ADA and meningeal tuberculosis: Based on our clinical experience, if we consider the pre-test probability of 50% for diagnosing TBM with the CSF-ADA test, it will increase the post-test probability up to 89% with positive likelihood ratio (PLR) of 8 (95%: CI 5.7-11.9) and negative likelihood ratio (NLR) of 0.17 (95% CI: 0.12-0.26) and post-test probability of 15% as shown in Fagan plot (Figure 6).