PTT
Activated Partial Thromboplastin Time (APTT)
EPIC Test Procedure Code: LAB2885
Synonyms:
APTT
Performing Lab:
Saint Luke's Regional Laboratories
Container Type:
Light blue top (sodium citrate) tube
Specimen Type:
Platelet Poor Plasma
Preferred Volume:
2 mL
Minimum Volume:
1 mL
Collection Procedure:
Specimen Processing:
1. Centrifuge specimen in a centrifuge that has been validated to ensure platelet poor plasma.
2. Immediately transfer the plasma to a stoppered, plastic tube and centrifuge again for 10 minutes.
3. Transfer the supernatant plasma into a screw-capped, plastic vial and send frozen at ≤ -20°C, if possible.
4. If unable to centrifuge, forward unprocessed sodium citrate whole blood (minimum volume: 2 mL) to the laboratory promptly at room temperature only.
Store and Transport:
Plasma - frozen (unless performed at your facility)
Stability:
Uncentrifuged specimens must be analyzed within 2 hours if the patient is on heparin; within 4 hours if the patient is not on heparin.
CPT Codes:
85730 - PTT (EAP 30020288)
Test Schedule:
Monday through Sunday
Reference Ranges:
22 - 34
seconds
Critical values:
> 130
seconds