Glucose in Serum (24-Hour Profile)
This test measures your blood sugar levels over a full day to help track how your body responds to food, activity, and medications.
["Understanding your daily blood sugar patterns can help manage diabetes or other conditions affecting glucose levels."]
Key facts at a glance
- LOINC
- 102843-0
- Short code
- Wheat IgG RAST
- Synonyms
- Wheat IgG RAST
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 10
- Ref high
- 40
- Critical range
- — – 500 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- rast
- CPT
- 84484
- SNOMED
- 302774002
- 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 Is Done
Your doctor may order this test if you have diabetes, prediabetes, or symptoms like frequent urination, extreme thirst, or unexplained weight changes. It can also assess how well your current treatment plan is working or identify hidden risks for conditions like hypoglycemia or hyperglycemia.
What to Expect Before the Test
You’ll typically fast overnight before collecting blood samples throughout the day. Follow your doctor’s instructions carefully to ensure accurate results. Bring a water bottle and snacks approved by your healthcare provider to stay hydrated and maintain energy levels.
How the Test Works
Blood samples are taken at set times (often every 2–4 hours) to measure glucose concentration in serum. The samples are analyzed using an immunoassay or enzymatic method to detect glucose levels.
What the Results Mean
Results show your glucose levels at different times of the day. Normal patterns vary by individual, but consistent high or low readings may signal diabetes, insulin resistance, or other metabolic issues. Your doctor will interpret these results in the context of your overall health.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
This test is critical for diagnosing diabetes, assessing glycemic control in patients on insulin or oral medications, and identifying conditions like reactive hypoglycemia or fasting hyperglycemia. Abnormal patterns may also indicate underlying endocrine disorders or poor adherence to treatment plans.
Short name
24-Hour Blood Sugar Monitoring
Frequently asked questions
How often should I expect this test?
What should I do if I miss a blood draw?
Can I eat or drink anything before or during the 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 17, 2026. · Read our editorial policy