PTT Mixing Study

SIM

21130 

CPT

85732 

Synonyms

Specimen Type

Sodium Citrate Plasma 

Container

Two tubes – 4.5 ml Sodium Citrate 3.2% Blue stopper tube

Collection Instructions

None

Volume

4 ml plasma 
Min: 2.0 ml 

Additional Information

•  If Plasma is removed, must be stored in Plastic tubes. 
•  Will only be performed if PTT is abnormal.

Patient Preparation

none

Specimen Processing Instructions

For Frozen samples, Platelet Poor Plasma is required: Centrifuge at 3380 rpm’s (±100) for 5 minutes. Remove the plasma without disturbing the cellular layer. Centrifuge again at 3380 rpm's (±100) for 5 minutes. Remove the platelet poor plasma to a transfer tube. 

Whole Blood: send the original collection tube

Transport Requirements

Room Temp or Frozen

Specimen Stability

Room Temperature Whole blood or Plasma: 4 hours 

Frozen Plasma (PPP) : 14 days (-20 degrees) 

Rejection Criteria

•  Clotted Sample 
•  Insufficient volume

Reference Range

Interpretation = Normal

Critical Value

None 

Test Includes

PTT Mixing study and are reviewed by the Pathologist before reporting. 

Methodology

Electromagnetic mechanical clot detection system 

Testing Frequency

First and Second shift only, Daily, Monday - Sunday 

Reviewed By

Summer Brochu

Reviewed Date

08/04/2021

Supplemental