The term HbA1c refers to glycatedhaemoglobin. It typically develops when haemoglobin joins with glucose in the bloodstream, becoming ‘glycated.’ It is also known as haemoglobinA1c. By measuring glycatedhaemoglobin (HbA1c), doctors can get an overall picture of average blood sugar levels over a period of weeks/months. An HbA1c test is an important blood test that gives a good indication of how well an individual’s diabetes is being controlled. Together with the fasting plasma glucose test, the HbA1c test is one of the main methods in which type 2 diabetes is diagnosed.
When the body processes sugar, glucose naturally attaches to haemoglobin in the bloodstream. This bonding of glucose and haemoglobin is known as glycation. The amount of glucose combined with this protein (haemoglobin) is directly proportional to the total amount of sugar that is available in the system at that time. Because red blood cells in the human body survive for approximately 120 days before renewal, measuring glycatedhaemoglobin (or HbA1c) can be useful in reflecting the average blood glucose levels over that duration, providing a beneficial longer-term gauge of blood glucose control.
HbA1c test is ordered to check for diabetes or prediabetes in adults. Prediabetes is the condition in which the blood sugar levels show an individual is at the risk of getting diabetes. If anyone already has diabetes, an HbA1c test can help monitor their condition and glucose levels.
HbA1c tests are usually reliable, but at the same time, there are some limitations to the accuracy of the test. For example, individuals with forms of anaemia may not have sufficient haemoglobin levels for the test to be accurate and may need to have a fructosamine test additionally.
Being pregnant or having an uncommon form of haemoglobin (called haemoglobin variant) can also lead to an inaccurate HbA1c. At the same time, readings can also be affected by short term issues such as illness since they can cause a temporary rise in blood glucose.
Because the HbA1c test measures blood sugar, if anyone is having higher blood sugar levels in the days leading up to the HbA1c test, this will have a more significant impact on the test result than the glucose levels 2 to 3 months before the test.
Individuals may need an HbA1c test if they have symptoms of diabetes. Symptoms include:
Many health care providers may also order an HbA1c test if anyone is at higher risk for getting diabetes. Risk factors include:
A healthcare professional or technician will collect a blood sample from a vein in the arm using a needle. After the needle is inserted in the vein, a small amount of blood will be taken into a test tube or vial. An individual may feel a little sting when the needle goes in or out. The process usually takes less than five minutes.
There is no need for any special preparations for an HbA1c test.
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