Insulin concentration (3-hour postprandial, plasma)
This test measures your insulin levels in plasma three hours after eating. It helps assess how your body responds to glucose after consuming food.
["Evaluates how well your pancreas produces insulin after eating."]
Key facts at a glance
- LOINC
- 1566-9
- Short code
- Insulin 3h p TBM IV SerPl-mCnc
- Synonyms
- Insulin 3h p TBM IV SerPl-mCnc
- Category
- hormone
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 0.8
- Ref high
- 1.2
- Critical range
- — – 5 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 85610
- SNOMED
- 396252006
- 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
Doctors may order this test to check for conditions like diabetes, insulin resistance, or hypoglycemia. It can also help monitor how well medications for blood sugar control are working.
What to Expect Before the Test
You’ll likely fast for 8–12 hours before the test. Bring any medications you’re currently taking, as some doctors may ask you to stop certain drugs temporarily. A healthcare provider will draw blood from a vein in your arm.
What the Test Involves
After fasting, you’ll eat a standard meal (often containing a specific amount of carbohydrates). Blood is drawn three hours later to measure insulin levels in your plasma. The test is usually done in a lab setting with minimal discomfort.
What the Results Mean
Results help determine if your body produces enough insulin after meals. Abnormal levels may indicate issues like diabetes, metabolic syndrome, or other endocrine disorders. Your doctor will interpret results in the context of your overall health.
Reference range
INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A
Inform your healthcare provider if you are taking blood thinners. No special preparation required.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
High insulin levels after eating may suggest insulin resistance, where your body doesn’t use insulin effectively, or hyperinsulinemia, which can contribute to weight gain, heart disease, or other metabolic complications. Low levels may indicate inadequate insulin production or other endocrine disorders. This test is particularly useful for diagnosing or monitoring conditions like type 2 diabetes, prediabetes, or reactive hypoglycemia.
Short name
3-Hour Post-Meal Insulin (Plasma)
Frequently asked questions
How long does it take to get results from this test?
What should I do if I feel dizzy or weak after eating before the test?
Can I take my diabetes medication before 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