Activated Partial Thromboplastin Time

CERNER / EPIC MNEMONIC: APTT
POE DESCRIPTION: ACTIVATED PTT; PTT
CPT CODE: 85730
DAYS PERFORMED: Daily, 24 hours
TURNAROUND TIME: Routine: 4 hours. Stat: 1 hour
SPECIAL INSTRUCTIONS: Transport the specimen to Specimen Receiving as soon as possible. Blood should arrive in the Coagulation Laboratory within 4 hours of drawing. This test cannot be added onto an existing sample more than 4 hours old.
CONTAINER TYPE:

Blue citrate tube

COLLECTION:

See Section - Specimen Collection Guidelines - Coagulation Specimens

SPECIMEN REQUIREMENTS:

Blood; 4.5 mL tube or pediatric 1.8 mL or 2.7 mL tube

REJECTION CRITERIA: Specimen hemolyzed; Hct >55%; underfilled tube (QNS)
MINIMUM VOLUME: 3.5 mL blood (1.0 mL plasma); pediatric tubes must be fully drawn.
HANDLING INSTRUCTIONS: Transport the specimen to the laboratory as soon as possible. Specimen MUST be received within 4 hours after collection.
REFERENCE RANGE: 23-33 seconds
CRITICAL VALUES: >100 sec
TEST SYNONYM(S):APTT; Partial Thromboplastin Time; PTT