Children's Mercy Hospitals and Clinics
Name
Prothrombin Time (PT)

Synonyms
PT
Protime

CMH Lab Section
Hematology

Specimen Requirements
2.7 mL in sodium citrate blue top tube

Availability
STAT, Urgent, Routine

Turn Around Time
STAT: 1 hour
Routine: 4 hours

Special Instructions
Testing includes INR value for patients > 90 days age

Processing Instructions
Send specimen to Lab ASAP

Methodology
STAR, mechanical clot detection

Ranges
Age Dependent
0-30 days 10.8-17 sec
31-90 days 10.8-16.2
> 90 days 11.3-15.6
Critical Value = >37.4

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