Lab Medicine Edition | CBC: White Blood Cell Count (WBC) (Leukocytosis, Leukopenia)
May 2, 2024
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Renowned Mayo Clinic Hematologist Ronald S. Go, M.D. and host Andy J. Herber, P.A.-C. dive into the complexities of interpreting white blood cell counts in the complete blood count, discussing various causes of abnormalities like allergies, medications, and infections. They explore the effects of GCSF on post-chemo patients, management strategies for leukopenia, and the critical thresholds of neutrophil counts, emphasizing the importance of cautious interpretation and consistent CBC monitoring for patients undergoing myelosuppressive chemotherapy.
Identifying predominant white cell types in leukocytosis through absolute counts aids in proper diagnosis.
Lymphopenia and monocytosis in CBC results indicate potential viral infections or chronic lymphocytic leukemia, requiring further evaluation.
Deep dives
Understanding Leukocytosis and Differentiating White Cell Types
Differentiating between elevated white cell types in leukocytosis is crucial for proper diagnosis. Dr. Ronald Go highlights the significance of looking at absolute counts rather than percentages to identify the predominant cell type. Neutrophilia is often linked to inflammatory conditions, spleen issues, or certain medications, while lymphocytosis may suggest infections like chronic lymphocytic leukemia. Monocytosis is associated with infections and chronic myelomonocytic leukemia, with a threshold for consultation set at 1.0 absolute count.
Evaluating Lymphopenia and Monocytosis in Patient CBCs
Lymphopenia and monocytosis in CBC results provide insights into potential viral infections or chronic lymphocytic leukemia. Dr. Go emphasizes considering prior CBC trends to assess the duration and nature of lymphocyte changes. For persistent monocytosis above normal levels, further evaluation for chronic myelomonocytic leukemia is advisable if counts exceed 1.0 absolute. Additionally, rare occurrences of eosinophils and basophils abnormalities prompt thorough investigation to rule out primary hematologic conditions.
Detecting Neutropenia and Managing Post-Chemotherapy Patients
Managing neutropenia in post-chemotherapy patients involves careful monitoring based on severity levels. Dr. Go outlines thresholds for neutrophil counts that warrant immediate hematologist consultation, emphasizing the distinction between benign ethnic neutropenia and acquired neutropenia triggers like medications, infections, or cancers. In post-chemotherapy scenarios, maintaining communication with hematologists and optimizing CBC frequency near treatment sessions minimizes unnecessary testing and ensures timely intervention when required.
Join our host, Andy J. Herber, P.A.-C. as he discusses the complete blood count (CBC), which is one of the most ordered laboratory tests in the primary care setting. Providers are frequently tasked with evaluating all aspects of the CBC. A keen understanding of this laboratory test is essential to providing quality care for patients. Joining us again to discuss white blood cell count abnormalities is renown Mayo Clinic Hematologist, Ronald S. Go, M.D.