Plasma that is deficient in any of the factors in the intrinsic pathway will demonstrate a prolonged activated partial thromboplastin time (APTT). This assay is used to identify and monitor the treatment of patients with specific intrinsic factor deficiencies.
Send whole blood sample(s) at room temperature as soon as possible.
If specimens cannot be shipped immediately, centrifuge and separate plasma within 1 hour of collection, send frozen plasma on dry ice
STAT: 24 hours, 7 days/week.
Routine: Samples are aliquotted and frozen. The assay is run in batches.
4 hours
1-2 weeks
Adult: 0.61 - 1.46 U/mL
Full-term Infant at Birth: 0.15 – 0.91 U/mL
Premature Infant of 30 to 36 Weeks gestational age: 0.19 – 0.65 U/mL
In case of discrepancies, always interpret results using reference ranges as stated on laboratory reports and/or electronic patient chart.