PTT (PTT)

Test Code

LAB325

Alias/See Also

PTT

CPT Codes
85730

Preferred Specimen

5 mL whole blood in blue top tube

Instructions

Blue-top tubes (3.2% Sodium Citrate) must be completely filled (to the 'fill-line'). If a Blue-top tube is the only tube being collected, it is recommended that you draw and DISCARD a minimum of 5 mL prior to collecting. If a specimen must be collected through an indwelling catheter, IV, or arterial line, flush with 5 mL of saline and discard the first 5 mL of blood (or six dead space volumes of the catheter) prior to drawing the testing specimen. Flushing with heparin should be avoided.

Transport Container

Blue top tube

Transport Temperature

Frozen

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Clotted or grossly lipemic specimen; tube incompletely filled

Reference Range

25-38 seconds

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.