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Glucose measured 2 hours post oral glucose challenge in plasma (2-hour postprandial plasma glucose)

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

This test checks how your body processes glucose (sugar) after eating. It’s often used to assess glucose tolerance, especially in pregnancy or for diagnosing conditions like diabetes.

Quick summary

["Helps evaluate blood sugar control after eating."]

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

Key facts at a glance

LOINC
42613-0
Short code
Glucose 2h p Lac PO Ur-mCnc
Synonyms
Glucose 2h p Lac PO Ur-mCnc
Category
glucose
Sample
urine
Container
Sterile urine container
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
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms of high blood sugar (e.g., frequent urination, excessive thirst) or if you’re at higher risk for diabetes. It’s also commonly checked during pregnancy to monitor gestational diabetes.

How the Test Works

You’ll drink a sugary liquid, and blood is drawn from your arm 2 hours later. The test measures the amount of glucose in your plasma, which helps determine how well your body handles sugar.

What to Expect Before the Test

No special preparation is needed, but you should fast for 8–12 hours before the test (if applicable). Wear comfortable clothing and bring any medications you’re taking.

What the Results Mean

Results help diagnose conditions like diabetes or gestational diabetes. Abnormal results may require further testing or follow-up with your provider.

Reference range

Fasting: 70-100 mg/dLN/A

Specimen: urine

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.

◆Associated findings1

Short name

2-hour plasma glucose

Frequently asked questions

What does a high or low result mean?
High results may signal diabetes or pre-diabetes, while low results could be normal or affected by factors like fasting errors or certain medications. Always discuss results with your provider.
Can I eat or drink anything before the test?
Follow fasting instructions if required (usually 8–12 hours). If you’re pregnant or have specific dietary needs, ask your provider for guidance.
Is this test painful?
A small needle is used to draw blood, which may cause mild discomfort. Most people tolerate it well, and the site is typically bandaged afterward.
  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