At Marshall Toxicology, we believe in providing advanced testing solutions with fast, reliable results. Whether you’re an employer, a provider, a health care facility, a medical researcher or a patient, our experts will work around the clock to get the answers you need exactly when you need them.
With cutting-edge technology and scientific expertise, Marshall Toxicology is the trusted source for your diagnostic testing needs.

Krista L. Denning, MD
Medical Director, Toxicology Services
Professor and Chair, Department of Pathology
+ Full Bio

Kristen Bailey, MS
Managing Toxicologist

Chelsey McPhillen
Toxicology Coordinator

Jamie Bryant
Clinical Lab Assistant

Jennifer Workman
Toxicology Technician


Jomo Ervin
Toxicology Technician


Douglas Smith
Toxicology Technologist

Laura Pike
Specimen Collection
Coordinator

Melissa Adkins
Specimen Collector


Jordan Bias
Specimen Collector

Melissa Conley
Specimen Collector

Jessica Preston
Specimen Collector

William Preston
Specimen Collector

Jamie Reed
Specimen Collector

Janna Riggins
Specimen Collector

Zachary Williams
Specimen Collector
For more information or to schedule a consult, please contact Marshall Toxicology at 304-781-4445.