نتایج جستجو برای: urine specimen collection
تعداد نتایج: 307068 فیلتر نتایج به سال:
OBJECTIVE To evaluate the salt intake and urinary Na+/K+ ratio in a randomized sample from an ethnically mixed urban population. METHODS A randomized residential sample of 2,268 individuals aged 25-64 in Vit ria, ES, was selected, of whom 1,663 (73.3%) reported to the hospital for standardized tests. Salt, Na+ and K+ intake was estimated from 12-hour urine excretion (7 p.m. to 7 a.m.) and fro...
Determining calcium bioavailability is important in establishing dietary calcium requirements. In infants and small children, previously conducted mass balance studies have largely been replaced by stable isotope-based studies. The ability to assess calcium absorption using a relatively short 24-hour urine collection without the need for multiple blood samples or fecal collections is a major ad...
BACKGROUND Patients with chronic kidney disease have been reported to have increased concentrations of blood tryptase. Detection of tryptase in the urine of healthy subjects has been reported. OBJECTIVE The objective is to determine whether tryptase is indeed cleared by the kidneys. METHODS Blood and urine collections were performed in healthy and systemic mastocytosis subjects. Total and m...
This study was undertaken to formulate reliable confidence limits for the relationship between nocturnal and 24-hour urine sodium (Na) excretion for use in population compliance studies. Urine excretions were measured in 12 white and 12 black men at three levels of sodium (Na) intake (10, 200, and 400 mEq/day) for 7 days. Nocturnal Na, chloride (Cl), and Cl determined by titrator stick were all...
8-hour urine excretions of 5-hydroxyindoleacetic acid (5-HIAA) were measured in 18 children with coeliac disease before treatment and the results expressed as microgram 5-HIAA/mg creatinine. Similar measurements were made on urine collections from an age-matched control group of 24 children. Significantly higher values of 5-HIAA excretion were found in children with untreated coeliac disease. M...
OBJECTIVE The objective of the study was to determine completeness of 24-hour urine collection in pregnancy. STUDY DESIGN This was a retrospective laboratory/chart review of 24-hour urine collections at British Columbia Women's Hospital. Completeness was assessed by 24-hour urinary creatinine excretion (UcreatV): expected according to maternal weight for single collections and between-measure...
INTRODUCTION It is imperative that laboratories receive uncontaminated urine samples to avoid giving false-positive results and reduce antimicrobial use. AIM The aim of the study was to investigate a novel urine collection device (Peezy) in a renal outpatient clinic to determine whether it reduced contamination of urine samples. METHODS The novel device was used in 420 renal transplant reci...
We developed a convenient animal experimental model to study the effects of passive smoking on urinary mutagenicity. Rats were individually placed into metabolic cages, and were exposed to a side-stream of cigarette smoke under specific conditions. Then 24-hour urine collections were performed. Mutagenicity was investigated by the Ames test using the Salmonella typhimurium strains TA98 and TA10...
BACKGROUND Adolescence is characterized by marked psychosocial, behavioural and biological changes and represents a critical life transition through which adult health and well-being are established. Substantial research confirms the role of psycho-social and environmental influences on this transition, but objective research examining the role of puberty hormones, testosterone in males and oes...
STIFFLER, DANIEL F., AND RONALD H. ALVARADO. Rena/function in response to reduced osmotic load in larval salamanders. Am. J. Physiol. 226(5) : 1243-l 249. 1974.-Renal function was studied in larval Ambystoma gracile and Dicamptodon ensatus exposed to several osmoh&ties. Clearance methods were employed in free-swimming larvae using inulin as a GFR marker. GFR, as calculated from the rate of appe...
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