T-Detect test in Thailand?

A test named T-Detect or perhaps T-Spot (no response from that Oxford Biomedical Website so far) should clear your T-cell status and if you ever have been in contact with SARS-COV 2. It goes further back into the past as PCR testing and is preciser.

Has anyone found a way to get it done here? I phoned Bangkok Hospital, Bumrungrad, Chulalungkorn and Mahidol, all denied providing such a test.