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Serum Insulin Concentration with Glucose Measurement (5-Minute Postprandial)

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

This test measures your insulin levels and blood sugar (glucose) after eating to check how your body responds to food.

Quick summary

["Helps assess how well your body manages blood sugar and insulin after meals."]

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

Key facts at a glance

LOINC
55480-8
Short code
Insulin 5M pre Glc SerPl-sCnc
Synonyms
Insulin 5M pre Glc SerPl-sCnc
Category
glucose
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
2.6
Ref high
24.9
Fasting
true
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 This Test Measures

Your blood will be drawn after you eat a meal (typically a standardized carbohydrate-rich snack). The test checks two things: your insulin levels (a hormone that helps control blood sugar) and your blood glucose levels at 5 minutes post-meal. This helps doctors evaluate how efficiently your body processes food and regulates blood sugar.

Why It’s Done

Doctors may order this test if you have diabetes, prediabetes, or symptoms like frequent hunger, fatigue, or unexplained weight changes. It can also help diagnose conditions affecting insulin sensitivity or glucose metabolism.

What to Expect

You’ll eat a small meal or snack before the blood draw, usually within 30–60 minutes. The test involves a quick venipuncture (blood draw) from your arm. It’s quick and rarely causes discomfort. Avoid caffeine or heavy meals before the test.

Preparation Tips

Follow your doctor’s instructions carefully. Fast for 8–12 hours before testing if fasting is required, but eat the prescribed meal/snack right before the blood draw. Wear comfortable clothing and bring your test confirmation if needed.

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.

◆Associated findings1

Short name

Post-meal insulin + glucose test

Frequently asked questions

How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab. Follow up with your healthcare provider to discuss findings.
What does a ‘normal’ result mean?
There’s no single ‘normal’ range for post-meal insulin and glucose because it varies by individual. Your doctor will compare your results to your baseline and overall health to interpret them.
Can I eat before the test if I’m not fasting?
Yes, but you must eat the prescribed meal/snack right before the blood draw to trigger a post-meal response. Skipping this step may invalidate the test.
  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