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PA21.1-6 | Welcome to Blood Grouping, Crossmatch & Autologous Transfusion
Learning Objectives
- Perform and interpret forward (cell) and reverse (serum) blood grouping correctly, resolving any discrepancy between the two.
- Describe the three methods of blood grouping — slide, tube, and gel-card — and state which is most reliable.
- Explain the purpose, phases (immediate-spin and AHG), and result interpretation of a major crossmatch.
- Distinguish major from minor crossmatch and identify the critical safety role of each.
- Identify common sources of error in blood grouping and crossmatching (clerical, weak D, rouleaux, cold agglutinins).
- Define autologous transfusion, list its three types, and state its key advantages, indications, and contraindications.
INSTRUCTIONS
Blood grouping and crossmatching are the final safety barriers between a patient and a potentially fatal transfusion reaction. This practical-skills module walks you through the bench technique step by step, explains the logic behind forward and reverse grouping, and takes you into the crossmatch — the critical pre-transfusion compatibility test. You will also learn about autologous transfusion, an elegant strategy that sidesteps many of the risks of allogeneic blood. Master this module before the blood-bank practical, as every step maps directly to PA21.6 and PA21.5 of your NMC curriculum.
References
- Robbins & Kumar: Basic Pathology, 11th ed., Ch 14 (Transfusion Medicine) (textbook)
- Harmening: Modern Blood Banking and Transfusion Practices, 7th ed., Ch 6–7 (textbook)
- AABB Technical Manual, 20th ed., Chapter on Pre-transfusion Testing (textbook)
Version 2.0 | NMC CBUC 2024