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Glucose in maternal serum/plasma during pregnancy (24-hour profile)

Published: August 9, 2026Updated: August 16, 2026

This test measures blood glucose levels over a 24-hour period in your blood taken from your maternal serum or plasma during pregnancy. It helps track how your body manages glucose, especially important for managing gestational diabetes.

Quick summary

["A 24-hour glucose profile helps assess how your body responds to glucose during pregnancy."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
47776-0
Short code
GH Pre Glc PO SerPl-aCnc
Synonyms
GH Pre Glc PO SerPl-aCnc
Category
glucose
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
true
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms of gestational diabetes, such as increased thirst, frequent urination, or unexplained fatigue. It may also be recommended during routine prenatal care for high-risk pregnancies or if you have risk factors like obesity, family history of diabetes, or previous gestational diabetes.

How Is the Test Performed?

Blood samples are collected from your arm over a 24-hour period, typically at set intervals (e.g., every 2–4 hours). The samples are tested for glucose concentration using a method like enzymatic analysis. You may be asked to follow a specific diet or activity plan before or during testing to ensure accurate results.

What Do the Results Mean?

Results are interpreted by your healthcare provider based on your individual needs and pregnancy status. Abnormal results may indicate how your body handles glucose, which can inform treatment decisions, such as diet changes, exercise, or medication.

What Are Common Risks or Side Effects?

The most common side effect is mild discomfort or bruising at the needle insertion site. There are no significant risks associated with this test, but ensure you follow your provider’s instructions for proper sample collection to avoid contamination or errors.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Pregnancy glucose monitoring (serum/plasma)

Frequently asked questions

What does a 24-hour glucose profile test for?
This test measures how your body responds to glucose over time, helping identify patterns in blood sugar levels that may indicate gestational diabetes or other metabolic concerns.
How often is this test done during pregnancy?
The frequency depends on your risk factors and healthcare provider’s recommendations. Some women may need it once, while others may have multiple tests throughout pregnancy.
Can I eat or drink before this test?
Follow your provider’s instructions carefully. Typically, you may need to fast or maintain a specific diet for the first few hours of testing, but always confirm with your healthcare team.
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This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy