Results
Respondents represented 15 hospitals across each region of Canada (response rate=52%). Only 39.2% of respondents reported routinely measuring ASP levels, yet 53% of respondents have modified therapy from PEG to Erwinia in up to half of their patients. The most common reason for not measuring ASP levels was not knowing how to use levels clinically (25.5%). There was variation in the timing of levels and their target.