Sign in →

Test Code PTT Aptt

Specimen Type

Blood.

Preferred Collection Container

BLUE

Collection Volume

2.7 mL in 2.7 mL tube

Minimum Collection Volume

1.8 mL in 1.8 mL tube

Collection Instructions

Routine venipuncture. If multiple tests are being drawn, the recommended order of draw is as follows: blood cultures, sodium citrate tubes, gel separator/plain serum plastic tubes, heparin tubes, EDTA tubes. A special tube should be obtained from the laboratory for hematocrits over 55%. Specimens should be transported as soon as possible to the Clinical Laboratory.

Rejection Criteria

Specimens that are clotted, hemolyzed, diluted with IV fluid, insufficient volume, improperly labelled. If the patient is on heparin, a specimen more than 4 hours old will be rejected. If the patient is not on heparin, a specimen more than 6 hours old will be rejected.

Specimen Storage and Stability

For testing delayed longer than 6 hours- centrifuge sample for 15 mins at 1500g and separate plasma. Transfer once-centrifuged, citrate plasma into a plastic tube. Sample should be frozen in a frost-free -20 C freezer. Sample must remain frozen until testing is performed.

Turn Around Time

4 hours.

Lab Department

Hematology

Alias

Activated Partial Thromboplastin Time; Partial Thromboplastin Time, Activated PTT; PTT; APTT;

Ordering Info

NOTE: Collection of blood for coagulation testing through indwelling catheters that have been flushed with heparin should be avoided, if possible. If specimen is drawn through an indwelling catheter, the line should be flushed with 5 ml saline and the first 5 ml of blood or six times the deadspace volume of the catheter being used should be discarded. Proper collection and handling of specimens is critical.

EPIC Code

LAB325

Pediatric Collection Container

BLUE

Acceptable Collection Container

BLUE (3.2% buffered sodium citrate)

Day(s) and Time(s) Performed

Monday through Sunday, 24 hours