Question

The instrument of an optical method of counting cells, that require about _____ of blood sample.

(a) 100 ml

(b) 1 liter

(c) 1 ml

(d) 10 ml

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

Enquiry is from Intravascular Oximeters topic in division Oximeters of Biomedical Instrumentation

Answer 1

Correct answer is (c) 1 ml

The explanation: Instruments based on optical technique take about 30 s for completing the count. An accuracy of 2% is attainable. The instruments require about 1 ml of the blood sample.