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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 serum samples, helping assess how your body manages glucose over time.

Quick summary

["Understanding your glucose levels throughout the day helps identify patterns in blood sugar control."]

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

Key facts at a glance

LOINC
79201-0
Short code
GH 30M p Arg+Ins SerPl-mCnc
Synonyms
GH 30M p Arg+Ins SerPl-mCnc
Category
hormone
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 in people with diabetes to check how well their glucose levels are controlled over time.

What to Expect Before the Test

No special preparation is needed, but you may be asked to fast for a portion of the 24-hour period (often overnight) to ensure accurate results. Bring any medications you’re taking to discuss with your provider.

How the Test Is Performed

Blood samples will be collected at multiple times during the 24-hour period. Typically, samples are taken in the morning and evening, with some tests requiring fasting before collection. The serum portion of your blood is analyzed to measure glucose concentration.

What the Results Mean

Results help determine if your glucose levels are consistently high or low, which can indicate diabetes, insulin resistance, or other metabolic conditions. Your provider will compare these results to your symptoms and other health factors to make a diagnosis or treatment plan.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How often should I get this test?
What if I miss a blood draw?
Does fasting affect this test?
Can I take my diabetes medication before the test?
Yes, but discuss it with your provider beforehand. Some medications may need adjustment, and skipping doses could impact your glucose readings. Never stop taking your medication without medical advice.
High or low glucose levels over 24 hours may signal diabetes, hypoglycemia, or other conditions. Your provider will work with you to adjust treatments, such as diet, exercise, or medication, to stabilize your levels. Lifestyle changes and regular monitoring are key.
  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