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HelpTest Code PT Prothrombin Time
Additional Codes
LAB320
Special Collection Instructions
Properly filled 9:1 ratio (blood to anticoagulant); 3.2% NaCitrate tube
Collection Method
Venous Draw; properly filled 9:1 ratio (blood to anticoagulant)
Minimum Volume
0.5 ml of plasma from a properly filled 1.8 mL or 2.7 mL NaCitrate (light blue) tube
Container
Light Blue Sodium Citrate
Acceptable Specimens
2.7mL Lt. Blue (3.2% NaCitrate)
1.8 mL Lt. Blue (3.2% NaCitrate) tube
Reference or Target Ranges
11.5-15.2 seconds
Reportable Units
Seconds
Critical Value
INR ≥ 6.0
Reasons for Rejection
| Hemolysis Threshold | N/A |
| Icterus Threshold | N/A |
| Lipemia Threshold | N/A |
| Interfering Subtances/Other | Short draws, over draws, clotted, improperly labeled |
Specimen Stability
| Ambient | Plasma – 4 hours |
| Refrigerated (4°C to 8°C) | N/A |
| Frozen(-70°C to -20°C) | 2 Weeks@ -20°C; 1 year @ -70°C |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time | Routine: within 4 hours of arrival to lab Stat:within 1 hour of arrival to lab |
| Stat Availability | Yes |
| Performing Bench | CPH Coagulation |
| Methodology/Method Description | Stago STA Compact MAX |
CPT Codes
85610
Last review/edit date
March 2024