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Glucose Tolerance Test, 3 Specimens (75g)
Quest Diagnostics1 test optionFrom $22.49
Glucose Tolerance Test, 3 Specimens (75g)
Quest DiagnosticsCatalog information reviewed: August 24, 2026 by the Sunridge Medical clinical team.
What this laboratory test evaluates
DetailsGlucose Tolerance Test, 3 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 ensure accurate results, patients need to fast overnight and then consume a 75g glucose solution. A fasting blood sample is taken immediately after. For children, the glucose amount is adjusted to their body weight. Diabetes may be diagnosed if fasting glucose levels are ≥126 mg/dL or if glucose levels are ≥200 mg/dL two hours after consuming the glucose.
Who should take this test?This test is suitable for individuals showing symptoms of diabetes or for routine diabetes screening in non-pregnant adults and children.
What type of sample is required?Three 1 mL plasma samples are needed for this test, collected in fluoride/oxalate (gray-top) tubes.
Test ResourcesFor more information, please consult your healthcare provider.
Additional test information
This test is suitable for individuals showing symptoms of diabetes or for routine diabetes screening in non-pregnant adults and children.
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, 3 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 ensure accurate results, patients need to fast overnight and then consume a 75g glucose solution. A fasting blood sample is taken immediately after. For children, the glucose amount is adjusted to their body weight. Diabetes may be diagnosed if fasting glucose levels are ≥126 mg/dL or if glucose levels are ≥200 mg/dL two hours after consuming the glucose.
Who should take this test?This test is suitable for individuals showing symptoms of diabetes or for routine diabetes screening in non-pregnant adults and children.
What type of sample is required?Three 1 mL plasma samples are needed for this test, collected in fluoride/oxalate (gray-top) tubes.
Test ResourcesFor more information, please consult your healthcare provider.
Additional details
This test is suitable for individuals showing symptoms of diabetes or for routine diabetes screening in non-pregnant adults and children.
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, 1-hour (post 75 g glucose PO)
- Glucose, 2-hour (post 75 g glucose PO)
- Glucose, Fasting