midtrimester

Midtrimester refers to the middle portion of pregnancy, commonly defined as the second trimester, approximately 13 to 27 or 28 weeks’ gestation. It lies between the first trimester, when organ formation is ongoing, and the third trimester, when rapid fetal growth continues toward birth. In the midtrimester, many people experience relief from first-trimester symptoms, while the uterus enlarges and fetal movements become more noticeable.

During this period, fetal development continues with organ systems maturing and patterns of growth becoming more predictable. Routine prenatal care continues with regular visits, including blood pressure and urine tests, and surveillance for possible complications. A key screening during the midtrimester is the fetal anatomy ultrasound, usually performed around 18 to 22 weeks, to evaluate fetal anatomy, placenta position, amniotic fluid, and growth. Depending on guidelines and risk factors, additional screening may include a maternal serum screen or noninvasive prenatal testing.

For routine management, the midtrimester is also when the glucose tolerance test for gestational diabetes is commonly offered, typically between 24 and 28 weeks. Growth monitoring via fundal height measurements and fetal heartbeat assessments help track progress.

Outcomes depend on overall health, pregnancy history, and any complications. While most pregnancies reach the end of the midtrimester without issue, conditions such as preterm labor risk, placenta previa, or fetal growth concerns may be identified and managed during this period.