How many elevated glucose levels are needed to diagnose gestational diabetes?

To diagnose gestational diabetes, the standard approach typically requires that at least two elevated glucose levels are identified during a glucose tolerance test. This requirement is part of the two-step screening process for gestational diabetes, where the first step involves a 1-hour glucose challenge test, followed by a 3-hour oral glucose tolerance test if the initial test indicates potential hyperglycemia.

In the glucose tolerance test, elevated levels for diagnosis would usually be defined as any two of the measured values (fasting, 1-hour, 2-hour, or 3-hour) exceeding established thresholds. This evidence underscores that two elevated results are necessary to confirm the diagnosis, recognizing that a single elevated level might reflect a transient abnormality rather than a definitive diagnosis of gestational diabetes.

Thus, the requirement for two elevated levels helps ensure accurate identification of gestational diabetes, allowing for timely intervention to promote maternal and fetal health.