PARTIAL THROMBOPLASTIN TIME

Code
200.0500
Name
PARTIAL THROMBOPLASTIN TIME
Category
None
Department
Coagulation
Start Date
Expiration Date
Synonyms
PTT, APTT, Activated Partial Thromboplastin Time
CPT Codes
85730
Site
Main Lab
Reference Test
ATLAS Test Code

Specimen Information

Type

Blue, Citrate

Volume

Fill tube to top of label

Transport Info

Refrigerated
4 hour stability
If transport delayed, centrifuge blue top tube, transfer plasma to a separate plastic tube and Freeze.

Fasting Required?
False
Patient Instructions

Reference Range

22.6-35.3 seconds
Therapeutic range: 58-88 seconds

Methodology

Clot Detection

Clinical Significance

Used as a coagulation screening test for plasma-clotting factors, excluding factors VII and XIII, and is also used to determine the relative heparin level in heparinized patients.
The activated partial thromboplastin time test is a coagulation screening test for plasma-clotting factors, excluding factors VII and XIII, and is also used to determine the relative heparin level in heparinized patients. Heparin is an antithrombin agent. In the case of high dosage of heparin or continuing IV heparin drip, the aPTT will be prolonged and variable due to the antithrombic characteristic of the heparin present.

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