Effect on A1C | Conditions |
---|---|
Falsely low | Chronic blood loss; autoimmune hemolytic anemia; thrombotic microangiopathy; malignant hypertension; sickle cell anemia; thalassemia; certain hemoglobinopathies; glucose-6-phosphate dehydrogenase deficiency; intra-red cell alkalosis; hypertriglyceridemia; malaria; HIV; other chronic infections; hemodialysis |
Falsely high | Iron deficiency; vitamin B12 deficiency; persistence of fetal hemoglobin; intra-red cell acidosis; splenectomy; hyperbilirubinemia; alcoholism; smoking |
Variable effects | Chronic kidney disease; pregnancy; certain hemoglobin variants; methemoglobin; recent blood transfusion; cancer; chronic liver disease |
Interfering medications: iron-replacement therapy; treatment for vitamin B12 deficiency; anti-malarial drugs; sulfonamides; aspirin; vitamins C or E; antiretrovirals; ribavirin; dapsone; hydroxyurea; chronic opioid use |