Clinicians' self-reported likelihood of referral to a hematologist of patients presenting with various severities of thrombocytopenia and bleeding symptoms. The bars represent responses of 84 primary care clinicians who responded to questions describing a 35-year-old woman with thrombocytopenia and either no bleeding or bruising symptoms, mild bleeding symptoms (minor bruising and prolonged menstrual periods; mild petechiae on her ankles and legs), or moderate bleeding (blood blisters in her mouth and gum bleeding). For each patient scenario, the clinicians were asked, “How likely are you to send her to a hematologist?” and given 4 possible answers from which to choose: very likely, likely, unlikely, and very unlikely. For this figure, very likely and likely were combined; unlikely and very unlikely were also combined.