AANP Family Nurse Practitioner (FNP) Certification ExamAssessmentMedium
A 32-year-old female presents with a 2-day history of unilateral lower abdominal pain, vaginal spotting, and mild dizziness. Her last menstrual period was 6 weeks ago. A urine pregnancy test is positive. On examination, she has mild right adnexal tenderness. What is the most critical initial diagnostic step?
- ATransvaginal ultrasound
- BSerum progesterone level
- CQuantitative beta-human chorionic gonadotropin (β-hCG) level
- DComplete blood count (CBC)
Show answer & explanationAnswer & explanation
Correct answer: A. Transvaginal ultrasound
The patient's symptoms (unilateral abdominal pain, vaginal spotting, positive pregnancy test, amenorrhea) are highly suggestive of an ectopic pregnancy, which is a medical emergency. A transvaginal ultrasound is the most critical initial diagnostic step as it can directly visualize the location of the pregnancy and confirm or rule out an intrauterine pregnancy, as well as detect an ectopic gestation or free fluid.
Why the other options are wrong
- B. Serum progesterone levels can indicate pregnancy viability but do not definitively localize the pregnancy and are less critical than immediate visualization.
- C. Quantitative β-hCG levels are crucial for monitoring pregnancy progression and correlating with ultrasound findings (discriminatory zone), but the ultrasound directly provides the most urgent information about pregnancy location.
- D. A CBC is important to assess for anemia and blood loss, but it does not confirm the location of the pregnancy and is not the immediate priority over visualizing the pregnancy.
Ectopic Pregnancy Evaluation
Assessment for a pregnancy implanted outside the uterine cavity, most commonly in the fallopian tube, which can lead to life-threatening hemorrhage.
- Classic triad: Amenorrhea, abdominal pain, vaginal bleeding.
- Transvaginal ultrasound is the primary diagnostic tool.
- Quantitative β-hCG levels are used in conjunction with ultrasound.
Memory trick: Pain, Spotting, Positive Test? Picture the Placement!