Specimen must arrive within 24 hours of draw.
Container/Tube: Light blue-top (3.2% sodium
citrate) tube
Specimen Volume: 2.5 mL of sodium citrate
plasma
Transport Temperature: Ambient
Collection Instructions: If there is a
delay in transport of ≥24 hours, spin down, separate plasma
and send specimen frozen in plastic vial.
Note: 1. Excessively high or low hematocrit will
affect results.
2. Tube must be completely filled to ensure proper ratio of blood
to anticoagulant and to avoid erroneous results.
Includes INR, which is a derived number which takes into account test system, sensitivity of reagents, and normal range of non-treated patient population. Coumadin® therapy should be adjusted using INR, rather than reported protime value.
9.4-11.4 seconds
Critical value (automatic call-back): >5.0 INR
Monday through Sunday
Available STAT
85610