Question

What is the ratio of the sampling time to wash time?

(a) 1:2

(b) 3:1

(c) 2:1

(d) 1:3

I had been asked this question during an interview for a job.

My doubt is from Skin Reflectance Oximeters topic in chapter Oximeters of Biomedical Instrumentation

Answer 1

Right choice is (c) 2:1

Easiest explanation: Between each sampling, the crook enters a receptacle of water or other suitable wash fluid, to reduce cross-contamination of one sample with another. The ratio of sampling time to wash time is normally 2:1.