Question

A serum glucose sample was too high to read, so a 1:5 dilution using saline (dilution A) was made. Dilution A was tested and was again too high to read. A further 1:2 dilution was made using saline (dilution B). To calculate the result, the dilution B value must be multiplied by:

a 5
b 8
c 10
d 20

Answer 1

The dilution B value must be multiplied by 20.

Step-by-step explanation:

To calculate the result, the dilution B value must be multiplied by 20. This is because the dilution B is a 1:2 dilution, meaning that the original concentration is being halved. Since the question asks for the value to be multiplied, we need to find the factor by which the concentration is decreasing, which is 1/2. In this case, 1/2 is equal to 0.5, but it is more commonly expressed as a fraction of 1:2. Therefore, the correct answer is d) 20.