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Test Code LAB4084 PARTIAL THROMBOPLASTIN MIX

Important Note

Sodium Citrate Blue top tube must be filled completely to give the correct anticoagulant / blood ratio. Test or freeze platelet poor plasma within 4 hours of draw.

Specimen Type

3mL Blue top (3.2% Sodium Citrate), or
5mL Blue top (3.2% Sodium Citrate)

Collection Instructions

Blue top Sodium Citrate tube filled to capacity. Must be performed within 4 hours of specimen collection or made into platelet poor plasma and frozen.

Specimen Volume

2 mL

Minimum Volume

1 mL citrated plasma

Turnaround Time

STAT: 1 hour
Routine: 4 hours

Test Schedule

Daily

Specimen Processing

Assays on nonheparinized patients must be performed within 4 hours of collection. Assays on specimens suspected to contain unfractionated heparin therapy should be centrifuged and the plasma removed from the cells within 1 hour of collection and tested within 4 hours of collection. If time interval between drawing and testing exceeds 4 hours, centrifuge specimen, separate plasma, recentrifuge, separate into plastic tube, and freeze at -20C or less.

Method

Electromechanical

Reference Ranges

APTT 1:2 - 0 MIN = 23.5 - 34.6 seconds

APTT 1:2 - 60 MIN = 23.5 - 34.6 seconds

 

Synonyms

Partial Thromboplastin Time Mixing Study

CPT Codes

85730

Rejection Criteria

Severely hemolyzed, clotted samples or inappropriately filled liquid blue top tubes, specimens more than 4 hours old that have not been separated and frozen at -20C or less.