Skip to content

Insulin, Serum (2-Hour Postprandial Glucose Stimulation)

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

This test measures your insulin levels after eating a meal with glucose to help assess how your body responds to sugar. It’s often used to evaluate diabetes management or insulin sensitivity.

Quick summary

["This test helps check if your body produces enough insulin after eating."]

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

Key facts at a glance

LOINC
72901-2
Short code
Insulin 2h p 75 g Glc PO SerPl-sCnc
Synonyms
Insulin 2h p 75 g Glc PO 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

Why This Test Is Done

Your doctor may order this test if you have diabetes or are at risk for it, or if you’re being evaluated for conditions like prediabetes or insulin resistance. It can also help monitor how well your current diabetes treatment is working.

What to Expect Before the Test

You’ll fast overnight before the test, then eat a specific meal containing glucose. Blood is drawn 2 hours later to measure insulin levels. Avoid caffeine or smoking before testing.

What the Results Mean

Results help determine if your insulin levels are normal or low after eating, which can indicate how well your body processes glucose. Abnormal results may signal diabetes, insulin resistance, or other metabolic issues.

Common Conditions Linked to This Test

High insulin levels after eating might suggest insulin resistance or reactive hypoglycemia, while low levels could indicate diabetes or poor glucose tolerance. Your doctor will interpret results in the context of your overall health.

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: Elevated postprandial insulin can indicate insulin resistance or impaired glucose metabolism, often seen in type 2 diabetes or metabolic syndrome. Low levels may suggest inadequate insulin production or poor glucose regulation, warranting further evaluation of diabetes management.

Short name

Insulin (2-Hour Post-Meal)

Frequently asked questions

What does a ‘normal’ result mean for me?
A ‘normal’ result means your insulin levels after eating are within expected ranges for your body, suggesting your pancreas is producing insulin appropriately to manage blood sugar. However, your doctor will consider your full medical history and other test results to make a diagnosis.
How often should I get this test?
Your doctor will determine how often you need this test based on your health status, such as whether you have diabetes, prediabetes, or other conditions affecting blood sugar. Typically, it may be done annually or more frequently if you’re managing diabetes.
Can lifestyle changes affect my insulin levels?
Yes, diet, exercise, and weight management can influence insulin levels. Eating a balanced diet, staying active, and maintaining a healthy weight may improve insulin sensitivity and help regulate blood sugar levels.
  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