نتایج جستجو برای: specimen collection
تعداد نتایج: 245757 فیلتر نتایج به سال:
BACKGROUND Stool specimen collection is challenging and informal feedback has indicated that participants find the process difficult. Increasing stool specimen returns would improve the investigation of outbreaks of diarrhoeal and food-borne disease. AIM To explore the barriers to stool sample collection and specimen return to ascertain which factors may help to improve the process. DESIGN ...
Several different methods are available for measuring blood glucose in the clinical laboratory on physician’s office. As a result, confusion often arises in the clinical interpretation of glucose values that have been derived by different methocis. There are, of course, many variables to be considered when comparing methods, but the end result is that each method for glucose in whole blood or s...
The fluorometric procedure of determining coproporphyrin has been adapted to determine coproporphyrin on random urine specimens. This adaptation depends on determining both coproporphyrin and creatinine. A mathematical relationship is established for the amount of coproporphyrin excreted when 1200 mg. of creatinine is excreted. An important advantage of the random procedure is the elimination o...
Long turnaround times (TAT) for the processing and posting of results of infant HIV DNA PCR samples can hinder the success of early infant diagnosis (EID) programs. The HITSystem is an eHealth intervention that alerts staff when services are overdue or results are delayed. We conducted a retrospective analysis of 3669 HIV-exposed infants enrolled in 15 Kenya hospital EID programs and three labo...
Two nomograms are given for use in calculating standard, C3, or maximum, Cm, urea clearance. The first nomogram calculates the urine flow rate, f, from the urine collection time and volume data. With the second nomogram, values of f and urea nitrogen concentrations in blood serum (or plasma) and urine are used to calculate either C3 or Cm, according to the value of f. There is no intermediate c...
Blood specimens collected for culture by using the high-volume resin-based BACTEC system over an 18-month period at the Seattle Veterans Administration Center were examined in this study. Of 7,783 cultures obtained, 624 were classified as true positives. Patients in this group had between 20 and 60 ml of blood drawn per culture and separated into 10-ml aliquots for incubation. Analysis of the r...
Although traditional case-control studies may be subject to bias caused by population stratification, alternative methods that are robust to population stratification such as family-based association designs may be less powerful due to overmatching between cases and controls. Furthermore, case-control studies have the advantages of easy sample collection. Recently, several statistical methods h...
BACKGROUND In drug-resistant TB settings, specimen collection is critical for drug-susceptibility testing (DST). This observational study included multiple specimen types collected from pediatric TB suspects with the aim to determine diagnostic yield and inform clinical practice in children with drug-resistant and drug-susceptible TB. METHODS From 03/2009-07/2010, TB suspects aged ≥6 months a...
Salivary steroid hormone analysis: why the way of sample collection and the analytical method matter
Salivary steroid hormone analysis: why the way of sample collection and the analytical method matter
Differences in DNA collection protocols may be a potential confounder in epigenome-wide association studies (EWAS) using a large number of blood specimens from multiple biobanks and/or cohorts. Here we show that pre-analytical procedures involved in DNA collection can induce systematic bias in the DNA methylation profiles of blood cells that can be adjusted by cell-type composition variables. I...
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