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HelpTest Code PTPTT Prothrombin Time (PT), International Normalized Ratio (INR) and Activated Partial Thromboplastin Time (PTT)
Performing Laboratory
Hunterdon Medical Center Laboratory
Special Instructions
Note: Specimen must be filled to ETCHED line located on the Blue top tube in order to achieve a ratio of 9 parts blood to 1 part anticoagulant.
Specimen Required
Container/Tube: Blue Top (Na Citrate)
Specimen Volume: Must be filled to Etched line located on tube
Specimen Type
Citrated Plasma
Specimen Transport Temperature
Ambient temperature.
Do not refrigerate.
Specimen Stability
| Out-patient (non-heparinized ) | Temperature | Time Frame |
| Ambient 15-25°C | 24 hours | |
| In patient (if heparinized) | Temperature | Time Frame |
| Ambient 15-25°C | 4 hours |
Reject Specimen Due To
Tube not filled properly: underfilled or overfilled.
Clotted
Hemolysis
Day(s) Test Set up
Monday through Sunday
Available STAT
Reference Values
PT: 9.0 -13.4 sec.
INR: 0.8-1.2
PTT: 25.1 - 36.5 sec.
For therapeutic ranges refer to individual tests: PT and PTT links below.
Methodology
Turbidimetric
CPT Code
PT 85610
PTT 85730