MIXING STUDY PTT

Mnemonic

PTTMIX

Synonym

50:50 Mixing Studies; Mixing Study: Activated Partial Thromboplastin Time [APTT] Mixing Study - Partial Thromboplastin Time [PTT] Mixing Study

Specimen Collection Requirements

Collect

Whole BLood or Plasma, four light blue (3.2% Buffered Sodium Citrate) top tubes

Preferred Volume

Two 4.0 mL aliquots

Minimum Volume

One 4.0 mL aliquot

Transport

Ambient (20-28°C)

Rejection Criteria

Clotted samples, samples collected in containers other than 3.2% buffered sodium citrate, tubes filled less than 90%, samples from patients with a Hematocrit greater than 55%, hemolyzed samples due to ex-vivo causes (i.e., difficult draw, poor sample draw), whole blood samples that were frozen before processing

Stability

WHOLE BLOOD Ambient: 4 hours PLASMA Ambient: 4 hours; Frozen: -20°C 2 weeks, -70°C 6 months

Testing Information

Performed

7 days/week

Method

Clotting

Referral Lab

Samaritan Health Services Laboratories

Reference Values

Reference Values

See report.

CPT Codes

85730

Last Updated: Thursday, January 5, 2017 03:42:23 AM