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. If plasma is to be frozen: 
        a. Immediately transfer the plasma to a stoppered, plastic tube and centrifuge again for 10 minutes. 
        b. Transfer the supernatant plasma into a screw-capped, plastic vial and send frozen at ≤ -20°C, if possible.
3. 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 (regardless of anticoagulant)

Critical values:

> 90

seconds if patient is on a direct thrombin inhibitor (Argatroban, Bivalirudin or Dabigatran)

Lab Personnel

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