Gestational diabetes screening

Pregnancy

Pregnancy (commonly 24–28 weeks)Once per pregnancy (sometimes earlier and/or repeated based on risk)1–3 hours (protocol-dependent)

Gestational diabetes screening checks how your body handles sugar during pregnancy and helps reduce complications.

Guidance for your location

Location

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Recommended Age

Pregnancy (commonly 24–28 weeks)

Frequency

Once per pregnancy (sometimes earlier and/or repeated based on risk)

Duration

1–3 hours (protocol-dependent)

Overview

Gestational diabetes (GDM) can develop during pregnancy and may increase risks for both the pregnant person and the baby. Screening usually involves a glucose drink and one or more blood tests. Timing and protocol vary by clinic and province, and earlier testing may be recommended if you have risk factors or prior GDM.

Who Should Get This Screening

Most pregnant people, commonly screened around 24–28 weeks (timing varies).
Earlier testing may be done if there are risk factors or a history of GDM.
If diagnosed, treatment and monitoring can reduce risks during pregnancy and delivery.

What to Expect

You drink a glucose solution and have blood drawn at one or more time points (protocol depends on your clinic). Some clinics use a screening test first and a confirmatory test if abnormal.

How to Prepare

Follow these tips to prepare for your screening

Follow clinic instructions; some tests require fasting, others do not.
Bring water and a snack for after the test (if allowed).
Let staff know if you feel nauseated or dizzy during the test.

Benefits

Identifies gestational diabetes so it can be managed.
Reduces pregnancy and newborn complications when treated.
Provides a plan for postpartum follow-up when needed.

Things to Consider

Glucose drink may cause nausea or lightheadedness.
False positives/negatives can occur; follow-up testing may be needed.
Minor discomfort or bruising from blood draws.

Guideline Source: Prenatal care

This information is provided for educational purposes only and should not replace professional medical advice. Always consult with your healthcare provider for personalized recommendations.