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Please note that Coagulation Studies consists of the following tests :
PT (INR)
APTT
Thrombin Time (TT)
Fibrinogen
Do not use 1.0 mL citrate tubes
When blood is collected from an arterial line it is necessary to discard the first 20 mL of blood to clear any heparin from the line before collecting the blood for coagulation tests
When collection is by vacuum tube, the coagulation tube should be collected second to avoid artefactual shortening of coagulation assays due to trauma of venesection
Whe blood is collected for an APTT or Anti-Xa Assay for control of heparin or low molecular weight heparin therapy, it is essential that the citrate tube is sent immediately to the laboratory
Do not use 1 ml citrate tubes.
INR 0.8 - 1.2
APTT 26 - 34 sec
TT 18 - 24 sec
FIB 1.9 - 4.3 g/L
Fill to label marker and mix by inversion
Centrifuge and separate within 60 minutes of collection.
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