Geisinger Medical Laboratories/Geisinger Proven Diagnostics Test Catalog

Order Display Name: Geisinger Epic Procedure Code Or ID CPT Code:  


Geisinger Epic Procedure Code: LAB2947         Geisinger Epic ID: 31809

Specimen type:
Platelet-free plasma
Preferred collection container:
Alternate Collection Container:
Other size blue-top (3.2% sodium citrate) tubes (e.g., 1.8 mL, 4.5 mL)
Specimen required:
1 mL aliquot of plasma.
Special notes:
Do not draw blood from a heparinized line. Avoid contaminating the sample with tissue thromboplastin or heparin. Venipuncture must be performed with no trauma. If blood is drawn from an indwelling catheter, flush with 5 mL of saline and discard the first 5 mL of blood collected. If blood is drawn with a butterfly device, draw a discard tube first to remove air from tubing.

Specimen processing instructions:
If specimen will be analyzed within 24 hours: Whole blood can be submitted.
If specimen will be analyzed after 24 hours: Centrifuge the citrated blue-top tubes at designated time and speed to obtain platelet-poor plasma (<10,000/µL). Using a plastic pipette, remove 1 mL of plasma and transfer to a plastic aliquot tube and label with patient's name and a second patient identifier (e.g., date of birth, medical record number). 
Transport temperature:
If specimen will be analyzed within 24 hours, store and transport whole blood at room temperature. If specimen will be analyzed beyond 24 hours, remove plasma and freeze. Transport frozen.
Specimen stability:
Whole blood: 24 hours at room temperature.
Plasma: -20°C for 30 days, -70°C for 6 months.
Rejection criteria:
Clotted, overfilled or underfilled tubes. HCT >55. HCT > 55 requires rejection, reorder in LIS, and recollection with proper adjustment of anticoagulant.

Reference interval:
PT 11.5 - 14.6 sec. INR 0.84-1.14
Critical values/courtesy alerts:
INR greater than 4.99.
Additional information:
Anticoagulation Impact on Coagulation Tests
CPT code(s):
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.  The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Test includes:
PT seconds, INR.
Mechanical Clot-Based
INR, Protime/INR, Prothrombin Time
PT/INR with Hepasorb
Clinical significance:
Measures extrinsic clotting pathway and used to monitor warfarin therapy. Warfarin Therapeutic Ranges: INR: 2.0-3.0 conventional anticoagulation. INR: 2.5-3.5 high intensity anticoagulation
Doctoral Director(s:)
Michelle Grant DO    
Review Date: 01/11/2020

Performing Locations

Geisinger Medical Center

Performing laboratory: Coagulation
Technical Lead: Margaret Knowles-Tuchman
Frequency: Daily, all shifts
Performed stat? Yes

Geisinger Wyoming Valley Medical Center

Performing laboratory: ATL+
Technical Lead: Julia Bell    
Frequency: Daily, all shifts    
Performed stat? Yes

Geisinger Jersey Shore Hospital

Performing laboratory: Coagulation
Technical lead:    
Frequency: Daily, all shifts    
Performed stat? Yes
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