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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, helping doctors assess how your body manages glucose.

Quick summary

["Understanding your body’s glucose balance over time can help identify diabetes or other metabolic conditions."]

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

Key facts at a glance

LOINC
27850-7
Short code
GH 10M p chal SerPl-mCnc
Synonyms
GH 10M p chal 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 Is Done

Your healthcare provider may order this test if you have symptoms like frequent urination, excessive thirst, fatigue, or unexplained weight changes. It’s also used to monitor diabetes management, especially in people with insulin resistance or recent changes in treatment.

How the Test Works

A blood sample is drawn, and glucose levels are measured in serum over a 24-hour period. This provides a clearer picture than a single blood test, as it accounts for natural fluctuations in glucose due to meals, activity, or other factors.

What to Expect Before the Test

No special preparation is needed, but you may be asked to track your food, activity, or insulin doses during the 24-hour period to ensure accurate results. Avoid skipping meals or altering your routine unless instructed.

What the Results Mean

Results are typically reported as a range of glucose concentrations measured at different times. High values may indicate diabetes or poor glucose control, while low values could signal hypoglycemia or other metabolic issues.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How does a 24-hour glucose profile differ from a standard blood sugar test?
A standard blood sugar test measures glucose at one point in time, while a 24-hour profile captures natural fluctuations, helping detect patterns like reactive hypoglycemia or insulin resistance that a single test might miss.
What should I do if my glucose levels are consistently high or low?
Consult your healthcare provider to discuss lifestyle changes, diet adjustments, or medication adjustments. High levels may require diabetes management strategies, while low levels may need monitoring for symptoms like shakiness or dizziness.
Can I drink fluids before or during the test?
Yes, but avoid excessive caffeine or sugary drinks, as they can affect results. Stick to your usual hydration unless instructed otherwise.
  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