The laboratory tests performed during the second trimester of pregnancy provide information to evaluate both actual and potential medical problems in the baby while continuing to monitor the mother's health during the pregnancy.
Many women have an ultrasound diagnostic imaging test as part of their routine prenatal care, often between weeks 18 and 20. This non-invasive test, called a sonogram, may also be useful earlier, later, or again during the pregnancy to look for an indication of problems with the baby's organs, such as the heart and lungs. It may also be used to help determine how far along a woman is in her pregnancy and help assess the baby's growth and health. Ask your healthcare practitioner what is appropriate in your situation.