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Tag: oral glucose tolerance test

September 3, 2026

Can Fatigue Be an Early Sign of Diabetes? Symptoms, Blood Tests, and Other Causes

When unusual tiredness may point to high blood sugar, which tests can clarify the cause, and when another explanation is more likely.

Fatigue can occur with diabetes, but tiredness by itself cannot tell you whether your blood sugar is high. The most useful clues are the pattern of fatigue, the symptoms that appear with it, your risk […]

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August 27, 2026

High A1C Levels Without Diabetes: Is It Possible

A high A1C can reflect true dysglycemia, red-blood-cell changes, or an assay interference. The right next step is confirmation—not assuming that you do or do not have diabetes.

It is possible to have a high A1C without an established diabetes diagnosis. An A1C of 5.7% to 6.4% is in the prediabetes range. An A1C of 6.5% or higher meets a diabetes diagnostic threshold, […]

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August 25, 2026

PMOS (Formerly PCOS) and Diabetes Risk: Why a Normal A1C May Not Tell the Whole Story

Learn why PMOS can increase impaired glucose tolerance and type 2 diabetes risk—and why OGTT, A1C, fasting glucose, lipids, and metabolic trends should be read together.

Polyendocrine Metabolic Ovarian Syndrome (PMOS), formerly called Polycystic Ovary Syndrome (PCOS), is both a reproductive and metabolic condition. The diabetes connection is important because glucose dysregulation can develop even when fasting glucose, A1C, or body […]

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August 11, 2026

Diabetes and Prediabetes Blood Tests: A1C, Glucose, Insulin, and C-Peptide

Compare diabetes blood tests—including A1C, fasting glucose, OGTT, insulin, and C-peptide—for screening, diagnostic support, and ongoing monitoring.

Diabetes blood tests are not interchangeable. In nonpregnant adults, A1C, fasting plasma glucose, and the two-hour plasma glucose value from a 75-gram oral glucose tolerance test can be used for screening and diagnostic support. A […]

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