Our first priority is the health, wellness and safety of everyone who walks through our doors.

Bryn Mawr Medical Specialists Association is open for medically necessary office visits and procedures only. BMMSA as a corporation is taking all necessary precautions and following public health safety guidelines in regards to the COVID-19 pandemic.

TeleMedicine appointments are now available. Please contact your physicians office for eligibility, additional information, and with any concerns or questions.

As per order of the Commonwealth of Pennsylvania, any person entering our office building is required to wear a face mask at all times. Patients will not be permitted to enter the building without a face mask.

All patients should expect to be phone screened by Bryn Mawr Medical Specialists Association staff for COVID-19 symptoms or exposures prior to their appointment and again upon arrival. Patients should also expect to be temperature screened upon arrival in the office.

If your answer to any of the following questions is “Yes”, we ask that you call to reschedule your appointment.

In the past 14 days, have you developed any fever, cough or shortness of breath?
In the past 14 days, have you developed any of the following new symptoms?

  • Body aches or muscle pains?
  • Chills or repeated shaking with chills?
  • Headache?
  • Sore throat?
  • New loss of taste or of smell?
  • Have you, or anyone you have close contact with, been recently referred for COVID-19 testing?

In the past 14 days, have you traveled outside of PA? If “Yes”, please call the office to notify us of travel BEFORE your appointment. Patients recently returning from travel restricted states or countries will be asked to reschedule their appointment.

For the safety of our staff and other patients, patient family members or companions are not permitted at this time to accompany patients to their appointments (unless medically necessary or the patient is a minor). Bryn Mawr Medical Specialists Association respectfully asks family members or companions to wait outside or safely in their vehicle.

We encourage all of our patients to visit the CDC website and Main Line Health COVID-19 Response website to read more about everyday preventative measures and for the most up to date guidance regarding the Coronavirus (COVID-19). If you are concerned that you may have the Coronavirus (COVID-19), please contact your local Health Departments.

If you have any questions regarding our policy and your appointment, please call your doctor’s office.

Rita L. Ritsema, M.D.



  • Gastroenterology

    Board Certified in 1986
  • Internal Medicine

    Board Certified in 1989


301 West Chester Pike
Suite 204
Havertown, PA 19083

Phone: (610) 525-9570
Fax: (610) 527-8805

Education & Training

Medical School

Boston University School of Medicine, Boston, MA.


Thomas Jefferson University Hospital, Philadelphia, PA


Thomas Jefferson University Hospital, Philadelphia, PA


  • Bryn Mawr Hospital
  • Lankenau Hospital
  • Paoli Hospital
  • BMMSA Endoscopy Center

Societies & Memberships

  • American College of Physicians; 1989
  • American Gastroenterological Association; 1987

Teaching & Research

  • Clinical Instructor of Medicine
    Thomas Jefferson University Hospital, Philadelphia, PA. July 1,1986 to July 1,1987
  • Undergraduate Distinction Work in Biology (Comparative Endocrinology)
    Boston University: Sept 1,1977 to May 20,1979
    Advisor: Ian P. Callard, PhD.
  • National Science Foundation Undergraduate Research Participation Program
    Boston University: August 15,1978
    “Evolution of Hormonal Control of Vertebrate Reproduction” ( Dr. Ian P. Callard, Advisor)
  • Laboratory for Human Reproduction and Reproductive Biology
    Harvard Medical School, Boston, MA: June 1,1979 to Sept 1,1980
    Advisor: Robert E. Carraway, PhD


Carraway, R.E., Ruane, S.E., Ritsema, R.L. “Radioimmunoassay For Lys8, Asn9,Neuotensin 8-13: Tissue and Subcelluar Distribution of Immunoreactivity in Chickens.” (Submitted to the Journal of Biological Chemistry, June, 1982).

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