What condition develops after the 20th week of pregnancy in women with previously normal blood pressure?

The condition that develops after the 20th week of pregnancy in women with previously normal blood pressure is gestational hypertension. This condition is characterized by elevated blood pressure readings (≥ 140/90 mmHg) that occur for the first time during pregnancy, specifically after the mid-point of gestation. It is important to differentiate gestational hypertension from other hypertensive disorders of pregnancy, as it can lead to further complications if not managed properly.

Gestational hypertension can occur in women who had normal blood pressure before pregnancy and does not include any significant signs of end-organ dysfunction or proteinuria that would indicate the more severe condition of preeclampsia. With proper monitoring and management, most women with gestational hypertension do well and continue to have healthy pregnancies.