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HelpTest Code PT Prothrombin Time (PT/INR), Plasma
Methodology
ACL TOP, Coagulometric (Turbidimetric) Clot Detection System
Performing Laboratory
Munson Healthcare Laboratories
Specimen Requirements
Specimen must arrive within 24 hours of draw.
Container/Tube: Light blue-top (sodium citrate) tube
Specimen Volume: 4.5 mL (pediatric: 2.7 mL) of sodium citrate whole blood
Transport Temperature: Ambient only
Collection Instructions: Do not refrigerate. Do not centrifuge.
Note: Medicare frequency limitations exist for this test in addition to diagnosis requirements. Click on link for list of medically necessary diagnoses: http://www.munsonhealthcare.org/medical-necessity. See Advance Beneficiary Notice of Noncoverage (ABN) form in Special Instructions.
Special Instructions
No coagulation testing is to be drawn via central line without a physician’s order. Light blue-top tubes must be full to achieve proper blood/anticoagulant ratio.
Reference Values
Adults: 8.6-12.2 seconds
Newborns: 10-15% higher than adult values, within adult normal ranges by 5-7 days postnatally.
Neonate: 20-25% higher than adult values
Critical value (automatic call-back) for International Normalized Ratio (INR):
Pediatric up to 21 years old: ≥ 2.0 INR
21 years and older: ≥ ≥5.0 INR
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
85610