0.0017; 2 vs. 3 p=0.07 ψ: 1 vs. 2 p=0.31; 1 vs. 3 p=0.0065; 2 vs. 3 p=0.03 IQR: interquartile range Comparison of hormonal level: The comparison of TT levels showed a significant difference between the groups (p=0.0001). Serum TT levels decreased from median 332 ng/dL in control cases to median 288.67 ng/dL in patients with non-COVID-19 respiratory tract infection to median 185.52 ng/dL in patients with COVID-19. The proportion of patients with testosterone deficiency in group-1, group-2 and group-3 was 74.2%, 53.3 and % 37.8, respectively (p<0.0001). Four cases (4.5%) in COVID-19 group had compensated or subclinical hypogonadism and only a patient in group-2 (3.33%) had this diagnosis (p=0.06). COVID-19 patients and non-COVID-19 respiratory tract infection patients had significantly higher serum LH (p=0.0003) and serum PRL (p=0.0007) levels compared to control cases. However, there was not a difference between group-1 and group-2 (p=1 and p=1). When serum FSH levels were compared, the groups had similar levels of FSH levels (p=0.91). The ratio of LH/TT is lowest in patients with COVID-19 (Table-3 ). Table-3 Hormonal levels of study groups. Group-1 (n=89) Group-2 (n=30) Group-3 (n=143) p Median (IQR) TT, ng/dL 185.52 (179.12) 288.67 (184.39) 332 (118) 0.0001∗ Median (IQR) LH, U/L 5.67 (4.52) 5.39 (2.46) 4.1 (2.62) 0.0002# Median (IQR) prolactin, μg/L 9.6 (5.59) 9.61 (9.69) 7.5 (1.86) 0.0009ψ Median (IQR) FSH, U/L 6.01 (6.17) 5.65 (6.19) 6.05 (4.85) 0.87 Median LH/T 0.03 (0.029) 0.0205 (0.051) 0.011 (0.011) 0.0001ϒ Post-hoc analyses: ∗: 1 vs. 2 p=0.002; 1 vs. 3 p<0.0001; 2 vs. 3 p=0.04 #: 1 vs. 2 p=1; 1 vs. 3 p=0.0001; 2 vs. 3 p=0.01 ψ: 1 vs. 2 p=1; 1 vs. 3 p=0.0007; 2 vs. 3 p=0.03 ϒ: 1 vs. 2 p=0.048; 1 vs. 3 p<0.0001; 2 vs. 3 p<0.0001 IQR: interquartile range TT: total testosterone LH: luteinizing hormone FSH: follicle stimulant hormone The Impact of Severity of COVID-19 on Reproductive Hormones: The comparison of hormone levels of COVID-19 patients classified into 3 different groups according to disease severity presented in Table-4 . Despite the serum TT levels of patients with severe illness were lower than other patients, this difference was not statistically different (p=0.084). However, serum LH and FSH levels were significantly lower in the patients with severe illness (p=0.0348). Table-4 Hormonal levels of patients classified according to the severity of the disease. Mild Moderate Severe p Median (IQR) TT, ng/dL 203.51 (210.01) 179.61 (105.55) 82.01 (264.08) 0.0837 Median (IQR) LH, U/L 5.59 (4.3) 7.32 (4.62) 3.71 (5.71) 0.0107* Median (IQR) prolactin, μg/L 9.05 (5.95) 10.35 (4.91) 11.55 (32.02) 0.1683 Median (IQR) FSH, U/L 5.8 (5.76) 7.59 (7.74) 3.84 (3.49) 0.0348# Post-hoc analyses: ∗: 1 vs. 2 p=0.109; 1 vs. 3 p=0.1085; 2 vs. 3 p=0.005 #: 1 vs. 2 p=0.165; 1 vs. 3 p=0.205; 2 vs. 3 p=0.0182 IQR: interquartile range TT: total testosterone LH: luteinizing hormone FSH: follicle stimulant hormone Correlation between TT and clinical parameters of patients: Pearson's correlation test was performed for investigating any significant relationships between serum TT levels and hospitalization time of patients with COVID-19. Serum TT was found to be negatively associated with hospitalization time of patients with COVID-19 (r=-0.45, p<0.0001) (Figure-1a ). In addition, according to the results, a significant positive correlation was observed between SpO2 and serum TT levels in patients with COVID-19 ( r=0.32, p=0.0028) (Figure-1b). However, no significant correlations were observed between TT and hospitalization time (Figure-1c) and SpO2 levels (Figure-1d) in patients with non-COVID-19 respiratory tract infection (r=-0.25, p=0.21 and r =-0.077, p=0.68). Moreover, the correlation between serum TT levels and neutrophil and lymphocyte counts and CRP levels was evaluated and it was not detected any significant association between these parameters. In the present study, only 4 patients with COVID-19 died and the mean levels of serum TT of this patients (116.24) was below the median levels of patients with COVID-19. Fig 1 : Discussion: To the best knowledge, despite this manuscript does not present firstly the evaluation of reproductive hormonal levels in COVID-19 patients, it demonstrates for the first time that lower levels of TT are presented in patients with COVID-19. Also, the serum TT levels were compared in different groups of COVID-19 patients classified according to the severity of illness. There was no significant decrease in serum TT levels, even though severity of COVID-19 increased. Serum TT levels were higher in patients with non-COVID-19 respiratory tract infection, but it was lower than controls. The lowest LH/TT ratio was observed in patients with COVID-19. The diagnosis of testosterone deficiency were higher in patients with COVID-19 compared to patients with non-COVID-19 respiratory tract infection and control group (p<0.00001). However, compensated or subclinical hypogonadism was not different between (p=0.06). Moreover, serum LH and prolactin levels were higher in patients with COVI-19 and non-COVID-19 respiratory tract infection. Interestingly, even though the prolactin levels did not differ with the severity of disease, the patients with severe disease had lowest LH levels in comparison with mild and moderate disease patients. Despite of harmful influence of SARS-CoV-2 on LH and TT levels, FSH levels did not differ between patients and control