New Bolton Center Kennett Square, PA
Emergencies & Appointments:
Ryan Hospital Philadelphia, PA

Penn Vet Diagnostic Laboratories

Penn Vet offers laboratory services to referring veterinarians for their patients. Our sections encompass anatomic pathology, clinical pathology and cytology, microbiology, and parasitology. 

Laboratory Sections

Penn Vet offers a number of laboratory services and sections, including anatomic pathology, clinical pathology and cytology, microbiology, and parasitology.

  • Anatomic Pathology – Biopsy and Autopsy Services
    The Lab at Ryan

    The Biopsy and Autopsy Services have provided sample interpretation for veterinarians across the nation and abroad for more than 35 years. The high volume of service exemplifies the pursuit of academic excellence and quality diagnostics.

    The Biopsy Services include the general biopsy service and specialty biopsy services, which include dermatopathology, lymphoma subtyping, neuropathology, ophthalmic pathology, osteopathology, and oral pathology.

    The Autopsy Service provides complete gross and histopathologic examinations on patients by referral from veterinarians. Please refer to the guidelines for submission of referral autopsies. Postmortem examinations can also be performed by veterinarians and tissues may be submitted through our Biopsy Service.

    Anatomic Pathology Laboratory Hours:
    • Monday through Friday: 8:00 am to 5:00 pm
    • Phone: 215-898-8857
    • Fax: 215-898-0719
  • Clinical Cytology & Pathology

    Our clinical laboratory provides routine to advanced testing in a wide variety of disciplines including: hematology, clinical chemistry, endocrinology, urinalysis, coagulation, and immunohematology. The cytopathology service, with its team of onsite board-certified pathologists, is also available for collaborative case work and veterinary consultations.

    Laboratory Hours:

    • Monday through Friday: 8:00 am - 5:00 pm
    • Saturday/Sunday: 9:00 a.m. - 1:00 pm

    Cytology submissions by 4 pm will be read same day. STAT submissions arriving by 4:30 pm will be read same day.

    • Laboratory Phone: 215-898-8877
    • Laboratory Fax: 215-898-9352

  • Microbiology

    Our clinical Microbiology Laboratory performs aerobic, anaerobic, fungal, and mycobacterial cultures, along with appropriate antibiotic susceptibility testing for patients of both the Ryan Veterinary Hospital and practices across the US. Our clinical microbiologist is onsite and available for consultations daily. The laboratory has a specific expertise and extensive experience with dermatologic infectious disease and work closely with our dermatopathology and cytology services.

    Laboratory Hours: 

    • Monday through Friday 8:00 am to 5:00 pm
    • Laboratory Phone: 215-898-7858
    • Laboratory Fax: 215-898-0503
  • Parasitology
    Diagnostic Parasitology LaboratoryOur Parasitology Laboratory provides diagnostic services for both large and small animal patients and the Pennsylvania Animal Diagnostic Laboratories (PADLS). Fecal examinations, parasite identifications, quantitative fecal egg counts and serologic testing of vector-borne infections are just a few on the services we are able to provide to submitting veterinarians.

    Laboratory Hours:

    • Monday through Friday: 8:30 am to 4:00 pm 
    • Laboratory Phone: 215-898-7183 
    • Laboratory Fax: 215-573-8115

Contact Us

All laboratory sections are located within the Ryan Veterinary Hospital of the University of Pennsylvania.
3900 Delancey Street
Philadelphia, PA 19104 

Anatomic Pathology Laboratory Hours
Call 215-898-8857
Fax 215-898-0719
Hours: 8-5, M-F

Clinical Cytology & Pathology
Call 215-898-8877
Hours: 8-5, M-F, 9-1, Sa/Su

Call 215-898-7858
Hours: 8-5, M-F

Call 215-898-7183
Hours: 8:30-4, M-F

Diagnostic Team

Anatomic Pathology

Charles Bradley, VMD, DACVP
Assistant Professor, Anatomic Pathology
Head, Autopsy Service

Molly Church, VMD, PhD, DACVP
Assistant Professor, Anatomic Pathology
Anatomic Pathology Residency Program Director

Amy C. Durham, VMD, MS, DACVP
Professor, Anatomic Pathology
Assistant Dean for Education

Elizabeth Mauldin, DVM, DACVP, DACVD
Professor, Dermatopathology
Academic Head of Penn Vet Laboratory of Pathology & Toxicology
Associate Chair, Department of Pathobiology

Katie Mulka, DVM, PhD, DACVP
Assistant Professor, Anatomic Pathology

Enrico Radaelli, DVM, PhD, DECVP
Associate Professor, Anatomic Pathology
Faculty Director, Comparative Pathology Core

Charles-Antoine Assenmacher, DVM, MSc, DACVP
Assistant Professor, Comparative Pathology
Technical Director, Comparative Pathology Core

Hayley Amerman, DVM, DACVP
Anatomic Pathology Fellow

Clinical Pathology

Martina Piviani, DVM, SPCAA, MSc, DACVP (clinical pathology)
Associate Professor, Clinical Pathology
Section Chief, Clinical Pathology

Koranda Walsh, VMD, DACVIM, DACVP
Associate Professor, Clinical Pathology


Stephen Cole, VMD, DACVM (Bacteriology/Mycology, Immunology)
Director of Microbiology Laboratory
Assistant Professor of Microbiology


Caroline Sobotyk, DVM, MSc, PhD
Director, Clinical Parasitology Diagnostic Laboratory
Assistant Professor of Clinical Parasitology

  • Residents and Interns

    Taylor Chan, DVM
    Resident, Anatomic Pathology

    Dhruv Desai, DVM, MVSc, PhD
    Resident, Clinical Microbiology

    Stefano De Arcangeli, DVM, PhD
    Resident, Clinical Pathology

    Nathan Fanzone, VMD
    Resident, Anatomic Pathology

    Devin Fussell, DVM
    Resident, Anatomic Pathology

    Joshua Hargrove, DVM
    Resident, Anatomic Pathology

    Karuna Katariwala, DVM
    Resident, Clinical Pathology

    Victoria Leopardi, VMD
    Resident, Anatomic Pathology

    Lillian Miller, DVM
    Resident, Anatomic Pathology

    Brianna Stoyle, DVM
    Resident, Anatomic Pathology

    All Residents and Interns


About COVID-19 Testing at Penn's Veterinary Diagnostic Laboratory

The PennVet Diagnostic Lab will not be testing the general companion animal population for the SARS-CoV-2 virus.
According to the United States Department of Agriculture (USDA), the testing of companion animals is not recommended. Testing may be done by animal and public health officials if they agree that there is a link to a known human case. If you have such a case, please contact your state animal health official. In Pennsylvania, please call the Pennsylvania Department of Agriculture at 717-787-4737 and ask to speak to someone about testing an animal for SARS-CoV-2.