p57

Formalin-fixed, paraffin embedded tissue block or cell block, or 1 unstained charged slide for each test requested plus 3-4 additional unstained slides cut at 4 microns. Adequate space on each slide for control tissue is required.

Can be used to differentiate between complete and partial hydatidiform molar pregnancies. Complete hydatidiform moles lack nuclear staining for p57 while partial moles and normal chorionic villi have normal staining.