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Laboratory Medicine

Test catalogue

Post-transfusion Purpura (PTP)

Test Name

Post-Transfusion Purpura (PTP)

Pink Tube Red Tube with thin top Specimen Type / Requirements

Container Type = 3 Pink Top and 2 Red Top Tubes

Minimum Venous Volume = 3 x 7 ml EDTA specimen (Pink Top), 2 Red Tops

Tubes must fill to at least ½ or greater of its vacuum capacity

Specimen Handling

Collection Instructions: Collect sample in 3 Pink Top tubes and 2 Red Top tubes. Samples should be well mixed at time of collection. Requisition must have ordering physician, phlebotomist signature, collection date and time. Specimen must be clearly labeled with patient information.

Stability: Stable at room temperature for 2 hrs

Transportation:Send to Transfusion Medicine lab at room temperature as soon as possible. Must be delivered to TM by 12:00pm, Moday - Thursday only.

Sample Rejection Criteria: Grossly hemolytic, icteric or lipemic specimens. Unlabeled and/or mislabeled specimens. Incomplete TM requisitions.

Required Documentation

Ensure both requisitions are completed with ordering physician name and phlebotomist signature, date and time of draw.

Turnaround Time (TAT)

14 Days.

Test Utilization

Reference Value

See Report

Test Code




Testing Location

Referred Out – MB, Canada (ROCBSW39)

Other Information

Last Updated: June 06, 2019