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Oral glucose tolerance test: indications and limitations.
1Division of Endocrinology/Metabolism, Mayo Clinic, Rochester, MN 55905.
Mayo Clinic Proceedings
|March 1, 1988
Summary
The oral glucose tolerance test has limited clinical use and should not evaluate reactive hypoglycemia. It is useful for diabetic complication symptoms in specific patients and essential for gestational diabetes screening in pregnant individuals.
Area of Science:
- Endocrinology
- Clinical Diagnostics
Background:
- The oral glucose tolerance test (OGTT) is a widely used diagnostic tool.
- Its practical applicability in various clinical scenarios is often debated.
- Understanding the appropriate use of OGTT is crucial for accurate patient management.
Purpose of the Study:
- To delineate the specific clinical situations where the oral glucose tolerance test is applicable.
- To clarify the limitations of the OGTT in diagnostic evaluations.
- To provide guidance on the appropriate use of OGTT in patients with suspected diabetes and during pregnancy.
Main Methods:
- Review of existing clinical guidelines and literature on the oral glucose tolerance test.
- Analysis of the test's utility in diagnosing reactive hypoglycemia.
- Evaluation of OGTT's role in identifying diabetic complications.
- Assessment of OGTT protocols for gestational diabetes screening.
Main Results:
- The oral glucose tolerance test is not recommended for evaluating reactive hypoglycemia.
- OGTT can be beneficial for patients with fasting plasma glucose < 140 mg/dl exhibiting diabetes complication symptoms.
- Mandatory screening for gestational diabetes using a 50-g glucose challenge at 24-28 weeks is recommended, followed by OGTT if abnormal.
Conclusions:
- The oral glucose tolerance test has specific, rather than universal, clinical applications.
- Appropriate utilization of OGTT enhances diagnostic accuracy for diabetes and related conditions.
- Screening protocols for gestational diabetes necessitate specific OGTT procedures.