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Prothrombin Time

Centralized Core Laboratory : Hematology

Test ID/Workstation :
Specimen Type:
Tube Type:
Blue top (sodium citrate) tube
Collection Volume:
2.7 mL (minimum 1.8 mL) Must use appropriate sodium citrate tube based on volume of blood drawn (1.8 mL or 2.7 mL tube)
Cause for Rejection:
Sample hemolyzed, clotted, diluted with IV fluid; contaminated with heparin; improperly filled; received >4 hours after drawn
Daily, 24 hours; STAT
Special Instructions:
Indicate clearly if a specimen has been drawn from an arterial line or from a line that has been rinsed with heparin. This information is absolutely essential to the CCL personnel for the proper handling of the specimen and the reporting of results. Please indicate if the patient is currently receiving anticoagulant therapy. If collected at an offsite location, send by a STAT Courier to Akron Children's Hospital lab.
4 hours
Additional Info:
Reference range: 8.5-14.0 secs; INR: 0.7-1.3
  • Recommended Therapeutic Range for Oral Anticoagulant Therapy: Prophylaxis of venous thrombosis, Treatment of venous thrombosis, Treatment of pulmonary embolism, Prevention of systemic embolism, and Tissue heart valves - INR 2.0-3.0, Myocardial infarction (to prevent systemic embolism), Valvular heart disease, Atrial fibrillation, Mechanical prosthetic valves - INR 2.0-3.0
  • CPT Code:
    PROTIME; PT; Protime with INR, PT/INR
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