About PLS

In 1965, with three employees and a vision of providing exceptional sevice to the medical community, Dr. Jack T. Peterson opened the doors of Peterson Clinical Laboratory in Manhattan, Kansas.

Today, as Peterson Laboratory Sevices, P.A., that founding philosophy remains. PLS is a full-service cytology and anatomical pathology laboratory with four Board Certified pathologists. We offer you a highly trained and experienced team of technologists, technicians, billing specialists and client service representatives.

We are proud to be locally owned and of the benefits our clients receive as a result. PLS offers you customized services to meet your laboratory needs. We are readily available to personally assist you.


Susan L. Speaks, M.D., PhD

Dr. Speaks is Board Certified in Clinical and Anatomic Pathology. She holds a B.S. (Biology), M.S.(Medical Sciences) and PhD (Molecular Genetics of Cancer ) from the University of Nebraska Medical Center in Omaha, Nebraska. She obtained her Medical Degree, with Distinction, and completed her medical residency there. She holds membership in the American Pathology Foundation, American Society of Clinical Pathologists, College of American Pathologists, United States and Canada Academy of Pathology and the Kansas Medical Society/Kansas Pathology Society. She is licensed to practice in Kansas and five surrounding states.

Dionnee James, MD

Dr. James is a board-certified Anatomical-Clinical Pathologist. She earned her medical degree from St. George's University and completed a residency at Rutger's Health St. Barnabas Medical Center, as well as a fellowship in Surgical Pathology at Washington University in St. Louis. Dr. James enjoys the diversity that general surgical and clinical pathology brings. She is currently licensed to practice in Kansas, Missouri and New Mexico. Her passions outside of medicine include music and hiking.