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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 a sample of your serum.

Quick summary

["Understanding your glucose levels throughout the day helps identify patterns in blood sugar control."]

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

Key facts at a glance

LOINC
33106-6
Short code
GA from GSD.Hansmann82
Synonyms
GA from GSD.Hansmann82
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
us-estimated-from-gsd-hansmann
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 to assess how well your body manages blood sugar, especially if you have or are at risk for diabetes, prediabetes, or other conditions affecting glucose metabolism. It can also help evaluate how medications or lifestyle changes impact your blood sugar over time.

What to Expect Before the Test

No special preparation is typically needed, but you may be asked to fast for a portion of the 24-hour period (often overnight) to ensure accurate results. Bring any medications you’re currently taking to your appointment.

During the Test

A healthcare professional will draw blood from a vein in your arm at scheduled intervals (often every few hours) to collect serum samples. These samples are then analyzed to measure glucose concentration at each time point.

What the Results Mean

The results provide a detailed profile of your glucose levels throughout the day, helping identify patterns such as spikes, low points, or consistency. This information can help diagnose conditions like diabetes, assess treatment effectiveness, or guide dietary or medication adjustments.

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 me about my health?
It provides a comprehensive picture of how your blood sugar fluctuates throughout the day, which can reveal patterns that standard single-point tests might miss. This can help determine if you have diabetes, prediabetes, or other metabolic issues that require attention.
How often will I need to provide blood samples during the test?
Blood samples are usually collected at multiple intervals (e.g., every 2–4 hours) over the 24-hour period. Your provider will outline the exact schedule with you before the test.
Can I eat or drink anything during the 24-hour test?
Some tests may require fasting for part of the period, but others may allow small amounts of food or fluids unless instructed otherwise. Always follow your provider’s specific guidelines to ensure accurate results.
  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