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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, helping track how your body manages sugar after eating and at rest.

Quick summary

["Assesses how your body handles blood sugar throughout the day."]

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

Key facts at a glance

LOINC
33287-4
Short code
G6PD DBS Ql
Synonyms
G6PD DBS Ql
Category
glucose
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
true
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 doctor may recommend this test if you have diabetes, prediabetes, or symptoms like frequent urination, extreme thirst, or unexplained weight changes. It’s also used to check how well medications like insulin are working or to evaluate conditions affecting blood sugar control, such as liver or kidney disease.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample from a vein in your arm, typically done in a lab setting. If you’re fasting, follow your doctor’s instructions, as fasting glucose measurements may be part of the profile.

How the Test Results Are Used

Results help identify patterns in your blood sugar levels, such as spikes after meals or low levels at night. This information guides treatment plans, including diet, exercise, or medication adjustments to improve overall glucose management.

Common Causes of Abnormal Results

Elevated glucose levels may indicate diabetes, poor insulin function, or conditions like pancreatitis or dehydration. Low levels could signal hypoglycemia, excessive insulin use, or certain medications.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test provides a comprehensive overview of blood sugar fluctuations, aiding in the diagnosis, monitoring, and management of metabolic disorders. It’s particularly useful for patients with diabetes or those at risk of developing it, as it reveals how glucose is processed over time rather than just at one point in time.

Short name

24-Hour Serum Glucose Monitoring

Frequently asked questions

Will I need to fast for this test?
Sometimes yes. If your doctor orders a fasting sample, you’ll need to avoid food and drink (except water) for a set period before the test. Always follow their instructions to ensure accurate results.
How long will I need to wait for my results?
Results are typically available within a few days to a week, depending on your lab’s processing time. Your doctor will contact you once they’re ready to discuss them.
Can I eat or drink anything before the blood draw?
If fasting is required, avoid food and liquids (except water) for the specified time. If no fasting is needed, you can eat and drink normally, but avoid sugary foods or drinks that might affect glucose levels.
  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