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Glycosylated Hemoglobin

Glycosylated Hemoglobin

Also referred as
Hemoglobin A1C
For men & women
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A glycosylated Hemoglobin (HbA1c) is a lab test to measure how much sugar has been in your blood over the past 2-3 months. It is used to detect prediabetes, diagnose diabetes as a part of health checkups, and monitor treatment efficacy. HbA1c values are considered normal if <5.7%, while values ≥ 6.5% are indicative of diabetes.

The higher the HbA1c, the greater the risk of complications. People having diabetes should take this test regularly to monitor their glucose levels and regulate the treatment decision. A proper schedule of exercise, healthy eating, and medication can assist in bringing down the level.

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Understanding Glycosylated Hemoglobin

Diabetes is a chronic disease that affects the body's processing of blood sugar, thereby increasing blood sugar levels. Some  individuals might not ever experience signs and symptoms of this condition, while the common signs and symptoms will include the following:

  • Being thirsty often

  • Urination in excess

  • Blurring of vision

  • Weakness

  • Slow healing of wounds, etc.

Hemoglobin is a protein found in red blood cells that transports oxygen into various parts of the body. When glucose (sugar) molecules in the bloodstream attach to hemoglobin, a process called glycation takes place, which essentially forms glycosylated hemoglobin, or HbA1c.

An HbA1c (Glycosylated Hemoglobin) test gives an overall picture of your long-term blood sugar control. Thus, it is an important test for screening and diagnosing prediabetes and diabetes. Once an individual is diagnosed, it helps in monitoring the control of the disease, so that they can undergo timely interventions to prevent or delay the onset of complications such as nerve damage, kidney disease, and vision problems.

 

The American Diabetes Association (ADA) recommends keeping HbA1c levels below 7% to prevent the development of complications. Different goals may be set for specific individuals depending on age, duration of diabetes, and any other medical conditions present.

No special preparations are required for this test. Eat and drink as per your routine. However, inform your doctor about all the current medications or any underlying health conditions to ensure accurate interpretation of your test results.

Test result ranges may vary across the laboratories depending on the methodology and laboratory guidelines. Do not self-medicate; always consult your doctor to understand your test results correctly.

Lifestyle Tips to Manage Your HbA1c Levels: 

🥤Hydration: Stay hydrated! Drinking enough water supports overall health and helps maintain stable blood sugar levels. 

🍲Eat (Diet): Focus on a balanced diet rich in fiber, lean proteins, and healthy fats. Include whole grains, vegetables, nuts, and seeds to help manage blood sugar.

🧘Activity (Exercise): Regular physical activity like walking, cycling, or strength training can improve insulin sensitivity and glucose control.

😴Lifestyle (Sleep): Prioritize quality sleep, as poor sleep can affect blood sugar levels and insulin response

👩‍⚕️Talk to Your Doctor (Consult): Regularly consult your doctor to understand your HbA1c results and adjust your diabetes management plan if needed

💊Habits (Supplements): Consider supplements like magnesium, chromium, etc. (if your doctor advises) to support healthy blood sugar levels. 

Relation between HbA1c Test and different types of diabetes:

 

 

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What does Glycosylated Hemoglobin measure?

Glycosylated Hemoglobin Test measures the percentage of glycosylated hemoglobin in blood which reflects the average blood glucose over a period of past two to three months (8 - 12 weeks).

Hemoglobin is the protein found in Red Blood Cells and is responsible for transporting oxygen. Of the different types of hemoglobin, Hemoglobin A is predominant. With the elevation of blood sugar levels, some glucose binds spontaneously to Hemoglobin A (this binding is called Glycosylation or Glycation) and remains bound for the complete lifetime of the RBC, which is 120 days normally. Higher the level of glucose in the blood, greater is the amount of it binding to Hemoglobin A. Hemoglobin A1c is the dominant form of Glycated Hemoglobin. As RBCs die and are replaced, Hemoglobin A1c is cleared and slowly replaced with non-glycosylated hemoglobin. Measurement of HbA1c level over a period of time gives an indication of the level of glucose in the blood over the specified period of time. This helps in the diagnosis of Diabetes and is useful for monitoring the effectiveness of measures taken to reduce blood sugar levels.

