Since McNemar is preferred test for paired categorical data, I used it and got significant difference in comparison of 45% for all proportions but 45% to 37%. I interpret this as "other tests show significantly lower frequency of renal disorder in same people".

However, when I use chi-squared test I do not get any significant difference when mutually comparing proportions - I interpret this as proportions of patients with other types of disorders do not significantly differ between patients with and without gold-standard renal disorder which is not the same thing. Since chi squared and McNemar do not test the same hypothesis, I am in dilemma whether is it absolutely forbidden to use chi sqared test for paired data? I would like to publish my data and I'm not sure is it appropriate to present chi squared comparisons.

In addition, please suggest how to best compare these diagnostic other tests to golden standard (first approach yielding 45% renal dysfunction), ROC curve analysis?