PARTIAL THROMBOPLASTIN TIME, MIXING STUDY
| Synonyms: | PTT Mixing Study |
| Computer Code: | MPTT |
| Specimen Collection: | Three 2.7 mL (blue top tubes) 90% full. Transport to lab within 3 hours. |
| Minimum Volume: | two 2.7 mL (blue top tubes) 90% full. Transport to lab within 3 hours. |
| Handling Instructions for Offsite Areas: | Maintain at room temperature. If specimen cannot be transported within 2 hours, centrifuge at 3,000 rpm for 20 minutes. Using a plastic pipette, transfer plasma to plastic tube and freeze plasma. |
| Reference Values: | Test to differentiate whether an abnormal PTT is due to a factor deficiency or an inhibitor. |
| Lab Code: | Hematology |
| Requisition: | C/H |
| Test Frequency: | Daily |
| Routine TAT: | 4 hrs |
| Stat TAT: | contact lab |
| CPT Code(s): | 856730x2, 85732 |
| LCD or NCD: | |
| Methodology Used: |
See Addendum XVII |