The Histopathology and Electron Microscopy Laboratory is part of the laboratory complex of the Department of Pathology and Laboratory Medicine. The Histopathology Section is located on the third floor, Office A-391, and the Electron Microscope Unit is in the basement Office BB-11 of the Medical Sciences Campus Building Dr. Guillermo Arbona-Irrizary, at the Puerto Rico Medical Center grounds.


Working Hours

The regular working hours are from 8:00 am to 4:30 pm, Monday through Friday.


Services Offered

The Histopathology and Electron Microscopy Laboratory processes the human tissues obtained during surgery or autopsy, which arrive for consultation and/or diagnosis. They can arrive  as a H&E stained slide, formalin-fixed specimen or specimen embedded in paraffin (specimen block). The following services are available for the processing and analysis of the specimen:

  • Consultation and slide review
  • Immunohistochemistry
  • Special stains
  • Immunofluorescence
  • Electron microscopy


Laboratory Staff & Contact Information


Name                                                    Phone


Diana Negrón, MD, FCAP, FASCP               (787) 758-2525 ext. 1338 / 1355 / 1377

Laboratory Director


María S. Correa, MD                                    (787) 758-2525 ext. 1330 / 1355 / 1377

Technical Supervisor                                    (787) 754-0710 – FAX


Keila L. Rivera, MD, FCAP, FASCP              (787) 758-2525 ext. 2385  / 1344

Molecular Pathologist


María J. Marcos, MD, FCAP                         (787) 758-2525 ext. 1331



Damarys S. Santiago                                    (787) 758-2525 ext. 1377



Nelson Santiago                                            (787) 758-2525 ext. 1004  / 1377



Carlos J. Rosa                                               (787) 758-2525 ext. 1377



Anginette Lebrón                                          (787) 758-25252 ext. 1377



Evelyn López                                                 (787) 758-2525 ext. 1355

Administrative Assistant



Laboratory Accreditation

Health Care Financing Administration (CLIA Certificate #40D0658324)

Puerto Rico Department of Health (Lic. 596)