Reliability of Urinary Excretion Rate Adjustment in Measurements of Hippuric Acid in Urine

Annamaria Nicolli, Federica Chiara, Alberto Gambalunga, Mariella Carrieri, Giovanni Battista Bartolucci and Andrea Trevisan
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Annamaria Nicolli: Department of Cardiologic, Thoracic and Vascular Sciences, University of Padova, I-35128 Padova, Italy
Federica Chiara: Department of Cardiologic, Thoracic and Vascular Sciences, University of Padova, I-35128 Padova, Italy
Alberto Gambalunga: Department of Cardiologic, Thoracic and Vascular Sciences, University of Padova, I-35128 Padova, Italy
Mariella Carrieri: Department of Cardiologic, Thoracic and Vascular Sciences, University of Padova, I-35128 Padova, Italy
Giovanni Battista Bartolucci: Department of Cardiologic, Thoracic and Vascular Sciences, University of Padova, I-35128 Padova, Italy
Andrea Trevisan: Department of Cardiologic, Thoracic and Vascular Sciences, University of Padova, I-35128 Padova, Italy

IJERPH, 2014, vol. 11, issue 7, 1-9

Abstract: The urinary excretion rate is calculated based on short-term, defined time sample collections with a known sample mass, and this measurement can be used to remove the variability in urine concentrations due to urine dilution. Adjustment to the urinary excretion rate of hippuric acid was evaluated in 31 healthy volunteers (14 males and 17 females). Urine was collected as short-term or spot samples and tested for specific gravity, creatinine and hippuric acid. Hippuric acid values were unadjusted or adjusted to measurements of specific gravity, creatinine or urinary excretion rate. Hippuric acid levels were partially independent of urinary volume and urinary flow rate, in contrast to specific gravity and creatinine, which were both highly dependent on the hippuric acid level. Accordingly, hippuric acid was independent on urinary specific gravity and creatinine excretion. Unadjusted and adjusted values for specific gravity or creatinine were generally closely correlated, especially in spot samples. Values adjusted to the urinary excretion rate appeared well correlated to those unadjusted and adjusted to specific gravity or creatinine values. Thus, adjustment of crude hippuric acid values to the urinary excretion rate is a valid procedure but is difficult to apply in the field of occupational medicine and does not improve the information derived from values determined in spot urine samples, either unadjusted or adjusted to specific gravity and creatinine.

Keywords: hippuric acid; specific gravity; creatinine; urinary excretion rate; urinary volume; urinary flow rate (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2014
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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