Glucose measured 15 minutes postprandially (post-meal) in serum/plasma
This test checks your blood sugar level 15 minutes after eating, helping doctors assess how your body responds to food.
["Understanding how quickly your blood sugar rises after meals can help manage diabetes or other metabolic conditions."]
Key facts at a glance
- LOINC
- 48109-3
- Short code
- Glucose 15M pre glc SerPl-sCnc
- Synonyms
- Glucose 15M pre glc 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?
Doctors may order this test to evaluate how your body processes glucose, especially if you have diabetes, prediabetes, or other conditions affecting blood sugar regulation. It helps monitor how well your body responds to food and may be part of a broader evaluation for metabolic health.
What Does This Test Measure?
This test measures the concentration of glucose (sugar) in your blood shortly after you eat. Unlike standard fasting glucose tests, this one looks at how quickly your blood sugar spikes and recovers, which can indicate how efficiently your body uses insulin.
How Is This Test Performed?
A healthcare provider will take a small blood sample from your arm or finger. The blood is processed to separate serum or plasma, and the glucose level is measured using a specialized lab technique. The test is typically done in a clinical setting with trained professionals.
What Are Common Reasons for This Test?
This test may be recommended if you have symptoms like frequent hunger, fatigue, or unexplained weight changes, or if your doctor suspects issues with glucose metabolism. It can also be part of routine monitoring for people with diabetes or those at higher risk.
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.
High glucose levels 15 minutes post-meal may suggest poor insulin function, delayed digestion, or other metabolic issues. Consistently elevated or erratic glucose responses can indicate conditions like diabetes, gastrointestinal disorders, or hormonal imbalances. This test helps guide treatment plans, such as dietary adjustments or medication changes, to improve blood sugar control.
Frequently asked questions
What does a high or low glucose reading 15 minutes after eating mean?
How soon after eating should I expect results?
Can I eat or drink anything before this test?
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