Test Detail
Interpreting Results
Tests Included

Content created by

Written by
Dr. Betina Chandolia
BDS, MDS - Oral Pathology and Microbiology
Reviewed by
Dr. Ashish Ranjan
MBBS, MD (Pharmacology)
Want to know more?
Read our Editorial Policy

Diabetes Screening

Diabetes Screening Test Includes 2 testsView All
Diabetes Screening
You need to provide
This test is for
Male, Female
Test Preparation
  1. Do not eat or drink anything other than water for 8-12 hours before the test.


What is Diabetes Screening?

Diabetes screening test includes two sets of test: Glycosylated Hemoglobin test and Glucose - Fasting blood test. Generally, this test is advised to those patients who are at risk of diabetes. However, this test is highly recommended for people who are obese and have a previous history of diabetes or heart disease in their family. In addition, this test is used to monitor blood glucose levels in diabetic patients.

Why is Diabetes Screening done?

  • To screen for high blood sugar in presence of risk factors of diabetes

  • To screen for diabetes as a part of routine health checkup 

  • To monitor blood glucose levels in diabetic patients

  • To detect diabetes during pregnancy or gestational diabetes

  • To monitor treatment efficacy in patients undergoing treatment for diabetes

What does Diabetes Screening Measure?

Diabetic screening includes two set of tests - Glycosylated Hemoglobin test and Glucose - Fasting blood test. 

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 a protein found in Red Blood Cells and is responsible for transporting oxygen. There are different types of hemoglobin among which 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 normally 120 days. Higher the level of glucose in the blood, the greater the amount of it binding to Hemoglobin A. Hemoglobin A1c is the dominant form of Glycated Hemoglobin. As RBCs die and get replaced, Hemoglobin A1c is cleared and gets 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 that specific period of time. This not only helps in the diagnosis of Diabetes but also is useful for monitoring the effectiveness of measures taken to reduce blood sugar levels.

Glucose - Fasting Blood Test is done to measure the levels of glucose in blood during the period of fasting.

Glucose is the main source of energy for the body. Carbohydrates consumed in the diet are broken down in the body to form glucose, which is absorbed by the intestines and transported by the blood to various organs. The cells of these organs utilize the glucose to produce energy when required, and the excess is stored either as glycogen in the liver for short-term storage or in fat tissues as triglycerides for long-term storage. The uptake, utilization, and storage of glucose after it has been absorbed in the intestine is facilitated by a hormone called insulin. This hormone is secreted by the pancreas. Insulin influences the transport of glucose to the organs like heart, brain, working muscles, etc. It also directs the storage of excess glucose. These actions of insulin reduces sugar levels in the blood.

After a meal, sugar levels increase in blood, and insulin is secreted in response to reduce the sudden increase in sugar levels until it becomes normal. If in this process glucose levels fall too low in blood, another pancreatic hormone called glucagon is released. This hormone, directs the liver to convert stored glycogen into glucose and releases it into the blood. Both these hormones, insulin and glucagon, create a feedback mechanism to keep blood glucose levels within the normal range. Any imbalance in their activity causes an excess or shortage of blood sugar.

Glucose - Fasting blood Test helps to determine if the body is able to utilize or store glucose efficiently. High levels of sugar in blood indicate diabetes or resistance to insulin. Type 1 Diabetes is caused when insulin is not produced or produced in very little quantity. Type 2 Diabetes is caused when insulin is produced but is not being effectively utilized by the body. In both these cases, blood sugar levels rise, while cells remain deprived of nutrition.

Interpreting Diabetes Screening results


Glycosylated Hemoglobin:

Normal: Below 5.7% (39 mmol/mol approx.)

Prediabetic: 5.7% - 6.4% (39 to 46 mmol/mol approx.)

Diabetic: Above 6.5% (above 48 mmol/mol approx.)

Less than 5.7% Glycated Hemoglobin indicates normal levels of blood sugar. Increased risk of developing Diabetes is found in Prediabetic patients with blood sugar level between 5.7% and 6.4%. Patients with HbA1c level greater than 6.5% are usually diagnosed with Diabetes.

Glucose - Fasting Blood:

Normal fasting glucose range: 70 to 99 mg/dL (3.9 to 5.5mmol/L)

Prediabetes: 99 to 126 mg/dL (5.5 mmol/L to 7.0 mmol/L)

Diabetes: Higher than 126 mg/dL (7.0 mmol/L) in multiple subsequent tests

Tests Included (2 tests)

  • Glucose - Fasting
  • Glycosylated Hemoglobin


Thyrocare Technologies Limited is India's first and most advanced Totally Automated Laboratory having its strong presence in more than 2000 cities / towns in India and internationally. Thyrocare is India's first fully automated diagnostic laboratory with a focus on providing quality at affordable costs to laboratories and hospitals in India and other countries. Thyrocare operates with a Centralized Processing Laboratory (CPL) in Mumbai - India for esoteric tests; and Regional Processing...
Know More
User Reviews

Vivek Shukla
Very nice experience. Highly recommended.
Girish K Kulkarni
Awesome experience. Pathology test was never so easy.

Available at Other Labs


Orders Delivered
Get the link to download App

All products displayed on Tata 1mg are procured from verified and licensed pharmacies. All labs listed on the platform are accredited


Tata 1mg uses Secure Sockets Layer (SSL) 128-bit encryption and is Payment Card Industry Data Security Standard (PCI DSS) compliant


Find affordable medicine substitutes, save up to 50% on health products, up to 80% off on lab tests and free doctor consultations.

Know More About Tata 1mgdownArrow

Access medical and health information

Tata 1mg provides you with medical information which is curated, written and verified by experts, accurate and trustworthy. Our experts create high-quality content about medicines, diseases, lab investigations, Over-The-Counter (OTC) health products, Ayurvedic herbs/ingredients, and alternative remedies.

Order medicines online

Get free medicine home delivery in over 1800 cities across India. You can also order Ayurvedic, Homeopathic and other Over-The-Counter (OTC) health products. Your safety is our top priority. All products displayed on Tata 1mg are procured from verified and licensed pharmacies.

Book lab tests

Book any lab tests and preventive health packages from certified labs and get tested from the comfort of your home. Enjoy free home sample collection, view reports online and consult a doctor online for free.

Consult a doctor online

Got a health query? Consult doctors online from the comfort of your home for free. Chat privately with our registered medical specialists to connect directly with verified doctors. Your privacy is guaranteed.