Abstract: Described herein are methods, systems and kits of the diagnosis of preeclampsia and HELLP syndrome, as well as the selection of a preeclampsia or HELLP syndrome treatment. These are based, at least in part, on the finding that proximal tubule injury, as measured by urinary KIM-1, is increased in severe preeclampsia and correlates with complement activation. The detection of complement proteins correlate with kidney injury in severe preeclampsia and/or HELLP syndrome and terminal complement blockage is a therapeutic approach taken as described in various embodiments of the present invention.