cases. Noteworthy, this study demonstrated a positive relationship between lower TT and longer hospitalization time, thus leading to a prediction of the progression of the disease of patients with COVI-19. Accordingly, lower TT are significantly associated with lower SpO2 levels at admission of patients with COVID-19. However, this relationship was not observed in patients with non-COVID-19 respiratory tract infection, because higher serum TT levels in this patient group compared to COVID-19 patients. Clinical presentation of patients with COVID-19 did not differ from patients with non-COVID-19 respiratory tract infection. Both of groups presented similar symptoms on admission. In the literature, there are several studies demonstrated that the testis is susceptible to viral infection (20). In comparison to bacterial infections that normally target accessory glands and epididymis, viruses that circulate in the blood primarily attack testis. It is known that a human immunodeficiency virus (HIV), mumps virus and Zika virus may induce reduction in testosterone production in human, feline leukemia virus in cats and bluetongue virus in ruminants (20, 21, 22). The deleterious effects of viruses involve the direct damage of testicular tissue, destruction of Leydig cells and decreasing testosterone production. Puggioni et al. showed that bluetongue virus replicated in the endothelial cells of the peritubular areas within the testis (22). It caused to enhanced type-I interferon response, reduction in testosterone biosynthesis by Leydig cells, and even destruction of Sertoli cells (22). However, a current study by Ma et al. comparing the sex-related hormones between COVID-19 patients and controls did not show any difference in serum TT and FSH levels between COVID-19 patients and control cases (23). This result is not compatible with the findings of this study, because of decreased serum TT and FSH levels of patients with COVID-19 compared to age-matched males. LH The testicular function may be effected by multiple pathogenic mechanisms occurring during SARS-CoV-2 infection. ACE2 is highly expressed by Leydig cells and its down-expression by SARS-CoV-2 lead to increase of angiotensin II levels (12). It has been shown that angiotensin II reduced both basal and LH stimulated testosterone synthesis by Leydig cells, ACE2 may modulate the production of testosterone of these cells and protect testis by limiting angiotensin II detrimental effects (24, 25). In this context, changes in LH and TT levels of patients were evaluated in present study and it has been determined that patients with COVID-19 had increased levels of LH and decreased levels of TT compared to patients with non-COVID-19 respiratory tract infection and control cases. Moreover, the lowest LH/TT ratio was calculated in patients with COVID-19. In the literature, several studies suggested that increased LH/TT ratio indicates Leydig cell defects and it is an important marker of primary hypogonadism (26). Primary hypogonadism is a result of factors having negative influence on testicular tissue such as injury, tumor and infections. This finding supports the impact of harmful effect of SARS-CoV-2 on ACE2 expression and correspondingly increase of angiotensin II and reduction of testosterone production. Compensated hypogonadism is defined TT in the normal range and inappropriately high LH (19). In European Male Aging Study including 3,369 community-dwelling middle-aged and older men, they reported that 9.5% of the aforementioned population was classified as compensated hypogonadism. Dutta et al presented compensated hypogonadism rates as 12.44% in 225 patients with human immunodeficiency virus (HIV) infection (27). The rate of compensated hypogonadism in this study was 4.5% in COVID-19 patients. The rate of compensated hypogonadism in COVID-19 patients was lower than the study by Dutta et al., because the disease duration of HIV patients was 40 months and this long time may influence negatively the hormonal status of patients. However, the rate of COVID-19 patients is based on acute phase effects of disease and the evaluation of long term effects of COVID-19 on hormonal status may contribute to understand its hormonal impacts. The serum PRL level also significantly elevated in COVID-19 patients and in patients with non-COVID-19 respiratory tract infection compared to control cases (p=0.0009). However, this elevation reached not to levels of hyperprolactinemia. Therefore this is not a cause of pituitary suppression and decreased TT levels. Serum PRL levels may be influenced by stress and infection (28). In addition, cytokines IL-1, IL-2, and IL-6 stimulate prolactin secretion (29). The increased levels of IL-1, IL-2 and IL-6 in patients with COVI-19 has been demonstrated in several studies (30). This relationship between increased levels of interleukins and suppression of prolactin secretion explained the elevated levels of prolactin in patients with COVID-19. In present study, the TT levels correlated negatively with hospitalization time (r=-0.395, p<0.0001) and positively with SpO2 levels at admission of patients with COVID-19. This finding demonstrates that serum TT levels is an important factor and predictor for the clinical process of patients. Rastrelli et al. evaluated the association between TT levels and clinical outcomes in a cohort of patients with COVID-19 (31). They demonstrated that lower TT levels