PathWays Case Study: April 25

​A 60-year-old woman presented with 2 years of progressive transfusion-dependent anemia. CBC was as follows: Hb 10.4 g/dL (ref 12-15.5), MCV 94.8 fL (ref 81.6-98.3), RDW 17.7% (ref 11.9-15.5), WBC 4.4x109/L (ref 3.5-10.5), Plt 135x109/L (ref 150-450), reticulocytes 4% (ref 0.77-2.36). Erythropoietin was 55.9 mIU/mL (ref 2.6-18.5), and ferritin was 199 mg/L (ref 11-307). The clinician ordered a bone marrow biopsy and myeloproliferative neoplasm workup. The following calreticulin variant was identified by fragment analysis (Figure 1) and next generation sequencing (Figure 2).

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Jadee Neff, M.D., Ph.D.
Fellow, Molecular Genetic Pathology
Mayo Clinic



Rong He, M.D.
Consultant, Division of Hematopathology
Mayo Clinic
Assistant Professor of Laboratory Medicine and Pathology
Mayo Clinic College of Medicine and Sciences

April Josselyn (@apriljosselyn)

April Josselyn

April Josselyn is a Marketing Channel Manager at Mayo Clinic Laboratories. She has worked at Mayo Clinic since 2012. Outside of work, April enjoys the outdoors and being "hockey mom" for her two sports-crazed boys.