A 39-year-old primigravida woman believes that she is approximately 8 weeks pregnant, although she has had irregular menstrual periods all her life. She has a history of smoking approximately one pack of cigarettes a day; however, she tells the nurse that she is trying to cut down. Her laboratory data are within normal limits. What diagnostic technique would be useful at this time?

a. Ultrasound examination

b. Maternal serum alpha-fetoprotein (MSAFP) screening

c. Amniocentesis

d. Nonstress t...
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