Urinary creatinine is used as an adjustment factor of the concentration of metabolites excreted in urinary random samples. The usefulness of this practice is longtime disputed. The aim of this study, made in 94 workers, is to estimate if the creatinine-adjustment of V and Ni urinary concentrations brings a true advantage in his capacity to predict the amount of metal excreted in 24 hours. The results shown this practice is pointless and that also in case of urinary samples at anomalous dilution. A greater accuracy in expression of analytical results of V and Ni excretion may be obtained collecting the urinary samples with a known amount, that is to say more representative of the daily diuresis.

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