Sign in →

Test Code 2500108 PTT (PARTIAL THROMBOPLASTIN TIME)

Specimen Requirements

1. Draw blood in blue-top (citrate) tube. Spin down, remove plasma, spin plasma again, and place 1 ml of citrate platelet-poor plasma in plastic vial.

2. Freeze specimen immediately at <40 C, if possible.

3. Send specimen frozen.

Specimen Stability Information

Platelet poor plasma (citrated)/RT, spun/ 4 hours

Reject Due To

Hemolysis, Lipemia, Icterus Mild Ok. Gross:Reject

Reference Values

22.8-34.7 seconds

Critical Values

>90 seconds

CPT

85730

LOINC

50197-3

Methodology

Mechanical Clot Detection