FWIW, nasal potential difference (NPD) is an existing medical test: https://cysticfibrosisnewstoday.com/cystic-fibrosis-diagnosis/nasal-potential-difference/#:

FWIW, nasal potential difference (NPD) is an existing medical test: https://cysticfibrosisnewstoday.com/cystic-fibrosis-diagnosis/nasal-potential-difference/#:~:text=A%20test%20known%20as%20nasal%20potential%20difference%2C%20or,charge%20%E2%80%94%20that%20occurs%20in%20the%20airway%20lining https://cysticfibrosisnewstoday.com/cystic-fibrosis-diagnosi....