Cbc expt Flashcards
(37 cards)
Universal precaution
Treat all body fluids infectious
Tests in CBC
Hemoglobin measurementHematocrit measurementRBC countWBC countDifferential Count
MEASURES Volume of packed red cell after centrifugation
HEMATOCRIT measurement
METHOD IN hematocrit measurement
Adam’s micromethod
materials in hematocrit measurement
capillary tube (red, blue) sealing clay/paraffin wax microhematocrit centrifuge machine microhematocrit reader
Procedure in hematocrit measurement
Fill capillary tube with blood (3/4)Seal. LabelCentrifugate. Use balancerSpin 10,000 rpm 4-5min
in hematocrit measurement, spin at what rpm and how many min
10,000 rpm 4-5min
Hematocrit NT
male- 47 +/- 7 vol% / 0.47 +/- 7 female- 42 +/- 5 vol%
Methods for hemoglobin measurement
acid-hematin method Cyanmethemoglobin method
Method for hemoglobin measurement that gives less error
Cyanmethemoglobin method
MATERIALS FOR hemoglobin measurement
0.01 N HCl Sahli’s tube (w/comparator block) Sahli’s pipette dH20 Stirring rod
PROCEDURE FOR hemoglobin measurement
Deliver 0.01N HCl into Sahli’s tube – 2markAspirate 0.02 mL bloodExpel blood into Sahli’s tubeRinse pipette with dH20-add into the tubeAdd dH20 drop by drop – comparator blockRead lower miniscus
NR hemoglobin measurement
NR: male : 14-16.5 g/100mL or 14-16.5g% 140-165 g/L female: 12-15g/100mL
Used in counting RBC, WBC, Platelet, absolute eosinophil count, sperm countWith thick cover slipImproved Neubauer Counting Chamber
hemacytometer
specific hemacytometer in the lab
Improved Neubauer Counting Chamber
of WBC in 1 cu mm of bloodDil fluid must lyze RBC
WBC count
materials for WBC count
WBC pipetteDil fluidhemacytometer
procedure for wbc count
Aspirate blood 0.5 mark. Wipe sidesAspirate RBC dil fluid up to 101 mark. Mix dil’n 1:200Discard 5-6 gttCharge counting chamberStand 5minCount RBC in HPO
materials for differential count
Blood2 slidesDifferential stainPasteur pipetteCedar wood oil
High refractive index, thereby increasing the numerical aperture of the objective lensHave specific optical and viscosity characteristics
cedar wood oil
describe cover glass used in differential count
thicker, less flexible, surface tension of the fluid will not deform them, height of the fluid is standardized
procedure for differential count
Prepare smearDry smear on flat surfaceStain smearCount 100 cells in OIO
technique used in differential count
strip differential technique
how many WBC must be counted in a smear
100
