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Glucose in Serum (24-hour Profile)

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

This test measures your blood glucose levels over a 24-hour period using samples collected from your serum. It helps assess how your body manages blood sugar throughout the day.

Quick summary

["Understanding your blood sugar control over time can help identify patterns or conditions like diabetes."]

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

Key facts at a glance

LOINC
46739-9
Short code
GA 1 DBS-Imp
Synonyms
GA 1 DBS-Imp
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 Is Done

Your healthcare provider may order this test if they suspect you have diabetes, prediabetes, or another condition affecting blood sugar regulation. It can also help monitor existing conditions or guide treatment plans for managing glucose levels.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a portion of the 24-hour period (often overnight) to ensure accurate results. Bring a diary to track your food, fluids, and activities during the test.

What Happens During the Test

Blood samples are collected at specific times (often including before meals and after meals) from a vein in your arm. The samples are processed into serum and sent to the lab for glucose measurement.

What the Results Mean

Results provide a detailed picture of your blood glucose levels at different times. Abnormal patterns may indicate poor control of diabetes, insulin resistance, or other metabolic issues that need medical attention.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-Hour Serum Glucose Profile

Frequently asked questions

Will I need to fast before this test?
Yes, you may be instructed to fast for part of the 24-hour period, often overnight, to get accurate readings. Follow your healthcare provider’s instructions carefully.
How often will I have blood drawn during the test?
Blood will be drawn at several scheduled times, typically including before meals and after meals. The exact schedule depends on your test protocol, so check with your provider.
Can I eat or drink anything during the test?
You may be allowed limited fluids (like water) during fasting periods, but avoid food. Your provider will give specific guidelines to follow.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

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