Which test measures glucose levels at four to six weeks of pregnancy?

The test that measures glucose levels at four to six weeks of pregnancy is the glucose tolerance test. This test is specifically designed to evaluate how well the body processes glucose, which is crucial during pregnancy due to the changes in hormone levels and metabolism that can affect blood sugar levels. Conducting the glucose tolerance test during this time can help identify gestational diabetes early, which allows for timely intervention and management to ensure the health of both the mother and the developing fetus.

Other options do serve important roles in monitoring health, but they are not specifically aimed at measuring glucose levels during the early stages of pregnancy. For instance, human chorionic gonadotropin is a hormone tested to confirm pregnancy, while fasting blood sugar is typically used to assess general glucose levels rather than changes throughout pregnancy. Hemoglobin A1c provides an average blood sugar level over an extended period, which may not effectively capture the early fluctuations seen in pregnancy. Thus, the glucose tolerance test is the most appropriate choice for assessing glucose levels during the specified timeframe.