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Misdiagnosis of Hb constant spring (alpha142, Term-->Gln, TAA-->CAA in alpha2) in a Hb H (beta4) disease child.
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Abstract
Hb Constant Spring (Hb CS; alpha142, Term-->Gln, TAA-->CAA in alpha2) is the most prevalent nondeletional alpha-thalassemia (thal) in Southeast Asian populations. It is difficult to detect on electrophoresis in its heterozygous state because of the low Hb CS levels. We found a case with Hb H (beta4) disease who, at birth, was initially assumed to have deletional alpha-thal mutations, but eventually proved to have a Hb CS defect.