Careful morphologic review of blood smears is a crucial first step in the diagnostic workup of an abnormal WBC differential, explains Dr. Olga Pozdnyakova in this CAPcast interview. Dr. Pozdnyakova, along with Dr. Kyle Bradley, will be teaching a course on this topic at CAP20, which will be held virtually Oct. 10-14. For more information and to register: https://www.capannualmeeting.org.