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h i g h l i g h t s g r a p h i c a l a b s t r a c tDescription of two homemade platforms for the cheap quantification of creatinine level in urine. Image processing to extract absorption spectra and spectral fingerprints. PLS regression for creatinine evaluation in urine from digital camera images.Validation of results with capillary electrophoresis reference data.a r t i c l e i n f o . Good repeatability was observed for intra-day (1.7e2.9%) and inter-day (3.6e6.5%) measurements evaluated on three consecutive days. The performance of CDS and CSPT was also validated in real human urine samples (n ¼ 26) using capillary electrophoresis data as reference. Corresponding Partial Least-Squares (PLS) regression models provided for mean relative errors below 10% in creatinine quantification.

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