Question

In phasing, if the cholesterol stream arrives at Y time, albumin must arrive at ______

(a) Y + 5 s

(b) Y + 10 s

(c) Y + 15 s

(d) Y + 20 s

This question was posed to me in a job interview.

My question is based upon Skin Reflectance Oximeters topic in portion Oximeters of Biomedical Instrumentation

Answer 1

Right answer is (c) Y + 15 s

Easiest explanation: With 12 tests to be recorded on each sample and a sampling rate of 60 samples per hour, it follows that 5 s are allowed to record each steady state plateau. The reaction streams in the 12 channels and up to four blank channels must, therefore, be phased to arrive at the colorimeter in waves 5 s apart. For example, if the cholesterol stream arrives at X time, calcium must arrive at X + 5 s, total protein at X + 10 s, albumin at X + 15 s, etc.