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HelpTest Code APTHR Prothrombin Time, Blood
Additional Codes
LAB320
Methodology
Used as a screening procedure for extrinsic coagulation system or for the control of anticoagulant therapy.
An INR (International Normalized Ratio) is reported with every prothrombin time.The INR is a standardized value that is used word wide to monitor the therapeutic effect of oral anticoagulants.
Performing Laboratory
St. Mary's Regional Medical Center-Hematology and Coagulation
CPT: 85610
Specimen Requirements
Container/Tube: Light blue-top (sodium citrate) tube
Specimen: 2.7 mL of sodium citrate whole blood
Transport Temperature: Ambient
Specimen Stability: Stable for 8 hours at room temperature
Collection Instructions: Tube must be full. Do not centrifuge. If collected through an indwelling catheter, line should be flushed with saline and first 10 mL of blood should be discarded. Using a transfer device, immediately transfer 2.7 mL of blood to tube, and mix gently 3 or 4 times. If collected through a blood collection set (butterfly), a discard tube must first be drawn to eliminate dead space from tubing. Gently invert 3 to 4 times to mix blood. Do not uncap tube.
Reference Values
PROTIME
12.2-14.7 seconds
INTERNATIONAL NORMALIZED RATIO (INR) 0.89-1.12 IU
Therapeutic range: 2.0-3.0 IU
Day(s) Test Set Up
Monday through Sunday
Available STAT