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Drug Testing, General Toxicology (Blood, Urine, or Serum)

Test code(s) 91358, 91359, 91360

The current list of drugs and/or metabolites analyzed and their corresponding limits of detection can be accessed here.

If a compound of interest is not listed, please contact your local Quest Diagnostics laboratory as new compounds will be added continually based upon clinical need and availability of drug standards.

This FAQ is provided for informational purposes only and is not intended as medical advice. A clinician’s test selection and interpretation, diagnosis, and patient management decisions should be based on his/her education, clinical expertise, and assessment of the patient.


Document FAQS.101 Version: 1
Version 1 effective 02/11/2020 to present
Version 0 effective 07/17/2013 to 02/11/2020