A 20-year-old nulliparous female college student sees the nurse because she has missed her last two menstrual periods. She reports she has not had sexual intercourse in one month. The nurse requests a pregnancy test, which is negative. Based on this client's history, which assessment is most important for the nurse to obtain?

Choice A rationale Missed menstrual periods (amenorrhea) in a nulliparous female with a negative pregnancy test warrant assessment for endocrine imbalances. Changes in body weight, hirsutism (excessive hair growth), and thyroid enlargement (goiter) can indicate hormonal disorders such as polycystic ovary syndrome (PCOS) or thyroid dysfunction, which commonly disrupt menstrual cycles. Choice B rationale Urinary frequency, unsteady gait, and dental enamel erosion are not directly associated with amenorrhea in the absence of pregnancy. Urinary frequency might suggest a urinary tract infection or diabetes. Unsteady gait can indicate neurological issues, and dental enamel erosion is often linked to bulimia, none of which primarily cause missed periods. Choice C rationale Vaginal discharge and genital warts are indicative of sexually transmitted infections (STIs), while abdominal tenderness could suggest pelvic inflammatory disease or other abdominal pathology. While STIs can impact reproductive health, they are not primary causes of amenorrhea. Abdominal tenderness might be a symptom but not the most important assessment for this presentation. Choice D rationale Breast tenderness, tremors, and high blood pressure are less specific for the evaluation of amenorrhea. Breast tenderness can be a premenstrual symptom or related to hormonal fluctuations. Tremors might indicate thyroid issues, and high blood pressure is a cardiovascular concern. These are not the most direct assessments for the presenting complaint of missed periods.