Is it too late to have an amniocentesis in the 3rd trimester?

No: It is easier to do amnio in the third trimester when amniotic fluid is abundant. Uses of third trimester amnio include testing fetal maturity (surfactant, other levels) to time delivery when there are complications (e.g., maternal pre-eclampsia). Use for genetic testing may allow preparation for a severe disorder (e.g., fetal trisomy 18) without options for pregnancy termination.

No: All procedures have risks and benefits. For a full discussion of the risks/benefits, you can either schedule a Virtual/Inbox Consult with me or get with your local OB/GYN. Good luck!