Glucose in Serum or Plasma (24-Hour Average)
This test measures the average blood glucose levels over a 24-hour period, helping assess long-term blood sugar control.
["This test helps track how well your body manages blood sugar over time, useful for diabetes management."]
Key facts at a glance
- LOINC
- 47750-5
- Short code
- GH 1.5h p Glc PO SerPl-aCnc
- Synonyms
- GH 1.5h p Glc PO SerPl-aCnc
- 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 Is This Test Done?
Your healthcare provider may order this test if you have diabetes or prediabetes to monitor how well your glucose levels are controlled with medication, diet, or lifestyle changes. It can also help detect subtle fluctuations that daily blood tests might miss.
How Is the Sample Collected?
A blood sample is drawn from a vein, usually in your arm. If you’re taking insulin or other diabetes medications, your provider may ask you to fast before the test to ensure accurate results.
What Does This Test Tell Us?
Unlike single-point blood glucose measurements, this test provides a snapshot of your average blood sugar levels over a full day. High or low averages may indicate poor glucose control, potential complications, or the need for adjustments in your treatment plan.
What Are Common Causes of Abnormal Results?
Results may be affected by recent illness, stress, physical activity, or changes in medication. If your results are outside expected ranges, your provider may investigate further to rule out conditions like kidney disease, hormonal imbalances, or other metabolic issues.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is primarily used in diabetes care to assess long-term glucose management. Elevated averages may signal uncontrolled diabetes, while consistently low averages could indicate hypoglycemia or other metabolic disorders. It’s not a standalone diagnostic test but supports overall health monitoring.
Short name
24-Hour Average Blood Glucose
Frequently asked questions
Why might my doctor ask for this test instead of a regular blood glucose check?
What should I do if my 24-hour average blood glucose is higher than expected?
Can I eat or drink before this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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