Quick Facts
- Sample: Blood
- Fasting: Fasting for 10-12 hours is required
- Turnaround: 1–2 business days. May take longer based on weather, holidays, or lab delays.
What This Test Measures
The Glucose Serum Test measures the amount of glucose dissolved in the serum portion of your blood after a fasting period of 10-12 hours. This is a current, single-specimen measurement of your blood glucose level at the time of collection, not a longer-term marker of glucose control over weeks or months.
Because this is a fasting measurement, your result reflects how your body is regulating glucose after an extended period without food. It does not, on its own, indicate how your glucose levels behave after eating or over an extended timeframe.
Benefits
- Provides a direct, fasting measurement of your blood glucose level
- Can help identify elevated or low blood glucose levels
- Supports screening for type 1 and type 2 diabetes
- Can be used as part of gestational diabetes screening
- Supports ongoing diabetes management alongside other information
- Delivers results quickly through a simple blood draw
Who Is This Test For?
- Individuals interested in screening for type 1 or type 2 diabetes
- People who want a fasting measurement of their current blood glucose level
- Pregnant individuals whose provider is screening for gestational diabetes
- People managing diabetes who want an updated fasting glucose reading
- Individuals with symptoms or concerns related to high or low blood sugar
- People whose healthcare provider has recommended fasting glucose testing
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. Do I need to fast or prepare for this test?
Fasting for 10-12 hours is required before this test. You should not eat or drink anything other than water during this window to ensure an accurate fasting glucose reading.
2. How quickly will I get results?
Results are typically available in 1-2 days, though timing may take longer based on weather, holidays, or other lab delays.
3. What can my results tell me?
Your fasting glucose result reflects the amount of glucose circulating in your blood serum at the moment of collection. It offers a snapshot that can support screening for diabetes or evaluating how your body is regulating blood sugar after fasting, but it does not capture glucose patterns over time or provide a complete picture of glucose metabolism on its own.
4. What factors can affect my results?
Not fasting for the full 10-12 hours can raise your glucose reading above your true fasting level. Eating, drinking anything other than water, or significant physical activity shortly before your blood draw may also influence your result.
5. How do I interpret the results?
Interpreting a fasting glucose result depends on where your number falls relative to established ranges, along with your symptoms, medical history, and any other testing your provider has ordered. A single elevated or low reading does not by itself confirm or rule out a specific condition, and results should be reviewed alongside your overall clinical picture.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
6. What should I do if my results are abnormal?
Share an abnormal result with a qualified healthcare provider so they can review it in the context of your health history and symptoms. Your provider may consider additional evaluation or testing, but this decision should be made together with you rather than based on this result alone.
Pre-test preparation
Fasting for 10-12 hours is required before this test. During the fasting window, avoid eating or drinking anything other than water to ensure an accurate result.
