https://www.stethcare.in/?faq=what-kind-of-specimen-is-collected-for-a-drug-toxicology-test
Q: What kind of specimen is collected for a drug (toxicology) test? - StethCare
Apr 1, 2023 - A: Urine is the most common specimen type because drugs are cleared out of the bloodstream primarily by the liver and kidneys and eliminated through urine
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