Claim: Pre-eclampsia, a risk factor for Placental abruption (typical onset: 24 to 26 weeks of pregnancy), is characterized by high blood pressure.
Evidence: Pre-eclampsia is a disorder of pregnancy characterized by the onset of high blood pressure and often a significant amount of protein in the urine. 24 to 26 weeks of pregnancy Smoking, preeclampsia, prior abruption 
Risk factors include smoking, pre-eclampsia, prior abruption, trauma during pregnancy, cocaine use, and previous cesarean section. 24 to 26 weeks of pregnancy High blood pressure, protein in the urine