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To assess for an enzyme deficiency to assist in diagnosis of hemolytic anemia.
Whole blood collected in yellow-top (acid-citrate-dextrose [ACD]) tube. Specimens collected in a lavender-top (EDTA) or green-top (heparin) tube also may be acceptable in some laboratories.
(Method: Enzymatic) 4.6–11.2 units/g Hgb.