Ace the Clinical II Lab Challenge 2026 – Master Supplies & Procedures Like a Pro!

Refractometers determine how much light bends as it passes through a liquid, giving the refractive index of the sample. In plasma, the refractive index rises with protein and other solutes, so the reading can be calibrated to estimate total protein concentration. This dual capability—measuring refractive index and using that value to infer protein concentration in plasma—is why the statement is correct. Refractometers don’t measure pH or viscosity, which are determined by separate methods.