Overview of Services

The primary service that will be offered is clinical toxicology testing (prescription drugs, illicit substances) in a variety of matrices including blood, urine and oral fluid. In addition, we provide CLIA compliant testing results that can be returned to study participants or their healthcare providers (e.g. Saliva SARS-CoV-2 antibody testing). The testing center was established as part of the HPTN LC Toxicology core to facilitate high-volume qualitative screening of plasma samples for ARV drugs, as well as urine toxicology screening by mass spectometry. This generated interest from other labs both within and outside of Johns Hopkins, and we now receive requests to develop mass spectrometry-based drug screening in a variety of sample matrices and perform testing on a fee-for-service basis.


William Clarke, Ph.D.
Professor, Lab Director

Branch Coleman
Lab Supervisor

Location and hours of operation

Hours       Location

8:30 am - 5:00 pm

     600 N Wolfe Street
     Meyer Building, room B154
     Baltimore, MD 21287

Links and Resources



Name Role Phone Email Location
William Clarke, Ph.D.
Professor, Lab Director
600 N Wolfe Street Meyer Building, room B154 Baltimore, MD 21287

Service list

Search available services:
Name Description Price
Clozapine Inquire
COVID Serology Testing Inquire
COVID Serology with Dilution Series

This this the standard COVID serology testing with additional dilutions to allow for semi-quantitative results when results are above the measurable range

JHU Internal $36.00 each
External - Non-Academic $62.00 each
Everolimus Inquire
HRAM MS Targeted Toxicology Screening Inquire
HRAM MS Untargeted Toxicology Screening Inquire
Hydroxychloroqine Inquire
IDMS for NIST-Traceable Glucose Measurement

This is an LC-MS/MS method for glucose measuremen that is traceable to NIST standard reference materials (SRM).

External - Academic $40.00 each
Method Development Inquire
Mycophenolic Acid Inquire
Qualitative ARV Screening Inquire
Saliva COVID Antibody Testing Inquire
Sirolimus Inquire
Tacrolimus Inquire
Urine Toxicology Screening Inquire
Vancomycin Inquire
Vancomycin, Unbound Inquire