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Test Code APTTP Activated Partial Thromboplastin Time, Plasma

Secondary ID

40935

Useful For

Monitoring heparin therapy (unfractionated heparin)

 

Screening for certain coagulation factor deficiencies

 

Detection of coagulation inhibitors such as lupus anticoagulant, specific factor inhibitors, and nonspecific inhibitors

Method Name

Coagulometric (Turbidimetric)

Reporting Name

Activated Partial Thrombopl Time, P

Specimen Type

Plasma Na Cit


Ordering Guidance


The primary method for therapeutic heparin monitoring is the heparin anti-Xa assay. Order  HEPTP / Heparin Anti-Xa Assay, Plasma.



Specimen Required


Specimen Type: Platelet-poor plasma

Collection Container/Tube: Light-blue top (3.2% sodium citrate)

Submission Container/Tube: Plastic vial

Specimen Volume: 1 mL

Collection Instructions:

1. Centrifuge, remove plasma and centrifuge plasma again.

2. Aliquot plasma into plastic vial leaving 0.25 mL in the bottom of centrifuged vial.

Additional Information: Double-centrifuged specimen is critical for accurate results as platelet contamination may cause spurious results.


Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Plasma Na Cit Frozen (preferred) 30 days
  Ambient  4 hours

Reject Due To

Gross hemolysis Reject
Gross lipemia OK
Gross icterus OK

Reference Values

25-37 seconds

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 day

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information

85730

LOINC Code Information

Test ID Test Order Name Order LOINC Value
APTTP Activated Partial Thrombopl Time, P 14979-9

 

Result ID Test Result Name Result LOINC Value
APTTP Activated Partial Thrombopl Time, P 14979-9