This type of diagnostic test analyzes a biological specimen, typically urine, for the presence of three specific classes of drugs. A common example includes testing for amphetamines, opiates, and cannabinoids. The result indicates whether these substances, or their metabolites, are present above a predetermined threshold concentration.
It serves as a relatively quick and cost-effective initial method for identifying potential substance abuse. Its importance lies in its utility for pre-employment screening, monitoring compliance with treatment programs, and assisting in legal or forensic investigations. Its widespread adoption stems from the balance it strikes between breadth of coverage and affordability, making it a practical choice in many situations.