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A 30-year-old previously healthy woman at 28 weeks gestation is found to have a blood pressure of 150/100 mmHg at a routine prenatal appointment. She is asymptomatic, feeling good fetal movement, fundal height is 28 cm, and the fetal heart rate is 130 bpm. Results of a complete blood count and comprehensive metabolic panel are normal. The urine protein:creatinine ratio is 0.5. The patient returns the next day and her blood pressure is again 150/100 mmHg. What is the most likely diagnosis?