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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 collected at specific times to assess how your body manages glucose throughout the day.

Quick summary

["Helps identify patterns in blood sugar control, useful for diabetes management and detecting hidden glucose fluctuations."]

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

Key facts at a glance

LOINC
11937-0
Short code
GA from HL.Merz.87
Synonyms
GA from HL.Merz.87
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
us-estimated-from-hl-merz
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 or are at risk of developing it, to check for consistent blood sugar control. It can also help detect conditions like hypoglycemia (low blood sugar) or hyperglycemia (high blood sugar) that may not be obvious from a single blood test.

How the Test Works

Blood samples are drawn at set intervals (often including fasting and post-meal times) to measure glucose concentration in your serum. The results help create a profile of your glucose levels 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 day if samples are taken before meals. Wear comfortable clothing and plan to stay near the testing site for the duration of the collection period.

During the Test

A healthcare professional will insert a small needle into your arm to draw blood at each scheduled time. You may feel a brief pinch, but the process is quick. You can sit or lie down during the procedure.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

24-Hour Serum Glucose Profile

Frequently asked questions

How often should I have this test if I have diabetes?
If you have diabetes, your provider may recommend this test every few months or annually, depending on your blood sugar goals and overall health. Follow their specific guidance for scheduling.
What does a normal glucose profile look like?
A normal profile typically shows stable glucose levels without extreme peaks or drops. Your results will be compared to your baseline and clinical context rather than a single numeric range, as individual needs vary.
Can I eat or drink anything before the blood draws?
If fasting samples are required, avoid food and liquids (except water) for a specified period before the first draw. Otherwise, follow your provider’s instructions for timing around meals.
  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