Do you have to have high blood pressure to have preeclampsia or hellp?

Yes, a criteria: Preeclampsia is clinically defined as hypertention and proteinuria (protein in urine) with/out edema occuring after 20 wks of pregnancy. So, hypertention is a required component for the diagnosis. Help is severe preeclampsia involing hemolytic anemia, liver dysfuctions, and low platelet count. These are very important illnesses and follow-up with doc asap/regularly is strongly advised...Good luck.