A Patient Recently Learned That She Is Pregnant and Would $\alpha$

Multiple Choice

A patient recently learned that she is pregnant and would like to set up an appointment to have blood drawn for screening of various markers related to birth defects, including $\alpha$ ₁-fetoprotein.In scheduling this appointment, the nurse should recall that the optimal weeks of gestation for conducting this test are which of the following?

A) 12 to 14 weeks
B) 16 to 18 weeks
C) 20 to 22 weeks
D) 24 to 26 weeks