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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 serum samples. It helps assess how your body manages glucose, especially important for diagnosing or monitoring conditions like diabetes.

Quick summary

["This test helps track how your body handles blood sugar throughout the day."]

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

Key facts at a glance

LOINC
49952-5
Short code
GH 3 AM SerPl-aCnc
Synonyms
GH 3 AM SerPl-aCnc
Category
chemistry
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 Is This Test Done?

Your healthcare provider may order this test if you have symptoms of diabetes, prediabetes, or other metabolic conditions. It’s also used to evaluate how well medications (like insulin) are controlling your blood sugar 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 (e.g., overnight) to ensure accurate results. Bring any medications you’re taking to discuss with your provider.

How the Test Works

Blood samples are collected at different times (e.g., fasting and post-meal) to measure glucose levels in serum. Results are analyzed to identify patterns, such as spikes or drops, that may indicate issues with glucose regulation.

What the Results Mean

Results show glucose trends over 24 hours, helping identify whether your body produces enough insulin, responds poorly to insulin, or has other metabolic challenges. Abnormal patterns may signal diabetes, hypoglycemia, or insulin resistance.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for diagnosing and managing diabetes and related metabolic disorders. It provides a comprehensive picture of glucose control, guiding treatment adjustments (e.g., diet, medication, or lifestyle changes) to improve long-term health.

Short name

24-Hour Serum Glucose Profile

Frequently asked questions

Will I Need to Fast Before the Test?
Sometimes yes—your provider may ask for fasting samples (e.g., overnight) to measure baseline glucose levels. Non-fasting samples may be taken at other times during the 24-hour period. Always follow your provider’s instructions.
How Long Will It Take to Get Results?
Results are typically available within a few days to a week, depending on lab processing times. Your provider will discuss them with you during a follow-up visit.
Can I Take Medications Before Blood Collection?
Yes, but always inform your provider about all medications, including over-the-counter drugs or supplements. Some may affect glucose levels, so they can be adjusted temporarily if 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