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Glucose in Serum (24-hour Profile)

Published: August 9, 2026Updated: August 17, 2026

This test measures your blood glucose levels over a 24-hour period using a sample of your serum. It helps track how your body responds to food, activity, and other factors over time.

Quick summary

["Understanding your glucose trends can help manage diabetes or other conditions affecting blood sugar levels."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
40300-6
Short code
GH 1.5h p CLN SerPl-mCnc
Synonyms
GH 1.5h p CLN SerPl-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
0
Ref high
17
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 diabetes, prediabetes, or symptoms like frequent urination, excessive thirst, or unexplained weight changes. It may also be used to assess how well your current treatment plan is working or to evaluate metabolic health in certain conditions.

How the Test Works

A blood sample is collected from a vein in your arm, typically in the morning after fasting. The serum portion of your blood is then analyzed to measure glucose concentrations at multiple time points over 24 hours. This helps create a detailed profile of your glucose levels throughout the day.

What to Expect Before the Test

For the most accurate results, you may need to fast overnight before the test. Follow your provider’s instructions carefully regarding food, drink, and activity. If you take diabetes medications, ask your provider how to prepare.

What the Results Mean

The results provide a snapshot of your glucose levels at various times, showing patterns like peaks after meals or low points during sleep. While specific ranges aren’t provided here, these patterns help identify whether your glucose stays within healthy limits or requires adjustments to your treatment.

Reference range

NCBI: NSE 0-17 ng/mLN/A

Specimen: serum

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-Hour Glucose Monitoring

Frequently asked questions

How often will I need this test?
The frequency depends on your health condition. People with diabetes may need this test every few months or annually, while others with metabolic concerns might need it less often. Your healthcare provider will determine the schedule based on your individual needs.
What does a normal result mean?
A normal result doesn’t provide specific numeric ranges here, but it means your glucose levels remain stable and predictable throughout the day without extreme highs or lows. This consistency is key for managing blood sugar effectively.
Can I eat or drink anything before the test?
Yes, but follow your provider’s instructions closely. Typically, you’ll need to fast overnight before the test, but some tests may allow small amounts of water. Always confirm with your healthcare team to avoid interfering with results.
  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 17, 2026. · Read our editorial policy