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Course title: Hematology (1) Course code : MLHE-201

Course title: Hematology (1) Course code : MLHE-201. Supervisor :Prof.Dr Magda Sultan Date : 7-11-2013 Outcome : The student will be able to use the automated cell counter

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Course title: Hematology (1) Course code : MLHE-201

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  1. Course title: Hematology (1)Course code : MLHE-201 Supervisor :Prof.Dr Magda Sultan Date : 7-11-2013 Outcome : The student will be able to use the automated cell counter He will know its operating mechanisms He will know the reagents ,the alarms and the interfering substances

  2. Automated cell counter

  3. Types: • * 3 part diff. (8 or 18 param.) • Light transmition • Electrical impedance • * 5 part diff (23 or 26 param) • Laser based cytometer • Light scattering

  4. 3 part diff. cell counter Counting principle - - + - - + - + + Cell in the counting chamber No particles in the counting chamber

  5. Counting principle By counting & sizing cells by detecting and measuring changes in electrical impedance when a cell (or other particle) in a conductive liquid passes through a small aperture. Cells behave as insulators so the resistance change produces a pulse between electrodes as cells pass through the aperture. The amplitude of the pulse is proportional to the cell volume

  6. Different Impedance

  7. Normal Histogram Three parts differential white blood cells: 40 to 125µ3 : lymphocytes 125 to 160µ3 : monocyte 140 to 400µ3 : granulocytes

  8. Reagents needed for cell counter Isotone solu. (dilution and basic impedance). Detergant solu. (prevent carry over and cleaning Hb cuvette). Lyse solu. (lyse RBC for WBCs & palt count). Clean solu. (end day clean). Control blood (quality assurance).

  9. Biological and mechanical alarms • Biological alarms • Assimmetry on one curve of the 3 population of cells (Blood sample abn.) • Mechanical alarm • Disturbance in the machine • No blanking • No solution • Apperture obstruction • Electricity, tubes, pump …

  10. Known interfering substance • RBCs • High WBCs esp if RBCs is low RBCs • Agglutinated RBCs   RBCs Hb Turbidity of the blood sample  Hb • Elevated WBCs • Elevated lipids • Fetal bloods

  11. MCV • Red cell agglutination •  number of large platelets HT • Red cell agglutination RDW • Agglutination of RBCs • Nutritional deficiency • Blood transfusion

  12. WBCs interferring subs. • Normoblasts  WBCs • Unlysed RBCs  WBCs • MM  WBCs (ppt protein) • Hemolysis  WBCs (red cell stroma) • Leukemia  WBCs ( cell fragility)  In CLL small lymph not counted • Cryoglobulin  all parameters of blood

  13. Lymphocytes • Nucleated RBCs  lymph • Parasites  lymph • Resistent RBCs  lymph Monocytes •  in large lymphocytes, atypical lymph, blasts and basophils Granulocytes •  in eosinophilia, blasts, promyelo, myelo, metameyl and plasma cell

  14. Platelets • RBCs fragments  plat (microcytes) • WBCs fragments  plat (microcytes) • Chemotherapy  plat ( plat. fragments) • Hemolysis  Plat (red cell strom) • ACD blood  plat (plat. Aggregation) • RBCs inclusion  plat. (Malaria, H.j bodies) • Plat. agglutination  plat

  15. Measured and calculated results Calculated results Ht %: MCV x RBCs Pt %: MPV x plat C MCH: Hb ÷ RBCs MCHC: Hb ÷ Ht RDW %: CV of RBCs Histo PDW %: CV of Pl. Histo Diff WBC 3 relative count 3 abs. count Measured results Hb g/dl RBCs / cmm MCV fL WBCs / cmm Plat count / cmm MPV fL

  16. Normal Histogram

  17. Assignment

  18. Reference book: Dacie Training Questions What are the reagents of automated cell counter ? Mention the white cell interferring substances

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