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Glucose in Serum (24-hour profile)

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

This test measures your blood sugar levels over a 24-hour period using a sample of your serum. It helps assess how your body manages glucose over time, often used in diagnosing or monitoring conditions like diabetes.

Quick summary

["This test tracks your blood sugar naturally, not just at one time point."]

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

Key facts at a glance

LOINC
68940-6
Short code
GH 90M p Exc SerPl-mCnc
Synonyms
GH 90M p Exc SerPl-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
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 This Test Matters

A 24-hour glucose profile provides a comprehensive picture of your body’s ability to regulate blood sugar. Unlike single-point measurements, it reveals patterns—such as spikes or drops—that might not be obvious from a single blood test. This can help doctors identify whether your glucose levels are consistently stable or if there are hidden issues, like insulin resistance or reactive hypoglycemia.

How It Works

Your serum sample is analyzed using a specialized method to measure glucose concentration at multiple intervals over 24 hours. The test may involve collecting blood at different times (e.g., fasting and post-meal) or using continuous monitoring techniques, depending on clinical protocols.

Preparation and Process

You may need to follow specific instructions, such as fasting for a portion of the day or avoiding certain foods/drinks. Your doctor will guide you on timing and sample collection. The test may require multiple blood draws or a specialized device for continuous monitoring, depending on the method used.

Common Uses

This test is typically used to diagnose or monitor diabetes, prediabetes, or other metabolic conditions. It can also help evaluate how well medications (like insulin or oral hypoglycemic drugs) are working or identify hidden glucose-related issues in people without obvious symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

What does a 24-hour glucose profile tell your doctor?
It helps detect patterns in your blood sugar that single tests might miss. For example, it can reveal whether you experience reactive hypoglycemia (low blood sugar after meals) or if your glucose levels are consistently high or low, guiding treatment decisions.
How long does it take to get results?
Results may take several days to weeks, depending on the lab’s processing time and whether additional testing (like oral glucose tolerance tests) is needed. Your doctor will discuss timelines with you before the test.
Can I eat or drink anything before this test?
Yes, but follow your doctor’s instructions carefully. Some tests require fasting for part of the day, while others may allow certain foods or fluids. Avoid caffeine or sugary drinks unless permitted.
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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