Prothrombin Time
| Label Mnemonic: | PT |
| Epic code: | LAB320 |
| Downtime form: | Doctor/Provider Orders - Pathology Core and Specialty Care Nursery |
Hemostasis/Thrombosis
6240 RCP
356-3573
6240 RCP
356-3573
Specimen(s):
Plasma More information
Collection Medium:
 |
| Light Blue top tube 1.8 mL (Na Citrate) |
Minimum:
Full draw; 1.8 mL light blue top (mix well). Tube must be at least 90%
full.
Rejection Criteria:
Short drawn tube, clot, traumatic tap (excessive hemolysis).
Turn Around
Time:
1 hour (upon receipt in laboratory)
Reference Range:
9-12 seconds
INR Critical Reference Value: greater than 3.9
INR Critical Reference Value: greater than 3.9
Comments:
The INR corresponding to the PT is reported to assist in the
monitoring of oral anticoagulants. Must be drawn swiftly with a clean
venipuncture (no hematoma). Time drawn must be indicated on
requisition. A PT can be performed on a sample if it is kept unopened
and uncentrifuged at room temperature to be delivered to lab within 12
hours. A special tube from the lab is necessary if the hematocrit is
over 55%.
Prothrombin Time may be performed on the same collection tube as Activated Partial Thromboplastin time (aPTT) and Fibrinogen.
This test is also performed in the Iowa River Landing (IRL) clinical laboratory (for specimens drawn at that site).
Prothrombin Time may be performed on the same collection tube as Activated Partial Thromboplastin time (aPTT) and Fibrinogen.
This test is also performed in the Iowa River Landing (IRL) clinical laboratory (for specimens drawn at that site).
Methodology:
Optical clot detection.
CPT Code:
85610
See also:
Activated Partial Thromboplastin Time (aPTT), Plasma
Activated Partial Thromboplastin Time (aPTT), Plasma