Serum Insulin with 24-Hour Collection (Quantitative)
This test measures the amount of insulin in your blood after a 24-hour period, often used to assess insulin production and metabolic function.
["Helps evaluate how your body manages blood sugar over time."]
Key facts at a glance
- LOINC
- 56943-4
- Short code
- Insulin 68h p chal SerPl-aCnc
- Synonyms
- Insulin 68h p chal SerPl-aCnc
- Category
- hormone
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 2.6
- Ref high
- 24.9
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 83525
- SNOMED
- 413618004
- 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
A 24-hour insulin test may be recommended if you have symptoms of diabetes, insulin resistance, or unexplained blood sugar fluctuations. It helps doctors understand how your body naturally produces insulin, which is crucial for diagnosing conditions like diabetes or evaluating metabolic disorders.
What to Expect Before the Test
You’ll need to collect blood samples over a full 24-hour period, typically at home or in a clinic. Follow your healthcare provider’s instructions carefully, including fasting guidelines and timing of sample collection. This ensures accurate results reflecting your natural insulin levels.
How the Test Works
Blood samples are taken at scheduled intervals (e.g., every few hours) and analyzed for insulin concentration. The test measures the total insulin your body produces, not just after meals.
What the Results Mean
Results help determine if your insulin levels are within expected ranges for your body’s needs. Abnormal results may indicate conditions like diabetes, hyperinsulinemia, or other metabolic issues.
Reference range
Fasting: 2.6-24.9 μIU/mLN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is particularly useful for diagnosing or monitoring conditions where insulin production is abnormal, such as type 1 or type 2 diabetes, insulinoma (a tumor causing excess insulin), or insulin resistance. It can also help assess how well your body regulates blood sugar over time.
Frequently asked questions
How is this test different from a standard insulin test?
What should I do if I miss a blood draw during the 24-hour period?
Can I take medications before or during this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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