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| Title | PTT (aPTT, ACTIVATED PARTIAL THROMBOPLASTIN TIME) |
| Specimen Requirement | 1 blue top/5.0 mL, 3.2% Sodium Citrate tube |
| Methodology | Nephelometry |
| Stability | Refrigerated: 2 days; Frozen: 2 weeks |
| Reference Range | See Report |
| Turnaround | 1 day |
| Clinical Use | PTT is a screening test for the intrinsic coagulation system and as a monitor for the effectiveness of heparin therapy. |
| Test Code | 1919 |
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