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Glucose in Serum or Plasma (24-Hour Average)

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

This test measures the average blood glucose levels over a 24-hour period using a sample of your blood, either serum or plasma. It helps assess long-term blood sugar control.

Quick summary

["This test provides insight into how consistently your blood sugar stays within healthy ranges over time."]

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

Key facts at a glance

LOINC
47903-0
Short code
GH 2h p Gc SerPl-aCnc
Synonyms
GH 2h p Gc SerPl-aCnc
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 Matters for Your Health

Unlike a single blood glucose check, this test reflects your body’s glucose management over a full day. It’s particularly useful for people with diabetes to track trends and adjust treatments effectively.

How the Test Works

Your blood sample is analyzed to determine the average glucose concentration. This method often involves advanced techniques like continuous glucose monitoring data integration or specialized lab processing to estimate daily fluctuations.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for a standard blood draw. If this is a 24-hour average test, your healthcare provider may guide you on timing your sample collection around your usual activities.

Common Reasons for This Test

Doctors may order this test to evaluate diabetes management, screen for prediabetes, or monitor complications like neuropathy or retinopathy. It’s also useful for assessing how well medications like insulin or oral hypoglycemic agents are working.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-Hour Average Blood Glucose

Frequently asked questions

What does a normal result mean for me?
A normal result suggests your blood glucose levels are generally stable and within a healthy range over 24 hours. However, your specific target range may depend on your overall health, medications, and whether you have diabetes or another condition. Always discuss your results with your healthcare provider.
How often should I get this test?
Your healthcare provider will determine how frequently you need this test based on your medical history, current health status, and treatment plan. Regular monitoring is especially important if you have diabetes or are at risk for blood sugar-related complications.
Can lifestyle changes affect this test result?
Yes, lifestyle factors like diet, physical activity, stress, and sleep can influence your blood glucose levels. Making healthy choices—such as eating balanced meals, staying active, and managing stress—can help improve your test results over 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