Peripheral Smear Review and Bone Marrow Biopsy Correlation.

Introduction: Peripheral Blood Smear (PBS) interpretation is a useful skill for Haematology/Oncology Clinicians (HOC).

Aim: To explore practice patterns of PBS utilization for all benign haematology diagnosis in a non-simulated environment and to evaluate how it may guide the HOC in determining further work up and whether or not to perform a Bone Marrow Biopsy (BMB).

Materials And Methods: A retrospective review was conducted on 451 outpatient referrals for benign haematology diagnosis. Patient demographics and diagnostic tests were recorded. We further analysed cases in which a blood smear was ordered or reviewed. In cases with PBS review, we recorded testing ordered by the HOC.

Results: Records of 451 patients met inclusion criteria. The median age was 55 with males representing 51.9% of the cohort. Distribution of disorders were 50.6% (n = 228) erythrocyte (RBC), 25.5% (n = 114) leukocyte (WBC), 11.3% (n = 51) platelet (PLT), and 12.8% (n = 58) "other." A CBC was ordered in 82.7% of cases (373/451). A PBS was ordered in 47.4% of CBCs obtained (177/373, p<0.001). Of these, documentation occurred in 49.2% (87/177) which led to further testing 41.4% of cases (36/87). A BMB was performed in 11.5% (10/87) of cases in which a PBS was reviewed compared to 4.3% (16/373) of cases where BMB was performed without PBS review (p=.019). Of the 36 cases in which PBS review led to testing, 10 BMBs (27.8%) were performed-all of which led to specific haematologic diagnosis. A specific diagnosis was found in 43.8% (7/16) BMBs performed without prior PBS review.

Conclusion: PBS interpretation is an important skill for HOCs. Haematology/Oncology (H/O) training programs should continue to teach this skill to increase proficiency in order to help guide diagnostic evaluation of various haematologic disorders.