Insulin, Serum/Plasma — 7-Postprandial Challenge, Arbitrary Concentration
Measures insulin in blood at a specified time after a meal or glucose challenge to assess how the pancreas responds to increased glucose.
["This timed insulin test helps evaluate pancreatic insulin production and investigate diabetes or low blood sugar."]
Key facts at a glance
- LOINC
- 27867-1
- Short code
- Insulin sp7 p chal SerPl-aCnc
- Synonyms
- Insulin sp7 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
What is this test?
This test measures the amount of insulin in blood after a meal or a controlled glucose challenge. Insulin is a hormone made by the pancreas that helps glucose enter cells for energy.
Why might I need this test?
Your clinician may order it to evaluate how strongly the pancreas releases insulin, particularly when investigating diabetes, insulin resistance, or episodes of low blood sugar. It may also be used as part of a supervised glucose-tolerance evaluation.
How is the test performed?
Blood is collected from a vein, usually at a precisely scheduled time after the meal or challenge. Because the result depends on timing, the challenge and collection schedule must be followed exactly.
How do I prepare for the test?
Follow your clinician's instructions about fasting, eating, and any glucose challenge. The timing of the blood draw is especially important. Tell the healthcare team about insulin injections and other medicines that can affect insulin levels.
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.
An unexpectedly high insulin response may occur with insulin resistance, glucose intolerance, or excess insulin production. Low insulin despite elevated glucose may indicate reduced pancreatic insulin secretion, while inappropriately high insulin during low blood sugar may suggest hyperinsulinism. Interpretation depends on the glucose result, collection time, medications, and clinical circumstances.
Short name
Insulin challenge test
Frequently asked questions
Is this the same as a routine insulin test?
Do I need to fast?
Why is the collection time so important?
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