If you are in preterm labor or think you may be, your doctor may do some tests to monitor you and your baby. These tests include:

  • Lab tests—These may involve testing blood, urine, and cells from the cervix or amniotic fluid to look for infection.
  • Ultrasound—This test uses sound waves to create images of the inside of your body. In this case, the ultrasound is done to:
    • Examine the placenta
    • Check the baby’s age
    • Look for birth defects in the baby
    • See the position of the baby
    • Measure the cervix and the amount of amniotic fluid
  • Amniocentesis —This test involves removing a small amount of amniotic fluid to look for infection or to see if the baby’s lungs are mature.