Imperial Collage Healthcare

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Dye binding

Test Background
The fluorescent dye EMA (eosin-5-maleimide ) is used to label band 3 protein, which indirectly interacts with the spectrin-based cytoskeleton and membrane lipid bilayer in red blood cells. Deficiency or abnormality of band 3 is seen in hereditary spherocytosis red cells, and has also been observed in cases of Southeast Asian ovalocytosis, congenital dyserythropoietic anaemia type II, and the cryohydrocytosis variants of stomatocytosis.

Clinical Indications
Unexplained haemolysis Spherocytosis Suspected hereditary spherocytosis

Reference Range
0.83-1.17 (ratio)

Sample Required
4 mL EDTA (lavender top) adults 0.5 mL EDTA (lavender top) paediatrics

Sample Volume
0.5 mL adult tube 0.2 mL paediatric tube

Turnaround Time
Within 4 working days

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