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Test ID APTTB Activated Partial Thromboplastin Time (APTT), Plasma


Necessary Information


Heparin or Coumadin therapy should be noted.



Specimen Required


Only orderable as part of a coagulation consultation. For more information see 1 of the following:

LUPPR / Lupus Anticoagulant Profile

BDIAL / Limited Bleeding Diathesis Profile

THRMP / Thrombophilia Profile

PROCT / Prolonged Clot Time Profile 


Useful For

Screening for certain coagulation factor deficiencies and abnormalities (eg, factor VIII, IX, XI or XII)

 

Detecting coagulation inhibitors such as lupus anticoagulant, antiphospholipid antibodies, specific factor inhibitors, and nonspecific inhibitors

 

Evaluating a prolonged APTT test result to assist in differentiating coagulation factor deficiencies from coagulation inhibitors, especially when the activated partial thromboplastin time (APTT) mixing test results are combined with results of other coagulation tests and clinical information .

 

Monitoring heparin (unfractionated) therapy

Method Name

Optical Clot-Based

Reporting Name

Activated Partial Thrombopl Time, P

Specimen Type

Plasma Na Cit

Specimen Stability Information

Specimen Type Temperature Time
Plasma Na Cit Frozen 14 days

Reference Values

Only orderable as part of a coagulation consultation. For more information see 1 of the following:

LUPPR / Lupus Anticoagulant Profile

BDIAL / Bleeding Diathesis Profile

THRMP / Thrombophilia Profile

PROCT / Prolonged Clot Time Profile  

 

26-36 seconds

The normal full-term newborn activated partial thromboplastin time (APTT) may be up to 35% longer than in adults and even longer (up to twice the adult upper limit) in healthy premature infants. Typically, the APTT is in the adult reference range by age 3 months in healthy full-term infants and by age 6 months in healthy premature infants (30-60 weeks gestation.)

An interpretive report will be provided.

 

See Pediatric Hemostasis References.

Day(s) and Time(s) Performed

Monday through Friday

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been cleared or approved by the U.S. 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.

LOINC Code Information

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

 

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