How you prepare

By Mayo Clinic Staff

If you're having amniocentesis done before week 20 of pregnancy, your bladder must be full during the procedure. Drink plenty of fluids before your appointment. After 20 weeks of pregnancy, your bladder must be empty during amniocentesis.

Your health care provider might ask you to sign a consent form before the procedure begins. Consider asking someone to accompany you to the appointment for emotional support or to drive you home afterward.

Oct. 10, 2012