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Tag: high A1C

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 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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