A replaceable cuvette assembly capable of installation in an optical absorbance measurement system for measuring whole-blood hemoglobin parameters or whole-blood bilirubin parameters, the cuvette assembly comprising: a cuvette substrate; and a cuvette module replaceably connected to the cuvette substrate, wherein the cuvette substrate is a support configured to secure the cuvette assembly within the optical absorbance measurement system, the cuvette module comprising: a sample inlet port; a sample outlet port; a sample receiving chamber that fluidly communicates with the sample inlet port and the sample outlet port; an electronic chip assembly comprising a chip circuit board and an electronic chip with a cuvette optical path length value of the sample receiving chamber programmed into the electronic chip; a first cuvette window; and a second cuvette window forming a portion of the sample receiving chamber, wherein the first cuvette window and the second cuvette window are aligned with each other, thereby defining a cuvette optical path length having the cuvette optical path length value between the first cuvette window and the second cuvette window, wherein the cuvette module includes a cuvette first portion and a cuvette second portion bonded to each other and thereby forming the sample receiving chamber, the cuvette first portion having an electronic chip recess, the electronic chip assembly being disposed within the electronic chip recess, and wherein the first cuvette window and the second cuvette window are disposed within an optical path of the optical absorbance measurement system. a cuvette substrate; and a cuvette module replaceably connected to the cuvette substrate, wherein the cuvette substrate is a support configured to secure the cuvette assembly within the optical absorbance measurement system, the cuvette module comprising: a sample inlet port; a sample outlet port; a sample receiving chamber that fluidly communicates with the sample inlet port and the sample outlet port; an electronic chip assembly comprising a chip circuit board and an electronic chip with a cuvette optical path length value of the sample receiving chamber programmed into the electronic chip; a first cuvette window; and a second cuvette window forming a portion of the sample receiving chamber, wherein the first cuvette window and the second cuvette window are aligned with each other, thereby defining a cuvette optical path length having the cuvette optical path length value between the first cuvette window and the second cuvette window, wherein the cuvette module includes a cuvette first portion and a cuvette second portion bonded to each other and thereby forming the sample receiving chamber, the cuvette first portion having an electronic chip recess, the electronic chip assembly being disposed within the electronic chip recess, and wherein the first cuvette window and the second cuvette window are disposed within an optical path of the optical absorbance measurement system. a sample inlet port; a sample outlet port; a sample receiving chamber that fluidly communicates with the sample inlet port and the sample outlet port; an electronic chip assembly comprising a chip circuit board and an electronic chip with a cuvette optical path length value of the sample receiving chamber programmed into the electronic chip; a first cuvette window; and a second cuvette window forming a portion of the sample receiving chamber, wherein the first cuvette window and the second cuvette window are aligned with each other, thereby defining a cuvette optical path length having the cuvette optical path length value between the first cuvette window and the second cuvette window, wherein the cuvette module includes a cuvette first portion and a cuvette second portion bonded to each other and thereby forming the sample receiving chamber, the cuvette first portion having an electronic chip recess, the electronic chip assembly being disposed within the electronic chip recess, and wherein the first cuvette window and the second cuvette window are disposed within an optical path of the optical absorbance measurement system.