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HelpTest Code LAB325 Activated Partial Thromboplastin Time (PTT)
Specimen Requirement
1.0 mL Sodium Citrate plasma
- One full blue top tube
Specimen Stability
Whole blood: 4 hours at room temperature
Plasma: 2 weeks at -20° C
Testing Schedule
Daily
Reference Range
26.3 – 34.3 seconds
Testing Department
Hematology/Coagulation
Method
Scattered light clot detection
CPT Code
85730