predict poor prognosis in patients with COVID-19. They correlated TT levels with neutrophil and lymphocyte counts and CRP levels and they found a negative correlation between serum TT levels and neutrophil count and CRP levels and a positive correlation between TT levels and lymphocyte count. However, in the present study, serum TT levels did not correlated with neutrophil and lymphocyte counts and CRP levels. Testosterone deficiency is one possible cause of unexplained anemia in older men, because of the lack of stimulating effect of testosterone on erythropoiesis. Despite of lower levels of testosterone in patients with COVID-19, the hemoglobin levels were not different from patients with non-COVID-19 respiratory tract infection and control subjects. The reason for this indifference could be divided into two subjects. First of them is long life-span of erythrocytes and short incubation period of COVID-19. After 4-6 days incubation period, symptoms onset occurred and patients admitted to the hospitals and were included into this study. An erythrocyte has a life-span 90-120 days in human circulation. The time interval is not enough to cause in a decrease in hemoglobin levels. In addition, myelosuppressive chemotherapy is an important factor for the treatment-associated anemia and this anemia is detectable at least 4-6 weeks after this therapy due to the life-span of erythrocytes in serum (32). The second factor is the required time for the suppression of erythropoiesis by testosterone deficiency. The exact mechanism for the regulation of erythropoiesis by testosterone is not fully understood. Testosterone stimulates erythrocyte production by various mechanisms including stimulation of erythropoietin release, direct stimulatory action on bone marrow erythroid progenitor cells via androgen receptors and iron regulatory protein hepcidin (33). In the light of aforementioned evidences, it is not surprising testicular deficiency leads to anemia. However, the onset of anemia needs a period of time. Hamilton et al., presented a time span for hemoglobin reduction as 1 g/dl after involuntary castration in 6 prisoners as 40 days. In another study of 147 prostate cancer patients receiving combined androgen blockage, hemoglobin levels decreased in all patients from a mean baseline of 14.9 g/dL to means of 13.9 at 1 month (34). With these findings, the indifference of hemoglobin levels between patient and control groups is logical. This study has several strengths. The study provides the evidence about the alteration of male reproductive hormones under COVID-19. In this study, serum LH and prolactin levels significantly elevated and serum TT levels decreased in COVID-19 patients, which infer to the potential hypogonadism. Because greater portion of patients with COVID-19 were reproductive-aged, cases, who recovered from this disease, should be evaluated with hormonal tests to detect harmful effects of SARS-CoV-2 on reproductive system. There are several limitations in our study. First, the analysis in our study was limited to one general hospital, but all cases had fulfilled the laboratory diagnosis of COVID-19. Control group included patients who admitted to urology outpatient clinic and evaluated for reproductive function had hormonal abnormalities. As another limitation, only a single measurement of TT was available. Moreover, free and bioavailable testosterone levels were not evaluated. Another limitation was neither semen analysis nor determination of SARS-CoV-2 in semen was performed, which are more clear evidence for SARS-CoV-2 induced testis injury. Psychological stress is another factor effecting serum TT levels. A current study evaluated psychological status of patients admitted with COVID-19 and presented that the predominant emotional state of patients for most days during the stay or for almost all the days during the hospital stay was that of anxiety (92 %), remaining worried (96 %), and feeling isolated (90 %) (35). However, the authors could not compare their results with that of existing literature because of limited data on experiences of people with COVID-19. Several studies evaluating the impact of stress on hormonal function in both human and animals confirmed that psychological stress, especially chronic stress, inhibiting role in testosterone production (36). Contrary to these studies presenting the decreasing effect of stress in serum testosterone levels, in the literature, it has been shown psychological stress does not constantly inhibit testosterone secretion (37). In addition to this contradictory studies, a few studies exist which presented that testosterone concentration may be increased at initial stages of acute stress (38, 39). Based on the aforementioned findings, it is not possible to associate the reduction of serum TT levels in patients with COVID-19 with their psychological stress in acute phase of the disease. However, even if not the lack of the evaluation of the emotional status of patients and controls is a limitation of the study. Conclusion: This study demonstrates COVID-19 is associated with decreased level of TT and increased level of LH and prolactin. More serious COVID-19 causes more reduction in TT levels and prolongs hospitalization period. In light of these findings, physicians may consider to evaluate male patients with COVID-19 for concomitant androgen deficiency.
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