Complex sentence: The ristocetin-induced platelet aggregation (RIPA) is an ex vivo assay for live platelet function to aggregate with help of von Willebrand factor (vWF) and exogenous antibiotic ristocetin added in a graded fashion used to diagnose von Willebrand disease (vWD).
Split into simpler sentences: The ristocetin-induced platelet aggregation (RIPA) is an ex vivo assay for live platelet function. It measures platelet aggregation with the help of von Willebrand factor (vWF) and exogenous antibiotic ristocetin added in a graded fashion used to diagnose von Willebrand disease (vWD).