Geisinger Medical Laboratories/Geisinger Proven Diagnostics Test Catalog

Test Name: Sunquest Test Code Epic Procedure Code Or ID CPT Code:  

THROMBIN TIME

ORDERING INFORMATION:
Sunquest Test Code:
TT      Geisinger Epic Procedure Code: 85670         Geisinger Epic ID: 7224

SPECIMEN COLLECTION
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 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
Specimen processing instructions:
Centrifuge the citrated blue-top tubes as soon as possible (within 60 minutes) 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:
Frozen.
Specimen stability:
Frozen: -20°C for 30 days, -70°C for 6 months. Room temperature: 8 hours. If on heparin therapy, plasma remains stable for 2 hours at room temperature.
Rejection criteria:
Clotted specimen. Overfilled or undefilled tubes. Stability limts exceeded. HCT >55. HCT > 55 requires rejection, reorder in LIS, and recollection with proper adjustment of anticoagulant.

TEST DETAILS
Reference interval:
Varies with lot number of reagent.
Current GMC = 14.7 to 19.6 sec.
Current GWV = 14.1 - 17.3 sec.
Current GCMC = 14.5-17.5 sec.
CPT code(s):
85670
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:
Thrombin time (TT).
Methodology:
Mechanical Clot-Based
Synonyms:
TT, TcT, thrombin clot time
Clinical significance:
The thrombin clotting time is a screening test used to detect the presence of heparin, dysfibrinogenemia, or other thrombin inhibitors.
Doctoral Director(s:)
Michelle Grant DO    
Review Date: 04/29/2019

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: Amanda Mika    
Frequency: Daily, all shifts    
Performed stat? Yes

Geisinger Community Medical Center

Performing laboratory: Hematology
Technical Lead: Renee Bordo, Robert Furcon  
Frequency: Daily    
Performed stat? Yes
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*GMC - Geisinger Medical Center; GWV - Geisinger Wyoming Valley Medical Center; GSACH - Geisinger Shamokin Area Community Hospital; GBH - Geisinger Bloomsburg Hospital;
GCMC - Geisinger Community Medical Center (Scranton); GLH - Geisinger Lewistown Hospital; GHS - Geisinger Holy Spirit; GJSH - Geisinger Jersey Shore Hospital,
GSWB - Geisinger South Wilkes-Barre