Although potentially curative, hematopoietic SCT (HSCT) is associated with significant morbidity. To improve outcomes, multicenter studies of critical illness in this patient population appear needed. To assist in the design of such studies, a survey was conducted to identify variations in care provided to critically ill pediatric HSCT patients. A survey was conducted of the highest volume pediatric HSCT centers in the United States (n=30) and Canada (n=4). One pediatric critical care medicine (PCCM) physician and one pediatric HSCT physician were surveyed at each institution. Analysis consisted of descriptive statistics. Thirty-three (29 United States/4 Canada) of 34 institutions responded. Although most HSCT units permit fluid boluses and nearly half permit some dose of dopamine, high-dose dopamine and other vasoactive infusions are rarely allowed there. Six institutions (21%) permit non-invasive ventilation on the HSCT unit. Criterion for PCCM consultation and therapies implemented before intubation vary significantly. High-frequency oscillatory ventilation and renal replacement therapy are commonly used for lung injury in patients failing conventional therapy. Variability exists in the location and type of therapy critically ill pediatric HSCT patients receive. Understanding this variability will help facilitate the design of clinical trials.