What are characteristics of superimposed preeclampsia on chronic hypertension?

Updated: Nov 29, 2018
  • Author: Kee-Hak Lim, MD; Chief Editor: Ronald M Ramus, MD  more...
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Superimposed preeclampsia (on chronic hypertension) is characterized by (1) new onset proteinuria (≥300 mg/24 h) in a woman with hypertension but no proteinuria before 20 weeks' gestation and (2) a sudden increase in proteinuria or BP, or a platelet count of less than 100,000/mm3, in a woman with hypertension and proteinuria before 20 weeks' gestation.

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