OGTT (Oral Glucose Tolerance Test)

Fasting Required
CPT: 82951
Metabolic

What This Test Measures

Multiple glucose measurements after 75g glucose drink; standard for diagnosing gestational diabetes and prediabetes.

Preparation

Fasting required (8-12 hours)
Fasting 8–12 hours required for most accurate results. Water is fine. Even small amounts of food, juice, or gum can affect results.

General guidelines only. Requirements vary by lab and individual. Confirm with your provider before adjusting any medications.

Turnaround Time

Varies by lab

Clinical Notes

3-hour test (100g) for gestational DM; 2-hour test (75g) for general DM screening

ICD-10 Codes

Common diagnosis codes associated with this test. Codes are assigned by your provider.

E10.9Type 1 diabetes mellitus without complications
E11.9Type 2 diabetes mellitus without complications
R73.09Other elevated blood glucose level
Z13.1Encounter for screening for diabetes mellitus

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Lab Codes

Proprietary codes used by each lab for this test.

Quest Diagnostics
35181(order_code)

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For informational purposes only

This page is for educational and research purposes only and does not constitute medical advice, diagnosis, or treatment recommendations. ICD-10 and CPT codes are assigned by your healthcare provider. Always consult a qualified healthcare provider before ordering any lab test or making decisions about your health.