Skip to content

Glucose in Serum (24-Hour Profile)

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

This test measures your blood glucose levels over a 24-hour period using a sample of your serum. It helps assess how your body manages glucose, especially important for diagnosing or monitoring conditions like diabetes.

Quick summary

["This test tracks your blood sugar levels throughout the day to check how your body handles glucose."]

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

Key facts at a glance

LOINC
47769-5
Short code
GH 30M p Glc PO SerPl-aCnc
Synonyms
GH 30M 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 This Test Is Done

Your healthcare provider may order this test if you have symptoms of diabetes, such as frequent urination, extreme thirst, or unexplained weight changes. It’s also used to monitor blood sugar control in people with known diabetes or prediabetes, especially if they’re on treatment like insulin or oral medications.

How the Test Works

A blood sample is collected from a vein in your arm. The serum portion is analyzed to measure glucose concentration at different times (typically over 24 hours). The results help identify patterns in your blood sugar levels, such as spikes or low points.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast (not eat or drink) for a certain period before the blood draw, depending on your provider’s instructions. Wear comfortable clothing if you need to have blood drawn.

What the Results Mean

The results provide a detailed picture of your blood glucose trends. Abnormal patterns may indicate poor glucose control, which can affect how your body processes energy or may signal underlying conditions like diabetes.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

How often should I expect this test?
This test is typically done once or twice a year for people with diabetes to monitor their glucose control. If you don’t have diabetes but have risk factors (like obesity or a family history), your provider may recommend it less frequently or at different intervals.
What if my results are outside the normal range?
If your glucose levels are consistently high or low, it may signal an issue that needs attention. Your provider will discuss the results with you and may recommend changes to your diet, exercise, or medication to help balance your blood sugar.
Can I eat or drink anything before the blood draw?
Follow your provider’s instructions carefully. If fasting is required, avoid food and liquids (except water) for the specified period before the test to get accurate 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 16, 2026. · Read our editorial policy