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Annals of Clinical & Laboratory Science 38:138-142 (2008)
© 2008 Association of Clinical Scientists

Technical Note

A Counting Strategy for Estimating Plasma Cell Number in CD138-Stained Bone Marrow Core Biopsy Sections

Fred B. Smith and Ashraf Elnawawi
Department of Pathology, Saint Vincent’s Catholic Medical Centers of New York–Manhattan, New York, and Department of Pathology, New York Medical College, Valhalla, New York

Address correspondence to Fred B. Smith, M.D., Dept. of Pathology, St. Vincent’s Catholic Medical Centers of New York, 170 West 12 Street, New York, NY 10011, USA; tel 212 604 1564; fax 212 604 8426; e-mail fsmith{at}svcmcny.org.

Plasma cells are readily identified microscopically after immunostaining for the CD138 antigen, and CD138-stained bone marrow core biopsy sections have proved superior to Giemsa-stained aspirate smears and hematoxylineosin (H&E) sections for determining plasma cell percentages in marrow. The CD138-stained plasma cell percentage is generally obtained by visual estimation, after viewing the entire section. We propose an alternative method, in which the microscopist initially views the immunostained section under low- and medium-power magnification, then selects a single high-power field in which the relative concentration of plasma cells appears most representative of the section as a whole, and performs a manual differential count of plasma cells in that field. On 44 CD138-stained core biopsy specimens from patients with plasma cell myeloma, selected area counting provided plasma cell percentage values that were more closely correlated with total section plasma cell area, determined by computerized image cytometry, than were visual estimates. This simple method requires only slightly more time than visual appraisal, does not require extensive training or experience, and appears to provide a more accurate estimate of the plasma cell population within the entire specimen.

Keywords: plasma cell, plasma cell myeloma, immunohistochemistry, CD138 antigen






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