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


Necessary Information


Heparin or warfarin therapy should be noted.



Specimen Required


Only orderable as part of a profile or as a reflex. For more information see:

ALUPP / Lupus Anticoagulant Profile, Plasma

ALBLD / Bleeding Diathesis Profile, Limited, Plasma

AATHR / Thrombophilia Profile, Plasma and Whole Blood

APROL / Prolonged Clot Time Profile, Plasma

ADIC / Disseminated Intravascular Coagulation/Intravascular Coagulation and Fibrinolysis (DIC/ICF) Profile, Plasma


Secondary ID

602172

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

 

Monitoring heparin (unfractionated) therapy

Specimen Type

Plasma Na Cit

Specimen Stability Information

Specimen Type Temperature Time
Plasma Na Cit Frozen 14 days

Reject Due To

Gross hemolysis Reject
Gross lipemia Reject
Gross icterus Reject

Reference Values

Only orderable as part of a profile or as a reflex. For more information see:

ALUPP / Lupus Anticoagulant Profile, Plasma

ALBLD / Bleeding Diathesis Profile, Limited, Plasma

AATHR / Thrombophilia Profile, Plasma and Whole Blood

APROL / Prolonged Clot Time Profile, Plasma

ADIC / Disseminated Intravascular Coagulation/Intravascular Coagulation and Fibrinolysis (DIC/ICF) Profile, Plasma

 

25-37 seconds

The activated partial thromboplastin time (APTT) may be 35% longer in full-term newborns that reach adult reference range by age 3 months and twice the adult upper limit in premature infants reaching adult reference range by age 6 months.

Day(s) Performed

Monday through Friday

Report Available

Same day/1 day

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

85730