Glucose, Serum (Pre-Meal)
This test measures your blood sugar level before eating, often used to monitor blood glucose control, especially in people with diabetes or those at risk.
["A pre-meal glucose check helps track how your body processes food and glucose over time."]
Key facts at a glance
- LOINC
- 1549-5
- Short code
- Glucose pre 100 g Glc PO SerPl-mCnc
- Synonyms
- Glucose pre 100 g Glc PO 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?
Doctors may order this test to assess your blood sugar levels before meals, particularly if you have diabetes, prediabetes, or other conditions affecting glucose metabolism. It can also help evaluate how well medications or lifestyle changes are managing your blood sugar.
What Does the Test Involve?
A healthcare provider will take a blood sample from a vein, usually in your arm. The blood is collected in a tube and sent to a lab for analysis. The test measures the concentration of glucose (sugar) in your serum.
What to Expect Before the Test
No special preparation is usually needed for this test, but you may be asked to fast for a few hours before the sample is taken if it’s part of a broader glucose monitoring series. Always follow your healthcare provider’s instructions.
What Are Common Results?
Results are typically reported as a mass concentration of glucose in your serum. While reference ranges can vary by lab, normal values are generally below a certain threshold. Abnormally high or low levels may indicate underlying health concerns.
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 pre-meal glucose levels may suggest poor diabetes management, insulin resistance, or other metabolic disorders. Consistently low levels could indicate hypoglycemia or certain endocrine conditions. Regular monitoring helps prevent complications like nerve damage, kidney issues, or cardiovascular problems.
Frequently asked questions
What does a pre-meal glucose test measure?
How often should I get this test?
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