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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. It helps track how your body responds to food, activity, and other factors affecting glucose levels.

Quick summary

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

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

Key facts at a glance

LOINC
48125-9
Short code
GH 15M pre Ins IV SerPl-aCnc
Synonyms
GH 15M pre Ins IV SerPl-aCnc
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 doctor 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 medications like insulin or oral diabetes drugs are working.

How the Test Works

Blood samples are collected at scheduled intervals (typically every 4–6 hours) over 24 hours. Glucose levels are measured in the serum portion of your blood using a specialized immunoassay method.

What to Expect Before the Test

No special preparation is needed, but you may be asked to follow a standard diet and avoid certain medications that could affect glucose levels. Wear comfortable clothing for blood draws.

What the Results Mean

Results show your glucose levels at each time point, helping identify patterns like spikes after meals or low levels during certain times. Your doctor will compare these to your symptoms and other health factors.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Glucose Monitoring in Diabetes and Metabolic Health

Short name

24-Hour Serum Glucose Monitoring

Frequently asked questions

How often should I expect blood draws during this test?
Blood samples are usually taken every 4 to 6 hours, depending on your doctor’s protocol. You may receive reminders or instructions on timing.
Will I feel different after the blood draws?
You may experience mild discomfort or bruising at the injection site, but the procedure is quick. Most people feel fine afterward.
Can I eat or drink anything before or during the test?
Yes, you can eat and drink normally unless your doctor specifies otherwise. This test focuses on natural glucose fluctuations, so avoiding restrictions is important.
  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