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Insulin, 30-Minute Postprandial (Serum) by Immunoassay

Published: August 9, 2026Updated: August 16, 2026

This test measures insulin levels in your blood 30 minutes after eating to help assess how your body responds to glucose.

Quick summary

["Helps diagnose and monitor conditions like diabetes or insulin sensitivity."]

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

Key facts at a glance

LOINC
1565-1
Short code
Insulin 30M p TBM IV SerPl-mCnc
Synonyms
Insulin 30M 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 Is This Test Done?

Your doctor may order this test if they suspect you have diabetes, prediabetes, or an insulin-related disorder. It can also help evaluate how well your body processes sugar after eating.

What to Expect Before the Test

You’ll likely fast for 8–12 hours before the test. Bring any medications you’re taking and let your doctor know if you have any allergies. If you’re pregnant or breastfeeding, inform your provider.

How the Test Works

A blood sample is taken from a vein in your arm. The sample is sent to a lab where insulin levels are measured using an immunoassay method, which detects the protein hormone in your serum.

What the Results Mean

Results help determine if your insulin levels are too high or low after eating, which can indicate how your body manages blood sugar. Your doctor will compare these results to your overall health and other tests.

Reference range

INR: 0.8-1.2 (warfarin: 2.0-3.0)N/A

Specimen: serum

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 or type 2 diabetes. Low levels could indicate inadequate insulin production or other metabolic issues. This test is critical for diagnosing conditions like reactive hypoglycemia or distinguishing between types of diabetes.

Short name

Insulin (30 min post-meal)

Frequently asked questions

How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab’s processing time.
Can I eat or drink anything before this test?
No, you must fast for 8–12 hours before the test, except for water. Avoid caffeine or sugary drinks.
Will I feel any pain or discomfort during the test?
You may feel a slight pinch when the needle is inserted, but most people tolerate it well. The area might sting briefly, but it’s usually over quickly.
  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