Hemoglobin is the protein in red blood cells that carries oxygen. GHb forms when glucose in the blood attaches to the hemoglobin. The GHb test requires only one sample of blood, which can be taken at any time of the day, even right after a meal. Although a high GHb almost always means IGT or diabetes, people with IGT or diabetes can have normal GHb levels. So the GHb test is not used to diagnose diabetes.
Doctors use it to monitor blood glucose control.
After the diagnosis of diabetes, the doctor will take many factors into account to determine which type of diabetes you have. People with type 2 are most often diagnosed when they are over 30 and obese. They usually do not have urine ketones. Of course, there are exceptions to these categories. Whatever type you have, the goal of treatment is to get your blood glucose levels as close to normal as possible.