A quick sniff around the 'net only found:
http://www.vetbta.com/

Jonathan Kay
 

"tox.rbh" wrote:

I recently had an enquiry from a GP about measuring BTA in urine, the patient had Ca bladder and apparently should be monitored using this test. I can only think it is Bladder Tumour Antigen, but it is not in assay finder. Does anyone know about this?  Paul RobinsonRoyal Berkshire Hospital