# Finding True Positive and True Negative values from sensitivity

I have the sensitivity value known as, 91%. Can we derive the True Positive (TP) and True Negative (TN) values from that. Is that possible at all?

Thanks.

• No. All you know is that $\dfrac{TP}{TP+FN}=0.91$ so one equation and two unknowns. Perhaps you also know $TP+TN +FP+FN=1$ so two equations and four unknowns – Henry Jul 12 '17 at 23:41