4. Type of WBC’s
Granulocytes—have large
granules in their cytoplasm
Neutrophils( 40 to 75%)
Eosinophils(1 to 6%)
Basophils(0 to 1%)
5.
6. Types of WBC’s
Agranulocytes—do not have
granules in their cytoplasm
Lymphocytes(20 to 40%)
Monocytes( 2 to 10%)
7.
8. Granuloctyes
Neutrophils
Stain light purple with neutral dyes
Granules are small and numerous—course
appearance
Several lobes in nucleus
65% of WBC count
Diapedesis,inflammation
9.
10. Granulocytes
Eosinophils or Acidophils:
Large, numerous granules
Nuclei with two lobes
2-5% of WBC count
Found in lining of respiratory and digestive tracts
Protections against infections caused by parasitic
worms and involvement in allergic reactions
Secrete anti-inflammatory substances in allergic
reactions
11.
12. Basophils
Least found- 0.5 to 1%
Contain histamine,serotonin,heparin—
inflammatory chemical
13.
14. Agranulocytes
Lymphocytes
Smallest WBC
Large nuclei/small amount of cytoplasm
Account for 25% of WBC count
Two types—T lymphocytes—attack an
infect or cancerous cell,
B lymphocytes—produce antibodies
against specific antigens (foreign body)
19. WHITE CELL COUNT (WBC)
White cell count (WBC) is the total number of leukocytes in a
volume of blood, expressed as thousands/µl.
WBC can be done by manual methods or by automated cell
counters.
Normal Values:
• Newborn 9.0-30.0 x 103/μl
• 1 week 5.0-21.0 x 103/μl
• 1 month 5.0-19.5 x 103/μl
• 6-12 months 6.0-17.5 x 103/μl
• 2 years 6.2-17.0 x 103/μl
• Child/adult 4.8-10.8 x 103/μl
20. PRINCIPLE OF WBCS COUNT TEST
Free-flowing capillary or well-mixed anticoagulated
venous blood is added to a diluent) at a specific volume in
the thoma pipette.
The diluent lyses the erythrocytes but preserves
leukocytes and stains the nuceli.
The diluted blood is added to the hemacytometer
chamber.
21. Specimen:
EDTA- anticoagulated blood or capillary blood is
preferred.
Reagents, supplies and equipment:
White blood cells count diluting fluid
Turks' solution which is formed of:
Glacial acetic acid 3 ml
Crystal violet 1 ml
100 ml distilled water.
22. EQUIPMENT
1. White blood cells count diluting fluid
2. Thoma white pipette
3. Hemacytometer and coverslip
4. Microscope
5. Lint-free wipe
6. Alcohol pads
24. HEMACYTOMETER
The hemacytometer counting chamber is used for cell
counting.
It is constructed so that the distance between the bottom of
the coverslip and the surface of the counting area of the
chamber is 0.1 mm.
The surface of the chamber contains two square ruled areas
separated by an H-shaped moat.
26. PROCEDURE
1. Draw the blood up to 0.5 mark in the thoma
pipette.
2. Wipe the outside of the capillary pipette to
remove excess blood that would interfere with
the dilution factor.
3. Holding the pipette almost vertical place into the
fluid. Draw the diluting fluid into the pipette slowly
until the mixture reaches the 11 mark, while
gently rotating the pipette to ensure a proper
amount of mixing.
4. Place the pipette in a horizontal position and
firmly hold the index finger of either hand over
the opening in the tip of the pipette, detach the
aspirator from the other end of the pipette now
the dilution of the blood is completed
27. PROCEDURE
5. Mix the sample for at least 3 minutes to facilitate
hemolysis of RBCs.
6. Clean the hemacytometer and its coverslip with an
alcohol pad and then dry with a wipe.
7. Before filling the chamber, discard the first four to
five drops of the mixture on apiece of gauze to expel
the diluent from the stem.
28. PROCEDURE
8. Carefully charge hemacytometer with diluted
blood by gently squeezing sides of reservoir to
expel contents until chamber is properly filled.
29. PROCEDURE FOR COUNTING WBC’S
1. Under 10 x magnifications, scan to ensure even
distribution. Leukocytes are counted in all 4 large
squares of counting chamber.
2. Count cells starting in the upper left large corner
square. Move to the upper right corner square,
bottom right corner square, bottom left corner square
and end in the middle square.
