What is one of the requirements for diagnosing GDM using the two-step method?

The requirement for diagnosing gestational diabetes mellitus (GDM) using the two-step method involves obtaining at least two abnormal glucose measurements. This method typically starts with a screening test, often involving a 50g oral glucose challenge test, where a patient’s blood glucose level is measured one hour after ingestion. If the screening test result is above a predetermined threshold, a follow-up diagnostic test (usually a 3-hour oral glucose tolerance test) is conducted. For a diagnosis of GDM, at least two of the glucose measurements taken during this diagnostic test must meet or exceed the specified cutoff values.

This two-step approach is important because it ensures accurate identification of GDM, as relying on a single abnormal measurement could lead to misdiagnosis. As for the other options, they do not solely address the criteria established for diagnosing GDM using the two-step method; therefore, they do not represent a requirement in this particular context.