4.1
LISA‑TRACKER enzyme‑linked immunosorbent assay (ELISA) kits are manufactured by Theradiag and distributed in the UK by Alpha Laboratories. There are 6 LISA‑TRACKER ELISA kits relevant to this assessment. Two kits measure the levels of free antibodies to tumour necrosis factor (TNF)‑alpha inhibitor, 2 kits measure the levels of free TNF‑alpha inhibitor and 2 kits measure the levels of both free TNF‑alpha inhibitor and antibodies to TNF‑alpha inhibitor.