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A woman who is trying to get pregnant tells the nurse that she was very disappointed several months ago when she was informed that her positive pregnancy test was a false positive. Which method of testing provides the greatest degree of accuracy? A. Visualization of implantation by vaginal ultrasound. B. Presence of amenorrhea for 2 months. C. Maternal blood serum tests positive for alpha-fetoprotein. D. Complaints of feeling tired all of the time.

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