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Partial Thromboplastin Time (PTT), Plasma
Test Code893
CPT Codes
85730
Instructions
Container/Tube: Light blue-top (citrate) tube-Grossly hemolyzed, clotted blood, or an insufficient specimen is not acceptable.
Specimen Volume: Full tube
Collection Instructions: Blood to anticoagulant ratio is critical.
Note: 1. Results may be affected by hematocrit >55%. 2. Tube should remain stoppered. 3. Specimen cannot be drawn from heparinized line.
Transport Temperature
Refrigerate
Specimen Stability
Room temperature: 4 hours
Refrigerated: 4 hours
Refrigerated: 4 hours
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Grossly hemolyzed, clotted blood, a specimen over 4 hours old, or an insufficient specimen is not acceptable.
Methodology
Clot Formation
Setup Schedule
Monday through Sunday
Reference Range
22-33 seconds
Critical values (automatic call-back): >130 seconds if on anticoagulant therapy; >40 seconds if not on anticoagulant therapy
Critical values (automatic call-back): >130 seconds if on anticoagulant therapy; >40 seconds if not on anticoagulant therapy
Clinical Significance
Useful for evaluation of intrinsic coagulation systems: factors II, V, VIII, IX, X, XI, XII, and for monitoring heparin therapy.
Performed By
CoxHealth
