A 36-year-old male presented to the clinic for routine warfarin monitoring. Blood was drawn for prothrombin time testing. In the lab, a medical technologist noted that the volume of packed red cells appeared higher than normal. The estimated hematocrit value was 57% (reference interval = 38.8% - 50.0%). A review of past hematology results for the patient showed that his hematocrit had been increasing over the past nine months.
This quiz is no longer available. ![]() |
Kendall Cradic, Ph.D. Fellow, Clinical Chemistry Mayo Clinic Assistant Professor of Laboratory Medicine and Pathology Mayo Clinic College of Medicine |
![]() |
Nikola Baumann, Ph.D. Consultant, Clinical Core Laboratory Services Mayo Clinic Assistant Professor of Laboratory Medicine and Pathology Mayo Clinic College of Medicine |