Glucose (Serum or Plasma, 11 AM Postprandial)
This test measures the amount of glucose (sugar) in your blood after you’ve eaten, specifically at 11 AM post-meal. It helps assess how your body processes sugar and can indicate how well your blood sugar is controlled.
["This test helps check for diabetes or how well your body manages blood sugar after eating."]
Key facts at a glance
- LOINC
- 16166-1
- Short code
- Glucose 11 AM SerPl-mCnc
- Synonyms
- Glucose 11 AM SerPl-mCnc
- 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 or low blood sugar, such as frequent urination, excessive thirst, fatigue, or unexplained weight changes. It’s also used to monitor blood sugar control in people with diabetes or prediabetes, especially after meals.
What to Expect Before the Test
You’ll typically fast for 8 to 12 hours before this test, but your healthcare provider may specify a different timing, such as eating a standard meal 1 hour prior to the 11 AM draw. Bring any medications or supplements you take with you. A blood sample will be taken from a vein in your arm.
What Happens During the Test?
A healthcare professional will clean the area with an antiseptic, insert a small needle into your vein, and collect a blood sample. The process usually takes a few minutes. You may feel a brief pinch or sting, but it’s generally quick and painless.
What to Expect After the Test
After the blood is drawn, the needle will be removed, and a bandage will be applied. You can resume normal activities immediately. If you experience any unusual pain, swelling, or signs of infection (like increased redness or warmth), contact your healthcare provider.
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 after eating can indicate poor blood sugar control, especially in people with diabetes. Repeatedly elevated levels may signal diabetes or insulin resistance. Low glucose levels (hypoglycemia) can cause symptoms like shakiness, dizziness, or confusion. Your provider will use these results to guide treatment plans, such as adjusting medications or dietary habits.
Short name
Glucose Level (AMPP)
Frequently asked questions
How often should I expect this test?
What do my results mean?
Yes, but follow your provider’s instructions precisely. Typically, you’ll fast for 8 to 12 hours before the test, except for a small amount of water. If your provider specifies an 11 AM postprandial test, you’ll eat a standard meal 1 hour before the draw. Never eat or drink anything else during the fasting period unless instructed otherwise.
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