Temporal variability of urinary cadmium in spot urine samples and first morning voids
نویسندگان
چکیده
منابع مشابه
Variability of Urinary Concentrations of Bisphenol A in Spot Samples, First Morning Voids, and 24-Hour Collections
BACKGROUND Human exposure to bisphenol A (BPA) is widespread. After exposure, BPA is rapidly metabolized and eliminated in urine. Therefore, there is considerable within-person and between-person variability of BPA concentrations in spot urine samples. However, no information exists on the within-day variability of urinary BPA concentrations. OBJECTIVES We examined the between-person and with...
متن کاملFirst morning voids are more reliable than spot urine samples to assess microalbuminuria.
Measurement of urinary albumin excretion (UAE) in a 24-h collection is the gold standard method to determine the presence of microalbuminuria. We sought to compare more practical alternatives--measurement of urinary albumin concentration (UAC) or albumin:creatinine ratio (ACR)--in a first morning void or in a spot urine sample with this gold standard. We asked 241 participants of a prospective ...
متن کاملTemporal variability in urinary excretion of bisphenol A and seven other phenols in spot, morning, and 24-h urine samples.
Human exposure to modern non-persistent chemicals is difficult to ascertain in epidemiological studies as exposure patterns and excretion rates may show temporal and diurnal variations. The aim of this study was to assess the temporal variability in repeated measurements of urinary excretion of bisphenol A (BPA) and seven other phenols. All analytes were determined using TurboFlow-LC-MS/MS. Two...
متن کاملReproducibility of urinary phthalate metabolites in first morning urine samples.
Phthalates are ubiquitous in our modern environment because of their use in plastics and cosmetic products. Phthalate monoesters--primarily monoethylhexyl phthalate and monobutyl phthalate--are reproductive and developmental toxicants in animals. Accurate measures of phthalate exposure are needed to assess their human health effects. Phthalate monoesters have a biologic half-life of approximate...
متن کاملVariability of Metal Levels in Spot, First Morning, and 24-Hour Urine Samples over a 3-Month Period in Healthy Adult Chinese Men
BACKGROUND Metals in single spot urine samples are often used to estimate individual exposure in human studies. However, measurements in urine could vary greatly over time due to variable exposure, potentially leading to exposure misclassification. OBJECTIVE We examined the variability of metal levels in the urine of 11 men who provided 529 samples on 8 days during a 3-month period, which cor...
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ژورنال
عنوان ژورنال: Journal of Exposure Science & Environmental Epidemiology
سال: 2016
ISSN: 1559-0631,1559-064X
DOI: 10.1038/jes.2016.28