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Test Code 2500261 PT/PTT

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

PT 11.8-14.3 seconds

PTT 22.8-34.7seconds

Critical Values

INR >4.0 and >40 seconds

PTT >90 seconds

CPT

PT   - 85610

PTT - 85730

LOINC

34529-8

Methodology

Mechanical Clot Detection