Sign in →

Test Code LAB5157 Activated Partial Thromboplastin (APTT), Plasma

Performing Laboratory

Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center / Asante Ashland Community Hospital

Specimen Minimum Volume

1 properly filled 2 mL Blue top tube

Billing Code

3000612

Methodology

Turbidimetric clot detection by measuring change in optical density

Specimen Requirements

Blue top tube - Refer to ORDER OF DRAW      Order of Draw

 

Note:  The ratio of blood to anticoagulant is critical.

Vacutainers must draw their full volume.

Syringe Draw:     

2.7 mL blood in 3 mL Blue top tube

1.8 mL blood in 2 mL Blue top tube

 

Specimens will not be accepted if tubes are not filled to their correct volume.

If multiple tests are drawn, draw coagulation studies first or second

Performing Department

Hematology

Day(s) Test Set Up

Monday through Sunday

Routine - same day

ASAP - 2 hours after receipt of specimen in lab

STAT - 1 hour after receipt of specimen in lab

Test Classification and CPT Coding

85730 Thromboplastin time, partial (PTT); plasma or whole blood

Additional Information

Evaluation of intrinsic coagulation system, useful in monitoring heparin therapy. 

Aids in screening for presence of classical hemophilia A and B; Christmas disease; congenital deficiencies of Factors II, VI, VIII, IX, X, XI and XII; dysfibrinogenemia; vitamin K deficiency; congenital deficiency of Fitzgerald factor; congenital deficiency of prekallikrein (Fletcher factor).

 

Not recommended for danaparoid, low molecular weight heparin monitoring.

(use Factor Xa inhibition if needed)

Specimen Transport Temperature and Stability

Specimen stable 4 hours unopened or opened, room temperature or refrigerated

 

AACH: Test within 4 hours or aliquot plasma and freeze

Reasons for Rejection

Quantity not sufficient (QNS)

Specimens not filled to correct volume

Lacking Two Patient Identifiers:

         1-Patient's First & Last name 

         2-Patient's Date of Birth

Hemolysis

Clotted specimen