Power calculation for sensitivity of a diagnostic test

Hi,

I want to test the sensitivity of a rapid test & need to calculate the desired sample size. The sensitivity will be evaluated in a known population of positive individuals.

Could I calculate this using the following:

Code:

power oneprop 0.7 0.8, power(.8) onesided

This would be interpreted as: The study was powered to a sensitivity of 80% assuming a tolerable sensitivity of 70%. A total of 119 samples will be required to provide 80% power and a one-sided significance level of 0.05 to detect the sensitivity.

Thank you,
Megan