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Glucose in Serum (24-hour Profile)

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

This test measures how much glucose (sugar) is present in your blood over a 24-hour period, typically collected via a serum sample.

Quick summary

["Understanding your blood sugar trends helps manage diabetes or identify patterns in glucose levels."]

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

Key facts at a glance

LOINC
11927-1
Short code
GA from GSD
Synonyms
GA from GSD
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
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 you have diabetes, are at risk for diabetes, or if you experience symptoms like frequent urination, excessive thirst, or unexplained weight changes. It can also help assess how well your body regulates blood sugar over time.

What to Expect Before the Test

No special preparation is needed for this test. You may be asked to fast for 8–12 hours before collection, but the 24-hour profile itself involves multiple blood draws at different times. Always follow your provider’s instructions.

How the Test Is Performed

Blood is drawn from a vein (usually in your arm) at scheduled intervals (e.g., morning, midday, evening) over 24 hours. The sample is processed into serum for glucose measurement.

What the Results Mean

Results show glucose levels at various times, helping identify patterns like spikes or drops. Abnormal findings may indicate poor blood sugar control, insulin resistance, or other metabolic issues.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How often should I get this test?
Your provider will determine the frequency based on your health needs. Typically, it’s done once or twice a year for stable patients or more often if you’re managing diabetes or have other risk factors.
What does a ‘normal’ result look like?
There’s no single ‘normal’ range for a 24-hour glucose profile—results are interpreted as patterns. For example, consistent high or low values may signal diabetes or other metabolic disorders.
Can I eat or drink before blood is drawn during the profile?
No, you should avoid food and liquids (except water) for 8–12 hours before the first draw. After that, follow your provider’s instructions for each blood collection time.
  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