3. Count all cells that touch any of the upper and left
lines, do not count any cell that touches a lower or
right line.
34. DEFINITION
The relative percentage of each
type of white blood cells in
peripheral blood.
This experiment is a part of blood
routine test.
35. PERIPHERAL BLOOD SMEAR
A properly prepared blood smear is
essential to accurate assessment of cellular
morphology
The wedge smear is the most convenient
and commonly used technique for making
PBS
36. PERIPHERAL BLOOD SMEAR
Wedge technique of making
PBS
A. Correct angle to hold
spreader slide
B. Blood spread across width
of slide
C. Completed wedge smear
37. PERIPHERAL BLOOD SMEAR
Characteristics:
It is smooth without
irregularities, holes, or
streaks
When the slide is held
up to light, the
featheredge of the
smear should have a
“rainbow” appearance
The whole drop is
picked up and spread
Well-made PBS
41. Observing direction:
Observe one field and record the number of WBC according to
the different type then turn to another field in the snake-liked
direction
*avoid repeat or miss some cells
42. ROMANOWSKY STAINING
Leishman's stain : a polychromatic stain
• Methanol : fixes cells to slide
• methylene blue stains RNA,DNA
blue-grey color
• Eosin stains hemoglobin, eosin granules
orange-red color
• pH value of phosphate buffer is very important
42
43. PROCEDURE
• Thin smear are air dried.
• Flood the smear with stain.
• Stain for 1-5 min.
• Experience will indicate the optimum time.
• Add an equal amount of buffer solution and mix the stain by blowing
an eddy in the fluid.
• Leave the mixture on the slide for 10-15 min.
• Wash off by running water directly to the centre of the slide to prevent
a residue of precipitated stain.
• Stand slide on end, and let dry in air.
43
44. FEATURES OF A WELL-STAINED PBS
Macroscopically: color should be pink to purple
Microscopically:
RCS: orange to salmon pink
WBC: nuclei is purple to blue
cytoplasm is pink to tan
granules is lilac to violet
Eosinophil: granules orange
Basophil: granules dark blue to black
44
45. Optimal Assessment Area:
1. RBCs are uniformly and singly distributed
2. Few RBC are touching or overlapping
3. Normal biconcave appearance
45
46. PRINCIPLE
White Blood Cells
1. Check for even distribution and estimate the number
present (also, look for any gross abnormalities present on
the smear).
2. Perform the differential count.
3. Examine for morphologic abnormalities.
46
MANUAL DIFFERENTIAL
47. Red Blood Cells, Examine for :
1. Size and shape ( Anisocytosis,Poikilocytosis
2. Relative hemoglobin content.
3. Polychromatophilia.
4. Inclusions.
5. Rouleaux formation or agglutination
47
48. WBC ESTIMATION UNDER 40X
• Using the × 40 high dry with no oil.
• Choose a portion of the peripheral smear where there is
only slight overlapping of the RBCs.
• To do a WBC estimate by taking the average number of
white cells and multiplying by 2000.
48
49. PLATELET ESTIMATION UNDER 100X
1. Use the oil immersion lens estimate the number of
platelets per field.
2. Look at 5-6 fields and take an average.
3. Multiply the average by 20,000.
4. Note any macroplatelets.
49
50. Platelets per oil immersion field (OIF)
1) <8 platelets/OIF = decreased
2) 8 to 20 platelets/OIF = adequate
3) >20 platelets/OIF = increased
50
51. MANUAL DIFFERENTIAL COUNTS
• These counts are done in the same area as WBC and platelet
estimates with the red cells barely touching.
• This takes place under × 100 (oil) using the zigzag method.
• Count 100 WBCs including all cell lines from immature to
mature.
Reporting results
• Absolute number of cells/µl = % of cell type in differential x
white cell count
51
60. LYMPHOCYTOSIS
Absolute lymphocyte count more than upper limit of
normal for age( 4000/uL in adults,>7200/uL in
adolescents,>9000/uL in children and infants)
Causes
Infections-
Viral- acute infectious
lymphocytosis,neoatitis,CMV,rubella,mumps,varicell
a
Bacterial- pertussis,TB
Protozoal- toxoplasmosis
62. PLATELETS
Small,1 to 3 um in diameter,purple structures with
tiny irregular projections on surface
Occur in clumps
Pseudothrombocytopenia
Platelet sateletism