Measurement of the relative cloudiness of a solution, such as urine, in which the amount of light able to pass through the substance is quantified by using a spectrophotometer.
Measurement of the transmission of light through a suspension, used to determine the presence of protein in urine, spinal fluid, or plasma, and in the quantitative determination of bacteria and antigen-antibody complexes.
A method of quantifying the sediment content present in a liquid.