A woman is diagnosed with gestational hypertension. According to Williams Obstetrics, which of the following correctly defines hypertension in pregnancy?
- A Single reading of systolic BP 140 mmHg or diastolic BP 90 mmHg after 20 weeks
- B Systolic BP 160 mmHg or more on any one reading after 20 weeks
- C Systolic BP 140 mmHg or more, or diastolic BP 90 mmHg or more, on two occasions at least 4 hours apart after 20 weeks ✓
- D Diastolic BP 90 mmHg or more documented at two separate antenatal visits irrespective of gestational age
Correct answer: C. Systolic BP 140 mmHg or more, or diastolic BP 90 mmHg or more, on two occasions at least 4 hours apart after 20 weeks
Explanation
Hypertension in pregnancy is defined as systolic BP of 140 mmHg or more, or diastolic BP of 90 mmHg or more, on two measurements at least 4 hours apart after 20 weeks of gestation. A single elevated reading requires confirmation before diagnosis. However, a systolic BP of 160 mmHg or more, or diastolic of 110 mmHg or more, is severe hypertension and confirms severe-range pressure even on one reading, which is what makes option B tempting but incorrect for the general definition.
Reference: Williams Obstetrics, 26th ed.
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Written and medically reviewed by the StethoPrep medical team.