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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 assess how your body manages glucose, especially important for those with diabetes or metabolic concerns.

Quick summary

["This test provides a full picture of your blood sugar control over time, not just a single snapshot."]

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

Key facts at a glance

LOINC
33545-5
Short code
GA from BD.Jeanty82
Synonyms
GA from BD.Jeanty82
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-bd-jeanty
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 Matters

A 24-hour glucose profile is used to evaluate how your body responds to food, medication, or other factors affecting blood sugar. It can reveal patterns like spikes or drops that a single blood test might miss.

How the Test Works

Blood samples are collected at multiple time points (typically every few hours) and analyzed for glucose concentration. The results are plotted to show trends over the day.

What to Expect Before the Test

You may need to follow a specific diet or fasting instructions, depending on the test protocol. Your healthcare provider will guide you. Avoid alcohol or strenuous activity before testing.

Common Reasons for This Test

Doctors order this test to diagnose diabetes, check for undiagnosed glucose issues, monitor treatment effectiveness, or investigate symptoms like frequent urination, extreme thirst, or fatigue.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

How long will the results take to come back?
Results typically take 1–3 business days, depending on your lab. Your doctor will review them with you during a follow-up visit to discuss findings and next steps.
Can I eat or drink anything before the blood draws?
Follow your doctor’s instructions carefully. Some tests require fasting, while others may allow light snacks. Avoid caffeine or sugary drinks unless approved.
What if my glucose levels are consistently high or low?
High or low readings may signal diabetes, prediabetes, or other metabolic conditions. Your doctor will help interpret the results and recommend lifestyle changes, medications, or further testing as needed.
  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