Geisinger Medical Laboratories/Geisinger Proven Diagnostics Test Catalog

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


Geisinger Epic Procedure Code: LAB2429         Geisinger Epic ID: 14998

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:
Two (2) 1 mL aliquots plasma.
Special notes:
Avoid contaminating the sample with tissue thromboplastin or heparin. Venipuncture must be performed with no trauma. Hemolyzed samples (1.5 g/L or greater) are not acceptable. If blood is drawn from an indwelling catheter, flush with 5 mL of saline and discard the first 5 mL of blood collected.

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 polypropylene aliquot tube and label with patient's name and a second patient identifier (e.g., date of birth, medical record number). DO NOT REFRIGERATE but freeze immediately. Freeze upright and transport on dry ice. 
Transport temperature:
Specimen stability:
Frozen: -20°C for 30 days, -70°C for 6 months. Room temperature specimens stable off cells for two (2) hours after collection. If specimen is on cells, stability drops to one (1) hour after collection.
Rejection criteria:
Clotted specimen. Stability limits exceeded. Specimen off cells but not tested or frozen within two (2) hours of collection. Indications of thaw in transit are sample on slant in aliquot tube or in lid of tube. These samples will be run but will receive a comment of interpret results with caution as thawing suspected. To add this test to a specimen collected within 1 hour call: GMC Hematology Lab at extension 570-271-6323 or call Client Services at 1-800-695-6491.

Reference interval:
Low molecular weight heparin's therapeutic range is 0.6 - 1.0 I.U./mL. Therapeutic range estabilished by pharmacy in conjunction with laboratory.
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:
International units of heparin.
Anti-Xa Assay
Lovenox, fractionated (low molecular weight) heparin, Anti-Xa assay for low molecular weight heparin, enoxaparin, Anti Xa, HEPLMW
Clinical significance:
Used to quantitate the level of fractionated heparin in a patient's plasma.
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 Lewistown Hospital

Performing laboratory: Coagulation
Technical Lead: Lisa Sheaffer  
Frequency: Daily    
Performed stat? Yes
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