Catheter-related thrombus, anti-Xa activity, bleeding, heparin-induced thrombocytopenia, filter lifespan, length of stay, ventilator free days, and mortality. We will monitor neutrophil gelatinase-associated lipocalin levels and urine volume to determine whether they can be used as prognostic factors for renal recovery. The gene discussed is LCN2; the disease is Thrombocytopenia.