Table 5.
Conditions that can falsely increase or decrease HgbA1c values
Falsely low HgbA1c | Falsely high HgbA1c |
---|---|
1. Hemoglobinopathies | 1. Hemoglobinopathies |
Hgb S | fetal hemoglobin |
Hgb D | Hgb Stanleyville II |
Hgb GRAZ | Hgb OSU-Christiansborg |
Hgb TAKAMATSU | Hgb Raleigh |
Hgb G-SZUHU | Hgb D |
Hgb ETOBICOKE | Hgb K-Woolwich |
Hgb O Padova | 2. Carbamylated hemoglobin |
methemoglobinemia | 3. Anemia |
2. Hemolysis | Iron deficiency |
3. Medications | Vitamin B12 deficiency |
Dapsone | Folate deficiency |
Methylene blue | |
Phenacetin | |
Benzene derivatives | |
Vitamin C excess | |
4. Chronic lymphocytic leukemia | |
5. Nitrates | |
6. Hereditary spherocytosis | |
7. Hemodialysis | |
8. Venesection | |
9. Post blood transfusion |
Hgb indicates hemoglobin.