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What is a GCT:75gms GLUCOSE CHALLENGE TEST?

GCT: 75 gms Glucose Challenge Test is a blood test that evaluates how the body processes glucose after drinking a solution containing 75 grams of glucose. It is commonly performed during pregnancy to screen for gestational diabetes, a condition that can affect the health of both mother and baby. The test may also help assess impaired glucose tolerance or diabetes in non-pregnant individuals.

Additional Information

Also known as/ Other names: 75g Glucose Challenge Test, 75 Gram Oral Glucose Test, 75g Glucose Screening Test, Gestational Glucose Challenge Test (75g)
Parameters: 1
Recommended for: M/F/Others
Sample Type: Blood & Urine
Patient Preparation: Draw fasting sample and 2 hours after oral glucose monohydrate (equivalent to 75 gm anhydrous glucose.). Ship refrigerated or frozen. Terminate the test procedure in case the patient vomits during any step of test procedure.
Reports: Same Day

FAQs

What happens after an abnormal 75 g GCT?

Your healthcare professional may recommend dietary changes, home glucose monitoring, referral to a dietitian or diabetes educator, and possibly medication (e.g., insulin or metformin). Follow-up testing after pregnancy is also important because of higher future type 2 diabetes risk.

Are there any special considerations for people with certain conditions?

Patients with known diabetes, cystic fibrosis–related diabetes screening, or other metabolic issues may follow modified protocols. The test is generally avoided or carefully managed if you already have uncontrolled diabetes. Always disclose your full medical history.

What if I cannot finish the glucose drink?

Inform the staff right away. Incomplete intake usually invalidates the test, and it will need to be repeated on another day.

Can medications or illness affect the results?

Yes. Certain medicines (e.g., steroids, some diuretics), acute illness, infection, or recent surgery can alter results. Tell your doctor about everything you are taking and any recent health issues.

Is the 75 g GCT the same as the oral glucose tolerance test (OGTT)?

Not exactly. The full diagnostic OGTT is usually a fasting test with blood draws at fasting, 1 hour, and/or 2 hours after 75 g glucose. The “GCT” label often implies a simpler screening version. Terminology and exact protocols differ by country/clinic.

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