FAQs related to Glycosylated Hemoglobin

Symptoms of Hypoglycemia include: Excessive sweating, frequent hunger, shivering or trembling, confusion and blurring of vision
Diabetes can be caused by various reasons. The most common risk factors for diabetes include being obese or overweight with low physical activity, having a blood relative diagnosed with Diabetes, or having been diagnosed with hypertension. Other reasons which can cause diabetes could be low High-Density Lipoproteins or high triglyceride levels, being diagnosed with Polycystic Ovarian Syndrome, or having been diagnosed with gestational diabetes and cardiovascular diseases.
Inform the doctor about the medications you may be taking. No other specific preparations are usually required before this test.
Yes, blood sugar levels can be increased by certain medications, during pregnancy, and even temporarily due to stress.
False results can appear in patients of hemolysis, anemia, and Iron deficiency. False results may also appear in patients who have undergone blood transfusion recently.
The HbA1c Test cannot determine acute changes in blood glucose levels that trigger a glucose shock. It also cannot determine any recent change in blood glucose level. The test is also insufficient to determine elevated blood sugar levels in people with variant hemoglobin like Hemoglobin S or Sickle Cell Hemoglobin since they have lower amount of Hemoglobin A in their blood.
Diabetes causes an increase in blood sugar levels. Increased sugar levels, if not controlled, can cause severe damage to the muscles and nerves. This may give rise to a number of complications over a period of time. Some common complications of uncontrolled diabetes include heart diseases like coronary artery disease, heart attack, diabetic retinopathy (damage to the retina) which may cause blindness, diabetic neuropathy (damage to the nerves) at various parts of the body. It may also cause diabetic nephropathy (damage to the kidneys) resulting in chronic loss of kidney function and diabetic foot which can cause foot ulcers that may turn gangrenous. Apart from these, uncontrolled diabetes may also lead to other severe conditions like hearing impairment, a number of skin conditions, and may even lead to death.
Additional tests that may be prescribed to diagnose diabetes in case of abnormal results are: Urine Glucose Test, Blood Glucose - Post prandial (PP), Random Blood Glucose Test, Fasting Blood Glucose Test and Oral Glucose Tolerance Test.
HbA1c measurement gives an average of blood sugar value for past 3 months. The average blood glucose value (ABG) is a calculated parameter from the reported HbA1c value. If HbA1c is same for two people then ABG will automatically be the same.
The blood glucose tests are performed to directly measure the concentration of glucose in your blood at the time of testing (single point in time). The HbA1c test indicates the trend of your blood glucose levels over a period of time (8-12 weeks), similar to an average, by measuring the percentage of glycated hemoglobin persisting in blood.
Lowered HbA1c level is an indication of sustained lowered or reduced blood glucose levels over a period of time. Long term reduced blood glucose levels in diabetic patients successfully prevents future complications of diabetes, including kidney complications, nerve damage, damage to the retina, cardiovascular diseases, and diabetic foot among others. Research has shown that a reduction of just about 1% in HbA1c level reduces the risk of death due to cardiovascular diseases by 45%.
The healthcare provider takes a blood sample from the arm. The site from where the blood is to be withdrawn is cleaned with a swab of rubbing alcohol. This is then followed by inserting a small needle which has a tube attached to it for collecting blood. Once the sufficient blood for analysis is withdrawn, the needle is removed. The site is then covered with a gauze pad.
As such there is no risk but in few cases, bruising, bleeding, and infection at the puncture site can be seen. In very few cases, there can be swelling of the vein after the blood is withdrawn.
Hyperglycemia refers to a condition where the blood glucose level is above the normal range. This condition may indicate prediabetes or diabetes and may cause significant health problems.
Symptoms of Hyperglycemia include: Increased thirst, frequent urge to urinate, weakness, tiredness (fatigue), blurring of vision and slow wound healing.
Hypoglycemia is the condition where the blood sugar levels fall below normal. This is commonly found in case of nutritional deficiency.
Content created by
Written by:
Dr. Lipika Khurana
BDS, PGDHHM
Reviewed by:
Dr. Swati Gupta (Anand)
MBBS, MD Lab Medicine
Want to know moreRead our editorial policy
Last Updated9th Feb 2026

Glycosylated Hemoglobin test price for other cities

Price inAhmedabadRs. 399
Price inAllahabadRs. 399
Price inBangaloreRs. 399
Price inBhopalRs. 399
Price inChandigarhRs. 399

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Glycosylated Hemoglobin