CD4 and tuberculosis: On univariate regression analysis of indeterminate T-SPOT.TB results, there was no statistically significant association with CD4+ T-cell count (OR 1.04, p = 0.15); however, if those with insufficient cells to carry out the T-SPOT.TB were pooled with indeterminate results, there was a statistically significant association between CD4+ T-cell count and indeterminate results (OR 1.079, p = 0.02).