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Drugs are chemical substances that can change how your body and mind work. A drug test looks for signs of illegal drugs or certain prescription and/or over-the-counter (OTC) medicines that can be misused. The test is usually done with a sample of your urine (pee). Less commonly, drug testing uses a sample of your blood, saliva (spit), hair, sweat, fingernails, or breath. The purpose of a drug test is to look for drug use and misuse, which includes:

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Early Use of Molecular Diagnostics in the Emergency Department Reduces All-Cause Mortality in Patients with Pneumonia at Risk of Multidrug-Resistant Pathogens.

Research record from Diagnostics (Basel), 2026-10-08. PMID 42882398.

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Diagnostic Yield and Incremental Value of 16S rRNA Gene PCR and Sequencing on Excised Heart-Valve Tissue in Infective Endocarditis: A Systematic Review and Meta-Analysis.

Diagnostic yield and pathogen spectrum in pediatric gastroenteritis: A syndromic approach using multiplex PCR in South India.

Diagnostic yield of reflex multiplex PCR after a negative rapid antigen test in children hospitalized with presumed viral acute respiratory tract infection: a prospective cohort study.

Diagnostica Longwood

Diakon

Dicipa

Disseminated Strongyloides stercoralis infection diagnosed by metagenomic next-generation sequencing of a cell-free DNA blood sample in a patient with hematologic malignancy in Germany: A case report.

Drug Testing

Dutec Diagnostics

DYN Diagnostics Ltd.

Early diagnosis pathway for laboratory testing in the context of pertussis resurgence.

Early Use of Molecular Diagnostics in the Emergency Department Reduces All-Cause Mortality in Patients with Pneumonia at Risk of Multidrug-Resistant Pathogens.