Hemoglobin A1C (also called HgA1C or A1C) is a measure of glycated hemoglobin.

CNN: Why do my A1C results from different sources vary?

Records showed that al-Khawaja had lost about 10 kilograms (22 pounds) and had a low hemoglobin level, though not critically low, the government said.

CNN: STORY HIGHLIGHTS

In a patient with a known hemoglobin disorder, the doctor may want to specifically request that the HgA1C assay be done by boronate affinity chromatography.

CNN: Why do my A1C results from different sources vary?

There are several HgA1c assays or tests that do not give accurate readings with patients who may have an underlying hemoglobin disorder, also called a hemoglobinopathy.

CNN: Why do my A1C results from different sources vary?

This is a method that is less affected by hemoglobin disorders.

CNN: Why do my A1C results from different sources vary?