Clinical Pathology Flashcards
Problems with a slow bleed
Platelet clumping
Coagulation
Patient stress
Low BP can lead to a slow bleed
Problems with a fast bleed/ high suction
Haemoloysis (cell distortion)
Possible vein collapse
Possible pain
Serum is derived from?
Clotted blood
How is a sample mixed?
Inverted
Microscope powers
10x
40x
100x
1000x
FNA
Fine needle aspirate
Cytology slide
Patient ID
Exact site
Date
Are all slides stained inhouse ?
No
Cell layer thickness cytology slide:
Thin
How many 1 sec dips in diff quik
5
Label parts of sample after 30 mins
- plain tube
- EDTA tube
Plain tube: serum & clotted RBC
EDTA: plasma, buffy coat (WBC, platelets), red cells
What is found in plasma but is not found in serum?
Fibrinogen
Microscopic fibre formed when blood clots:
Fibrin
Why do we separate blood from clot for long term storage ?
To prevent chemicals leaching out of old and damaged cells
Prac methods of separating serum from clot:
Using pipette to siphon off serum
Serum separator tube (SST)
Most versatile anticoagulant
Heparin
Best anticoagulant for blood smears in mammals
EDTA
Use of citrate (blue) and flox (grey) tubes:
Citrate (blue): coag studies
Flox (grey): delayed glucose testing
What happens if serum is centrifuged before clot retraction occurs?
Serum will become a solid fibrinous gel because platelets are spun out before they have contracted fibrin in clot
Where should a sample be left for clotting ?
Room temp for 30mins
SST
- inverted?
- storage?
- centrifuged?
- sample?
Inverted 5 times
Left at room temp to clot
Spun down after 30 mins
Serum poured off within 60 mins
Which blood cells are responsible for clot retraction/ contraction?
Platelets (thrombocytes)
Why is it best to fast an animal before collecting blood?
Lipemia
Parts of blood smear
RBC (erythrocytes)
Platelets (thrombocytes)
Microhaematocrit tube
Plasma
Buffy coat (WBC, platelets)
Red cells
Anaemic dog and cat PCV
Dog <37%
Cat <30%
Healthy dog and cat PCV
Dog 45%
Cat 35%
Healthy dog TPP
70g/l