Proceeds from website advertising help sustain Lab Tests Online. AACC is a not-for-profit organization and does not endorse non-AACC products and services.

Pregnancy & Prenatal Testing

Print this page
Share this page:

Second Trimester (13 – 27 weeks)

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.

Routine tests:

Selective tests: 

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, also called a sonogram, may also be useful earlier, later, or again during the pregnancy to look for an indication of problems with the fetus' organs as well as to confirm fetal age and proper growth. Ask your health care provider what is appropriate in your situation.