Analyte concentrations for calibration samples and for accuracy test samples were selected with the aim to cover physiological and pathological concentrations ranges in urine samples.
But a urine sample from the horse tested positive for a banned substance, and a second urine sample was stolen.
His urine sample was then divided into A and B samples.
The urine sample was found to be free from methyldopa.
After 1 h the urine sample was collected.
The urine samples were randomly selected from the BCPP study and approximate to the population presenting with primary UCB.
From October 2008 through January 2009, a total of 252 routine urine samples were randomly selected from patients of all ages from 3 hospitals and 150 medical practitioners in Viborg County, Denmark (population ≈230,000 persons).
Collection of single urine voids, often referred to as spot urine samples, has been selected as a primary sampling strategy for several practical reasons.
The proportion of heroin-positive urine samples per patient was selected as the efficacy-related end-point because the use of heroin was expected to be more relevant in a cross-over study than an outcome of retention in treatment.
Each urine sample is divided into an A sample and a B sample for testing purposes.
