Partial Thromboplastin Time (PTT), Activated, Plasma

Test Code

APTTT

Alias/See Also

PTT

CPT Codes
85730

Preferred Specimen

Testing should be performed within 4 hours of
draw.

Draw blood in a light blue-top (sodium citrate) tube. Spin
specimen down, remove plasma, spin plasma again, and place 1 mL
of plasma into plastic vial.

Note: Double-centrifuged specimens are
critical for accurate results as platelet contamination may cause
spurious results.

Transport Temperature

Frozen

Methodology
Viscosity Based Detection

Setup Schedule

Monday through Sunday

Reference Range

22.0-39.0 seconds

Critical values

Greater than normal range on pre-Op patient not receiving
anticoagulant therapy

>120 seconds on patients receiving anticoagulant therapy

Performed By
North Mississippi Medical Center Pathology Department

Performing Laboratory
NMMC Pathology Department

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.