Because of its rapid turnaround time,the laboratory method of choice used to screen urine samples for their opiate content is:

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Immunoassay is the method of choice for screening urine samples for their opiate content due to its rapid turnaround time. This method is based on the use of antibodies that specifically bind to opiates in the sample, resulting in a color change or other detectable signal that can be easily measured. Gas chromatography and liquid chromatography are more sensitive and specific methods that may be used to confirm the presence of opiates in urine samples, but are typically too slow and expensive to be used for routine screening. The ferric chloride test is an outdated method that is not commonly used for opiate screening.

Because of Its Rapid Turnaround Time,the Laboratory Method of Choice