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Comparison of internal standard-normalized matrix factor (IS-normalized MF) for normalized (urinary creatinine = 0.5 mg/mL) and non-diluted urine (urinary creatinine = 1.3, 2, 2.8 mg/mL). For creatinine 0.5 mg/mL—the scatter of the results is shown, because IS-normalized matrix factor was calculated for six different urine samples. Adjustment to other creatinine levels (1.3, 2, and 2.8 mg/mL) was tested only on one urine sample.
