rbc method --2

1. RBC Methodologies-II
BOND KING

2. I.Erythrocyte sedimentation rate(ESR)
 Rate of settling of RBC from the plasma after the addition
of anticoagulant.
Importance of ESR
1. Good index for the presence of hidden carcinoma but
active diseases.
2. It measures the suspension stability of RBC.
3. It measures the abnormal concentration of fibrinogen
and serum globulin.
Roleaux formation
(Packing or piling of RBC)

3. Methods
A.Wintrobe and landsberg method
 Anticoagulant used- Ammonium potassium oxalate
(wintrobe solution/ double oxalate/balanced oxalate/
paul-Heller’s soln.)
 Tube – wintrobe tube
- Left side – red; 0 on top and 10 cm bottom.
- Right side – white; 10 cm top and 0 bottom.

4.  Procedure
1. With a long stem pasteur pipet, fill the wintrobe tube
with oxalated blood up to 0 mark.
2. Let the wintrobe tube stand perfectly vertical.
3. Read result after 1 hour. Reading must be done on the
left red side of the tube.
Normal values
 Male - (0-9) mm/hr
 Female - ( 0-20 )mm/hr ( bcg less RBC )
 Children- (1-13) mm/hr

5. Red White
0 10
Layers
-Plasma layer
-Buffy coat (WBC and platelets)
-Packed RBC (hematocrit)
Wintrobe
tube
Red cells
at bottom 0 at bottom
10

6.  Females have more space in settle down and faster than
male and children because they have less RBC.
( 1cm – 10mm/hr)
B.Westergren method (200mm) – most sensitive and
most accurate .
- Anticoagulant used -3.8% sodium citrate
- Tube- westergren tube (through suction method long
tube)

7. 200 mm
0

8. Procedure
1. Fill the tube with the citrated blood
2. Stand the tube vertically and read result at the end of the
1st hrs. and 2nd hrs.
Normal values
 Male – (3-5) mm/hr
7-15 mm/2hr
 Female – (4-7) mm/hr
12-17 mm/2hr

9. Comparision
Wintrobe Wester gren
Bore 3 mm 2.5 mm
Graduation up to 100 mm up to 200 mm
Anticoagulant Double oxalate 3.8% sodium
citrate
Amount of 1 ml 2.4 ml
blood
Reading once Twice
Hematocrit

10. C. Graphic cutler
Anticoagulant – 3.8% sodium citrate
D. Linzenmeier
Anticoagulant – 3.8% sodium citrate
E. Roarke- Ernstiene
Anitocagulant – Heparin
F. Bray’s
Anticoagulant- 3.8% sodium citrate

11. G. Micro methods
1) Micro landau
 Anticoagulant- 5% sodium citrate
2) Smith micro
 Anticoagulant- 5% sodium citrate
3) Crista or hellige- vollmer
Stages of ESR
1. Initial rouleaux formation – (first 10 min)
2. Period of rapid settling – (next 40 min)
3. Period of final settling – (last 10 min)
total 60 minutes or 1hr.

12. Factors in ESR
1. Intrinsic Factor
- nos of RBC ( less RBC faster settlement)
- size of RBC ( Bigger the size is faster the settlement)
- viscosity of Plasma ( less viscous fast settlement)
* nos of RBC- inversely
* size of RBC- directly

13. 2. Extrinsic factor
 Length of tube ( smaller length fast settlement)
 Diameter of tube (wider diameter fast settlement)
 Position of tube(vertical or slightly fast settlement
 Temperature ( high temp. fast settlement)
 Pipetting ( incorrect pipetting result error)
 Volume of blood ( less blood faster settle.)
 Anticoagulant (more anticoagulant slow settlement)

14. II Osmotic fragility test
 Test the stability of RBC in hypotonic solutions.
 Follows the law of osmosis.
 Factor affecting OFT
- Red cell shape
- Red cell volume
- Red cell surface Area
- State of Red cell membrane
*Fragile cells( decrease)- spherocytes
*Resistant cells( increase)- sickle cell , target cell,
reticulocytes

15. Methods
1. Sanford method
 Different conc. Of hypotonic solution
 12 test-tube is used
 Initial solution used – 0.5% Nacl
Interpretation
 No hemolysis – tubes with compact sediment and clear
solution.
 Initial hemolysis -1st tube from the left with not so
compact sediment and with dark red solution
 Complete hemolysis - 1st tube from the left without
sediment and with dark red solution.

17. Normal values
 Initial hemolysis- tube 22
 Complete hemolysis- tube17
Increase OFT
 Initial hemolysis- tube 24 ( increased-hemolytic anemia ,
hereditary spherocyte)
 Complete – tube 20 { decrease-sickle cell anemia,
thalassemia , jaundice, SIDA(severe ion deficiency
Anemia)}.
Decreased OFT
 Initial hemolysis-tube 19
 Complete hemolysis-tube 15

18. 2. Modified Sanford – in terms of ml

19. 3. Griffin and Sanford method
4. Dacies method
 Hemolysis read is used through spectrophotometer.
(Transparent – fake pink- light pink- red)

20. III.Erythrocyte Indices
 Important in assessing borderline types of anemia.
 Computed using 3 determinants Hb, hematocrit and RBC
count.
A. Mean corpuscular volume (MCV)
 Average volume of an individual RBC.
volume % Hct x 10 = cubic micra or femtoliter
RBC in millions
 Normal value- 82- 92 cubic micra.

21. Interpretation
 95- 160 cubic micra- macrocyte
 72-79 cubic micra – microcyte
 50-71 cubic micra – microcyte hypochromic
(less Hb)
Example
Hct = 46 vol %
RBC count – 5,000,000/ cumm
MCV= 46 x 10 = 92 cubic micra
5

22. B. Mean Corpuscular Hemoglobin (MCH)
 Ratio of Hb to red cell count
 Average weight or amount of Hb in an individual RBC in
millions
gm Hb x 10 = uug or picogram
RBC in million
 Normal value – (27-33) uug
Interpretation
> 33 uug- macrocyte
< 27uug – microcyte
< 22 uug – microcytic hypochromic
Example
Hb = 16gm/100ml
RBC count = 5,500,000/cumm
MCH= 16 x 10 = 29 uug
5.5

23. C. Mean corpuscular hemoglobin conc.(MCHC)
 Mean conc. Of Hb in the average RBC.
Normal Value = 32-38%
 Average weight or amount of Hb in an individual RBC
gm Hb x 100 = %
vol. % Hct
Example
Hb -16 gm/ 100ml
Hct = 46 vol. %
MCHC = 16 x 1000 = 34.7%
46

24.  Normal – normochromic
 < 32 – hypochromic
 > 38 – hyperchromic