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**Overview**: Total WBC Count Differential Count Panel**Introduction**: The Total WBC Count Differential Count Panel is a diagnostic tool designed for hematological assessment using whole blood samples. In India, leukocytosis/leukopenia affects millions annually (infections, inflammation, leukemia, nutritional deficiencies), with differential count essential for distinguishing bacterial/viral/parasitic causes, allergies, or hematologic malignancies. High morbidity from under-testing in rural/low-SES patients with fever, fatigue, or recurrent infections, limited hematology labs, delayed targeted therapy leading to sepsis, misdiagnosis, or progression of leukemia. Per hematology practices aligned with ICMR and Indian Society of Haematology & Blood Transfusion guidelines, the test employs microscopy/flow cytometry for total WBC count, neutrophils, lymphocytes, monocytes, eosinophils, basophils, absolute counts, peripheral smear, blast cells, promyelocytes, and metamyelocytes over 1â€"2 days with high accuracy, valuable for infection/inflammation profiling and leukemia screening. This diagnostic falls under hematological screening and targets patients with fever, anemia, or suspected malignancy, addressing accurate detection to guide antibiotics, antivirals, or bone marrow biopsy. With elevated morbidity due to underdiagnosis, the test supports public health efforts by enabling precise WBC profiling and reducing infectious/hematologic burden. Its whole blood-based approach ensures reliable cellular differential analysis.**Other Names**: WBC Diff Pnl.**FDA Status**: FDA approved, CLIA certified for hematology, compliant with 2025 standards.**Historical Milestone**: Automated/manual differential standard; in India, core of fever workup.**Purpose**: The test assesses 15 parameters including total WBC count to guide hematological disorder screening, detect shifts/infection/malignancy, inform therapy.**Test Parameters**: 1. Total WBC Count, 2. Neutrophils, 3. Lymphocytes, 4. Monocytes, 5. Eosinophils, 6. Basophils, 7. Absolute Neutrophil Count, 8. Absolute Lymphocyte Count, 9. Absolute Monocyte Count, 10. Absolute Eosinophil Count, 11. Absolute Basophil Count, 12. Peripheral Smear, 13. Blast Cells, 14. Promyelocytes, 15. Metamyelocytes.**Pretest Condition**: No fasting required; patients should have fever or hematologic symptoms.**Specimen**: 3 mL EDTA whole blood, transported within specified times to maintain cell viability.**Sample Stability at Room Temperature**: 24 hours with proper handling to preserve cell morphology, ensuring reliable test performance.**Sample Stability at Refrigeration**: 48 hours at 2-8 degrees Celsius, suitable for short-term storage before laboratory processing, though immediate testing is preferred.**Sample Stability at Frozen**: Not frozen (fresh sample preferred for hematology).**Medical History**: Patients should provide details on fever, fatigue, bleeding.**Consent**: Written informed consent is required, detailing the test's purpose, potential risks of undetected hematologic disorder including leukemia/sepsis, benefits of screening, and minimal discomfort from blood draw.**Procedural Considerations**: The test involves sample processing using microscopy/flow cytometry by trained personnel to ensure sterile technique and interpret results within 1â€"2 days using provided controls. Laboratories must maintain a controlled environment, adhere to quality assurance protocols.**Factors Affecting Result Accuracy**: Delays beyond stability periods, improper storage conditions, or clotted sample can affect results. Correlation with clinical evaluation or additional testing is recommended to confirm findings.**Clinical Significance**: Neutrophilia indicates bacterial infection; lymphocytosis viral/lymphoma; blasts leukemia, necessitating specialist input.**Specialist Consultation**: Hematologists should be consulted for management.**Additional Supporting Tests**: Bone marrow biopsy, culture for confirmation.**Test Limitations**: Requires fresh sample; comprehensive approach required.**References**: Indian Journal of Hematology 2024, Hematological Studies India 2023. |
