OGTT

Medical abbreviation · Endocrinology & Diabetes

OGTT stands for Oral glucose tolerance test, an endocrinology & diabetes abbreviation.

Test in which a fasting patient drinks a standard glucose load, usually 75 g, and blood glucose is measured two hours later. A 2-hour value of 200 mg/dL or more diagnoses diabetes, and 140–199 mg/dL indicates impaired glucose tolerance.

Example: 2-hour OGTT 214 mg/dL despite normal A1C; diabetes confirmed.

Usage notes

The OGTT detects some diabetes missed by fasting glucose or A1C, especially in people of Asian descent and after gastric surgery. Pregnancy versions use a 50 g challenge, a 100 g 3-hour test or a 75 g 2-hour test. Patients should eat a normal carbohydrate diet for three days beforehand. Also called GTT.

Related abbreviations

More endocrinology & diabetes abbreviations

• MEN – Multiple endocrine neoplasia
• MetS – Metabolic syndrome
• MNG – Multinodular goiter
• MODY – Maturity-onset diabetes of the young
• MTC – Medullary thyroid carcinoma
• NIDDM – Non-insulin-dependent diabetes mellitus
• PA – Primary aldosteronism
• PCOS – Polycystic ovary syndrome
• PHPT – Primary hyperparathyroidism
• PRL – Prolactin
• PTC – Papillary thyroid carcinoma
• PTH – Parathyroid hormone

See all 64 endocrinology & diabetes abbreviations →

Edited by the AbbreviationList.com team. Spotted an error or a missing meaning? Contact us.

This entry is for general education and is not medical advice. Abbreviation use varies between institutions; always confirm in context.