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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 throughout the day.

Quick summary

["Understanding how your blood sugar fluctuates can help identify patterns or conditions like diabetes or metabolic issues."]

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

Key facts at a glance

LOINC
56499-7
Short code
GH 45M p chal SerPl-mCnc
Synonyms
GH 45M 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 of diabetes, such as frequent urination, excessive thirst, or unexplained weight changes. It could also be used to monitor blood sugar control in people with known diabetes or other metabolic disorders.

What to Expect Before the Test

No special preparation is needed for this test. You may have a blood sample drawn from a vein in your arm, typically during a routine office visit or lab visit. If you’re taking medications that affect blood sugar, let your provider know.

What the Results Mean

The results provide a detailed picture of your glucose levels at different times of the day, which can help detect abnormalities like hyperglycemia (high blood sugar) or hypoglycemia (low blood sugar). This information is critical for tailoring treatment plans.

Common Conditions Monitored

This test is often used to diagnose or manage diabetes, prediabetes, or conditions affecting glucose metabolism. It may also help evaluate how well medications or lifestyle changes are working to control blood sugar levels.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Glucose Monitoring in Diabetes and Metabolism

Short name

24-Hour Serum Glucose Monitoring

Frequently asked questions

How often will I need this test?
The frequency depends on your health condition. People with diagnosed diabetes may need this test more regularly, such as every few months, while others may only need it once a year or less, depending on their treatment plan and provider’s recommendations.
What does a normal result mean for my health?
A normal 24-hour glucose profile typically shows consistent blood sugar levels without extreme spikes or drops. If your results are within expected patterns, it suggests your body handles glucose well. However, your provider will interpret results in the context of your overall health and medical history.
Can I eat or drink before the test?
You may drink water but should avoid eating or consuming sugary foods or beverages for at least 8 hours before the test to ensure accurate results. Follow your healthcare provider’s specific instructions if you have any dietary restrictions or concerns.
  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