7. PT/aPTT Combination Test
Table 7.1: Specifications for the PT/aPTT COAG Combo Test.
Measurement Technology Clot time, light absorbance
Result Units Second
Reference Ranges Species PT aPTT
Feline (Cat) 15 s to 21 s 90 s to 130 s
Canine (Dog) 14 s to 19 s 75 s to 105 s
Dynamic Range PT aPTT
11 s to 35 s 30 s to 200 s
Sample Type Whole blood
Sample Volume 60 µL
Sample Collection 3.2 % concentration sodium citrate tube
Sample Stability
2 hours of room temperature (
59 °F
to
86 °F
/
15
◦
C
to
30
◦
C
). Invert the tube back and forth 10 times every 10
minutes
Cartridge Stability
Do not expose cartridges in the foil pouch to direct sun-
light. Once warmed to room temperature, cartridge must
be used within that day. Do not return warmed cartridges
to the refrigerator. Use cartridges taken from the foil
pouch within 10 minutes
Storage Refrigerate at 36 °F to 46 °F/2
◦
C to 8
◦
C
Shelf Life The expiration date is printed on the pouch label
Time to results Approximately 10 minutes
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