Glucose, 2-Hour Postprandial (Serum/Plasma)
This test measures your blood sugar level two hours after eating to help assess how your body processes glucose. It’s often used to diagnose or monitor diabetes or glucose metabolism disorders.
["This test helps doctors check how well your body manages blood sugar after meals."]
Key facts at a glance
- LOINC
- 14995-5
- Short code
- Glucose 2h p 75 g Glc PO SerPl-sCnc
- Synonyms
- Glucose 2h p 75 g Glc 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 This Test Matters
Your doctor may order this test if you have symptoms like frequent urination, excessive thirst, fatigue, or unexplained weight changes. It’s also used during diabetes screening or evaluation of glucose control in people with prediabetes or type 2 diabetes.
What to Expect Before the Test
You’ll typically fast overnight (usually 8–12 hours) before this test. On the day of the test, avoid eating or drinking anything except water. Your blood will be drawn from a vein in your arm, and you may feel a small pinch or discomfort.
How the Test Works
After eating a meal, your blood sugar rises. This test measures the level two hours later to see how effectively your body regulates glucose. The test uses a blood sample drawn from your arm, which is then analyzed in a lab to determine the concentration of glucose.
What the Results Mean
Results are compared to standard reference ranges to identify whether your blood sugar is consistently high, low, or within normal limits. Abnormal results may prompt further testing or adjustments to your treatment plan.
Reference range
Fasting: 70-100 mg/dLN/A
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.
This test plays a key role in diagnosing diabetes, assessing prediabetes, or evaluating how well diabetes medications or lifestyle changes are working. High levels may indicate poor glucose control, while low levels could signal hypoglycemia or other metabolic issues.
Short name
2-Hour Blood Sugar Test
Frequently asked questions
What causes abnormal results in this test?
How often should I get this test?
Can I prepare differently if I have kidney or liver issues?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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