CritiCall Ontario Image CritiCall Ontario offers a 24-hour-a-day emergency referral service for physicians across Ontario. This service facilitates medical advice and patient referrals for emergent, urgent and critically ill patients. In addition, CritiCall Ontario supports Critical Care Services Ontario by collecting and analyzing data from the Critical Care Information System (CCIS), the province’s comprehensive database of critical care statistics and information. For more information, please visit the CritiCall Ontario website.​