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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 to help assess how your body manages glucose, often used to evaluate diabetes or insulin sensitivity.

Quick summary

["This test helps track how your body responds to glucose throughout the day."]

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

Key facts at a glance

LOINC
79594-8
Short code
Gly-pro/Creat Ur-sRto
Synonyms
Gly-pro/Creat Ur-sRto
Category
glucose
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your doctor may order this test if you have symptoms of diabetes, such as excessive thirst, frequent urination, or unexplained weight changes. It’s also used to monitor long-term glucose control in people with diabetes or those at risk for metabolic disorders.

What to Expect Before the Test

You’ll typically fast overnight before this test. Some labs may ask you to collect urine samples over 24 hours, starting after an overnight fast. Follow your healthcare provider’s specific instructions carefully.

How the Test Works

Blood or urine samples are collected at different times during the day. Blood samples are usually taken from a vein in your arm, while urine samples are collected in a container over the 24-hour period. The test measures glucose levels in both samples to create a profile of your glucose metabolism.

What the Results Mean

Results are interpreted by your healthcare provider based on your medical history and symptoms. Elevated or fluctuating glucose levels may indicate diabetes or other metabolic conditions requiring further evaluation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

What causes false high or low glucose readings in this test?
False results can occur if you didn’t follow fasting instructions, missed urine collection times, or had dietary changes during the 24-hour period. Always confirm lab protocols with your provider.
How often should I get this test?
Frequency depends on your health status. People with diabetes usually get this test every few months to monitor glucose control. Your doctor will determine the best schedule for you.
Can I eat or drink anything before the urine collection period?
No, you must follow a strict fasting period before urine collection begins. Avoid caffeine, alcohol, or sugary foods/drinks unless instructed otherwise.
  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