ARUP's Laboratory Test Directory

0030235: Partial Thromboplastin Time

Test Mnemonic: PTT
Methodology: Electromagnetic Mechanical Clot Detection

Performed: Sun-Sat

Reported: 1-2 days

Specimen Required:  
Collect: One 5 mL lt. blue (3.2% sodium citrate).

Transport: 1 mL platelet-poor plasma (lt. blue, 3.2% sodium citrate), frozen. (Min: 0.5 mL) Submit specimen in an ARUP Standard Transport Tube.

Pediatric Collection/Transport: Collect one 1.8 mL lt. blue. Transport 1 mL platelet-poor plasma (lt. blue, sodium citrate), frozen. (Min: 0.5 mL)

Remarks: Separate plasma from cells ASAP and freeze for transport.

Unacceptable Conditions: Serum, clotted or hemolyzed specimens. Specimens ambient or refrigerated greater than four hours.

Stability: Ambient: 4 hours; Refrigerated: 4 hours; Frozen: 1 week

Reference Interval:
24-35 seconds

Note:
Reference interval established using 3.2% sodium citrate.

CPT Code(s):
85730