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Insulin, 30-Minute Postprandial (Serum/Plasma)

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

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

Quick summary

["Helps identify how well your pancreas produces insulin after eating."]

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

Key facts at a glance

LOINC
12757-1
Short code
Insulin 30M pre chal SerPl-mCnc
Synonyms
Insulin 30M pre chal SerPl-mCnc
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 Matters

Your doctor may order this test if you have symptoms of diabetes, such as frequent hunger, fatigue, or unexplained weight changes, or if you have risk factors like high blood sugar or obesity. It can also help diagnose conditions like reactive hypoglycemia or insulin resistance.

What to Expect Before the Test

You’ll fast for 8–12 hours before the test, then eat a standard meal. Blood is drawn 30 minutes later to check insulin levels. Avoid caffeine or alcohol before testing.

What the Results Mean

Results help determine if your body produces enough insulin after meals. Abnormal levels may indicate diabetes, metabolic disorders, or other health concerns needing further evaluation.

Common Reasons for Testing

Doctors may use this test to diagnose or monitor diabetes, check for insulin resistance, or evaluate how well medications (like insulin) are working in people with type 1 or type 2 diabetes.

Reference range

Fasting: 2.6-24.9 μIU/mLN/A

Specimen: serum

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.

Clinical Significance: Insulin Postprandial Testing

Short name

Insulin 30 min post-meal

Frequently asked questions

How long does it take to get my results?
Results are typically available within 1–3 business days, depending on your lab. Follow-up with your healthcare provider for interpretation.
Can I eat before the fasting period?
No, you must fast strictly for 8–12 hours before testing. Ask your doctor for exact timing if unsure.
Does this test require special preparation beyond fasting?
Yes, you’ll need to eat a specific meal 30 minutes before blood draw. Avoid exercise, smoking, or heavy meals during fasting.
  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