Normal adult hemoglobin consists of Hb A (more than 95%) and Hb A2 (2.5 - 3.5%) and will demonstrate a negative sickle screen. Hemoglobin S is due to a structural variant of hemoglobin and demonstrates a positive sickle screen whether the patient is of the disease or of the trait variety. Note: This test should not be used for patients less than 6 months of age.
Whole Blood (EDTA)
1 mL, test can be done on CBC tube, no extra tube is required if the CBC is ordered at the same time