Children's Mercy Hospitals and Clinics
Name
Partial Thromboplastin Time (PTT)

Synonyms
Activated Partial Thromboplastin Time
PTT
APTT

CMH Lab Section
Hematology

Specimen Requirements
2.7 ml in a Sodium Citrate blue top tube

Availability
Stat, Urgent, Routine

Turn Around Time
Stat: 1 hr Routine: 4 hrs

Processing Instructions
Send Specimen to Hematology ASAP

Methodology
STAR Mechanical Clot Detection

Ranges
Age Dependent:
0-5 days 31.1 - 48.1 sec
6-30 days 29.4 - 45.7
31-180 days 26.8 - 41.5
> 180 days 24.5 - 37.5

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