This study was undertaken to determine whether patients with Gaucher's disease and thrombocytopenia could safely undergo invasive procedures (i.e., liver biopsy) under the coverage of the drug Deamino-D-Arginine- Vasopressin (DDAVP) and thereby avoid exposure to blood products.  The patients all received pre-procedure screening with CBC, Coagulation screen (PT, PTT, TT, Fibrinogen), LFT's, BUN & serum creatinine, and assessment of primary hemostasis by Simplate bleeding time.  All patients who met the study parameters (platelet count of 50,000 but less than 100,000; bleeding time of 10 mins.)  then received a standard infusion of DDAVP (0.3ug/kg IV over 30 mins.).  A bleeding time was then repeated l hour after completion of the DDAVP infusion.  All patients who demonstrated a shortening of bleeding time to less than or equal to 10 mins.  then underwent a liver biopsy.  Follow-up evaluation of von Willebrand factor and platelet function were subsequently obtained on all patients who received DDAVP to correlate with the response to DDAVP.