<p class="first" id="d2999639e134">Multiple mathematical equations inform the practice
of transfusion medicine. These
equations apply to a wide range of topics: dosage of blood products, calculation of
fluid volumes, and even specific treatment decisions (e.g. corrected count increment
for determination of platelet refractoriness). The calculation of these equations
can be complicated, prone to error, and time-consuming. A trusted source is needed
to accurately perform these calculations 24 hours a day without error and without
monetary cost. We sought to build internet-enabled calculators relevant to the practice
of transfusion medicine. We partnered with MDCalc, an online host of medical calculators
with 1 million monthly users in 196 countries, to design and host the calculators.
The calculators guide users in the application of transfusion medicine equations by
providing indications for use, inputs for the equations variables, error-checking,
warnings for bad inputs, and interpretive guidance of the result. The following calculators
were built: blood volume, corrected count increment (CCI), plasma dosage, cryoprecipitated
antihemophilic factor dosage, approximate number of units for compatibility testing,
maternal-fetal hemorrhage Rh(D) immune globulin dosage, intrauterine RBC transfusion
dosage, neonatal polycythemia partial exchange, theoretical removal of a substance
by plasmapheresis, sickle cell RBC exchange volume, peripheral blood stem cell collection,
and a calculator relevant to donor lymphocyte infusion. Clinicians can now utilize
this reputable and highly visible online source to access these common transfusion
medicine equations at any time with an internet-enabled device (https://www.mdcalc.com/search?filter=transfusion+medicine).
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