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Glucose Tolerance Test, 2 Specimens (75g)
Quest Diagnostics1 test optionFrom $14.99
Glucose Tolerance Test, 2 Specimens (75g)
Quest DiagnosticsCatalog information reviewed: August 24, 2026 by the Sunridge Medical clinical team.
What this laboratory test evaluates
DetailsGlucose Tolerance Test, 2 Specimens (75g) – This test is primarily used to diagnose diabetes in children and adults who are not pregnant. For pregnant women, a different test is recommended. To get accurate results, patients need to fast overnight and then consume a 75g glucose solution. The amount of glucose for children is adjusted based on their ideal body weight. Diabetes may be diagnosed if the fasting glucose level is equal to or greater than 126 mg/dL, or if the glucose level two hours after consuming the glucose solution is equal to or greater than 200 mg/dL.
What patients is this test right for?This test is suitable for individuals who are being evaluated for diabetes, including children and non-pregnant adults. Pregnant women are advised to take a different version of the glucose tolerance test.
What type of sample is required for this test?Two 1 mL plasma samples are needed for this test. These samples should be collected in fluoride/oxalate (gray-top) tubes.
Test ResourcesResources for this test are currently not available.
Additional test information
This test is suitable for individuals who are being evaluated for diabetes, including children and non-pregnant adults.
Collection and processing
- Sample type: Plasma
- Fasting: Yes
- Estimated laboratory processing: Results should be available in 2 – 5 business days after the sample is collected
How Sunridge uses laboratory information
Sunridge considers the medical question, symptoms, history, medications, prior results, and whether the finding could change care before recommending testing. A laboratory result is not interpreted in isolation and does not establish a diagnosis by itself.
Before requesting this test
Availability, collection requirements, eligibility, and processing estimates can change. Sunridge reviews each request and, when appropriate, creates the order through Fullscript. Follow the current instructions supplied with the approved order.
Common questions about this laboratory test
- What sample does this test require?
- The listed sample type is Plasma. Confirm current collection instructions in the approved order.
- Does this test require fasting?
- The current catalog record lists fasting as: Yes. Follow the instructions supplied with the approved order.
- How long does laboratory processing usually take?
- Results should be available in 2 – 5 business days after the sample is collected. Timing can change after collection or if a laboratory requires additional review.
About this test
DetailsGlucose Tolerance Test, 2 Specimens (75g) - This test is primarily used to diagnose diabetes in children and adults who are not pregnant. For pregnant women, a different test is recommended. To get accurate results, patients need to fast overnight and then consume a 75g glucose solution. The amount of glucose for children is adjusted based on their ideal body weight. Diabetes may be diagnosed if the fasting glucose level is equal to or greater than 126 mg/dL, or if the glucose level two hours after consuming the glucose solution is equal to or greater than 200 mg/dL.
What patients is this test right for?This test is suitable for individuals who are being evaluated for diabetes, including children and non-pregnant adults. Pregnant women are advised to take a different version of the glucose tolerance test.
What type of sample is required for this test?Two 1 mL plasma samples are needed for this test. These samples should be collected in fluoride/oxalate (gray-top) tubes.
Test ResourcesResources for this test are currently not available.
Additional details
This test is suitable for individuals who are being evaluated for diabetes, including children and non-pregnant adults.
Highlighted health areas
- Metabolic function
- Nutrition
Biomarkers and report focus
The exact analytes and report format can change. Confirm the current contents in the Fullscript order before payment.
- Glucose, 2-hour (post 75 g glucose PO)
- Glucose, Fasting