Week 3-6 Blood Flashcards
Blood group antigen
On putter surface of erythrocytes membrane
Important for transfusion
Antibody
-present in serum
-natural antibodies-> anti-A, antiB appear 2-8months after birth
-immune antibody -> anti D ( present only, when organism is already met with the antigen
-IGM cannot cross placenta
Bleeding time material
*antiseptic solution
*hypodermic needle
*tissue
*stop watch
Bleeding time procedure
- clean-puncture- blot the blood -no bleeding stop the watch
Bleeding time evaluation
normal and patho
Normal:2-3mins
Patho:more than 5mins
Clotting time material
Same as bleeding time
Watch glass
Glass rod
Water bath 37 degree
Clotting time procedure
*4-5drops of blood on watch glass
*waterbath
*glassrod every 20 sec
* stop the watch when 1st fibrin fivér appear
Evolution of clotting time
Normal:5-10 mins
Prothrombin time
-the time needed prothrombin-thrombin -fibrin time
-extrinsic pathway Bitamin k and ca2+
Procedure of prothrombin time
- place watchglass and reagent thromboplastin-Ca2+ into water bath
- 0.1 ml citrated plasma onto watch glass
-0.2 ml reagent into plasma sample
-dip the glass rod 2 times/sec
Normal: 13-22sec
Prothrombin index(quick index)
Prothrombin index (%)= (prothrombin time of standard plasma (sec)/prothrombin time of sample(sec))*100
Normal range 70-120%
International Normalized Ratio
INR=(PTsample/PTstandard)squareISI
Normal range 0.8- 1.2
Higher INR, lower Quick index
Risk of Bleeding
Lower INR higher Quick index
Risk of thrombosis
Hematocrit mean
The ratio of volume of fundaments to the volume of the whole blood
Hemotocrit material
Heparin coated capillary
Plasticine
Centrifuges
Antiseptic
Needle
Blood
Hematocrit procedure
Blood-filled the capillary-seal with plasticine-centrifuge 10-20000RPM for 3-10mins