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Glucose, 2-hour postprandial (plasma)

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

This test measures your blood sugar level two hours after eating to check how your body processes glucose. It helps assess how well your body manages blood sugar after meals.

Quick summary

["Helps diagnose and monitor diabetes and glucose metabolism over time."]

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

Key facts at a glance

LOINC
14758-7
Short code
Glucose 2h p 50 g Lac PO SerPl-sCnc
Synonyms
Glucose 2h p 50 g Lac PO SerPl-sCnc
Category
glucose
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
70
Ref high
100
Critical range
50 N/A – 400 N/A
Fasting
true
Population
adult
Sex
all
Age range
18–65 years
CPT
82947
SNOMED
260395008
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 healthcare provider may order this test if you have symptoms of high blood sugar (like frequent urination or extreme thirst), if you have diabetes or are at risk, or if you need to track how well your body responds to food.

What to Expect Before the Test

You’ll fast overnight (usually 8–12 hours) before the test, then eat a standard meal. Blood is drawn two hours after eating to measure your glucose level.

How the Test Works

A small sample of your blood (plasma) is collected and analyzed to measure glucose concentration using a chemical method.

What the Results Mean

Results help determine if your blood sugar is controlled after meals, which is important for managing conditions like diabetes.

Reference range

Fasting: 70-100 mg/dLN/A

Specimen: serum

Fasting for 8-12 hours required. Water is permitted. Avoid chewing gum and smoking before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

High post-meal glucose may indicate poor glucose tolerance, diabetes, or insulin resistance. Low levels could signal hypoglycemia or other metabolic issues.

Short name

2-Hour Post-Meal Blood Sugar

Frequently asked questions

How often should I get this test?
Your doctor will decide based on your health needs—typically every 3–12 months for diabetes management or if symptoms change.
Can I eat or drink anything before this test?
No, you must fast (no food or liquids except water) for the required fasting period before the meal and test.
What if I have a blood sugar test instead?
This test specifically checks glucose levels *after* eating, unlike fasting tests, which measure levels before meals.
  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