Submit a set of 3 specialized QFT heparin tubes provided by the lab: one Gray top - Nil tube, one Red top – TB antigen tube, and one Purple top – Mitogen control tube. Collection procedure is very specific and detailed. Refer to the QFT Collection Protocol in the section “Microbiology Collection and Submission Protocols” on this web site.
Specimens must be incubated at 37° within 16 hours of the draw for 16-24 hours. If incubation was performed at the site, specimens must be received at WPHL within 3 days of incubation. The specimen must be received by Friday of that week.
Specimens may be incubated at WPHL instead of on site, if delivered to the lab within 16 hours of the draw on Monday through Thursday. Contact the WPHL for further instructions.