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Colorimetric Assay Lab Report

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Creatinine is a waste product filtered by the kidneys into the blood (serum) and urine. High serum, and/or urine creatinine levels are indicative of kidney dysfunction. A colorimetric assay can be used to determine the creatinine concentration in the urine and serum samples from patients who are suspected to have kidney dysfunction.

In the creatinine colorimetric assay the absorbance of the yellow creatinine-picric complex, which is formed from the reaction between creatinine and picric acid, is read spectrophotometrically. Using spectrophotometric data one can determine the relationship between creatinine concentration and absorbance by fitting an equation to the creatinine and absorbance data. The equation sets a standard which can be used to determine the concentration of creatinine in solutions, such as blood and urine, which contain creatinine.

The colorimetric assay is useful in so far as finding the concentration of creatinine. However, a diagnosis of kidney dysfunction requires the creatinine concentration in both serum and urine to be analysed. This is because serum and urine creatinine concentration can vary as function of the patient's gender, age, size (i.e., body obesity, muscle mass, or malnutrition). This can lead to creatinine concentration appearing normal when there is an underlying kidney dysfunction, or …show more content…

Patients: N1 (female, age: 24, weight: 58kg); N2 (female, age: 26, weight: 65kg), N3 (female, age: 23, weight: 59kg), A3 (male, age: 29, weight: 99kg), C3 (male, age: 30, weight: 75kg), and A3 (female, age: 23, weight: 58kg). A colorimetric assay was employed to measure the levels of creatinine in serum and urine samples The measured creatinine concentration was anaylsed holistically by adjusting creatinine concentration by age, weight and gender, and hydration. Patient kidney function was measured by the glomerular filtration rate

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