Erin O'Brien, MMS, PA-C

About

Erin O’Brien, MMS, PA-C chose fertility care on a clinical rotation taken at the same office where she now works. During her physician assistant training she rotated through Reproductive Endocrinology and Infertility at Shady Grove Fertility’s Chesterbrook location, and says in the practice’s own interview that it was there she “discovered how meaningful and impactful this work can be.” She joined the practice in January 2026.

Get her role straight before anything else: O’Brien is a physician assistant, a non-physician clinician. Her profile shows no physician board certification line - only her name and the PA-C credential. She does not write stimulation protocols, decide between IUI and IVF, or perform egg retrievals or embryo transfers. What she carries is the procedural and follow-through half of a cycle: the scans, the insemination, the uterine and tubal tests, the biopsies, the urgent visits, the lab review that feeds a physician’s decision.

Her training is Pennsylvania-only: a Bachelor of Science in Biology at Widener University in Chester, then the Master of Medical Science physician assistant program at Drexel University in Elkins Park. Before that, she worked as an Emergency Medical Technician and as a Rehabilitation Technician - hands-on patient care roles the practice credits for her clinical skills. The EMT background is not decorative here; one of the duties listed on her profile is evaluating patients for urgent concerns such as pain or bleeding, which is exactly what goes wrong during stimulation.

She now cares for patients at two offices, Chesterbrook, Pennsylvania and Newark, Delaware. The practice publishes nothing further about her: no graduation years, no total years in clinical practice, no subspecialty certification beyond the PA-C credential, and no prior employer names.

Clinical Expertise

The practice itemizes her responsibilities at Shady Grove Fertility; all of the following are its own list rather than an inference:

• Ultrasound: baseline scans at the start of a cycle, monitoring scans that track follicle growth and lining through treatment, and obstetric ultrasounds in pregnant patients
• Intrauterine insemination (IUI): performs the procedure itself
• Hysterosalpingogram (HSG): the X-ray test of the uterine cavity and fallopian tubes
• Saline sonogram and mock embryo transfer (SIS/MET): saline-enhanced ultrasound of the cavity, and the practice transfer that maps the cervical route before a real embryo transfer
• Gynecologic procedures, including endometrial biopsy
• Urgent evaluation of patients presenting with pain or bleeding during treatment
• Physical examinations, review of laboratory results, and assistance in clinical decision-making - the last phrase is the practice’s, and it describes support for the physician’s judgment rather than independent diagnosis

Why Choose Erin O’Brien

She was trained on this campus, in this program. Her REI rotation was done at Chesterbrook, so the monitoring cadence, the lab workflow and the team’s division of labor are things she learned inside this practice. For a patient making five or six early-morning visits in one cycle, the person doing the scan and relaying the findings is the practical measure of continuity.

Emergency-medical background matched to the riskiest part of a cycle. Ovarian hyperstimulation, torsion and abnormal bleeding present as pain, and a clinician who has worked as an EMT has been trained to sort urgent from routine quickly. Her profile lists urgent pain-and-bleeding evaluation among her routine duties, which is unusual to see written down for a fertility clinic.

She handles the procedures most patients meet only once. HSG, saline sonogram and mock transfer are the tests that decide how a transfer day is planned, and they are on her list - so a patient can be seen by the same clinician for cavity assessment, insemination and monitoring.

Nothing is claimed here that the sources do not support. Her page’s testimonial block displays praise for other physicians (Dr. Harris and Dr Griffith), not for her, and it is not used as evidence about her care. Likewise, no outcome figure on this site belongs to her: the SART 2023 rates shown for this clinic are reported for the Pennsylvania network entity (ClinicPKID 2029, SART number 0317), which aggregates several offices, count IVF cycles, and are never broken out by an individual physician assistant.

Professional Affiliations

Certified physician assistant (PA-C) - a non-physician credential; her profile lists no physician board certification, and none is assumed here. She is a member of the American Academy of Physician Assistants. Her qualification is the Master of Medical Science physician assistant degree from Drexel University in Elkins Park, Pennsylvania, following a biology bachelor’s degree at Widener University. The practice does not publish her graduation years or her total clinical experience before joining in January 2026.

Suitable For

• Patients in a stimulated cycle who need baseline and monitoring ultrasounds between physician visits
• IUI cycles, where she performs the insemination
• Uterine cavity and fallopian tube assessment before or during treatment - HSG or saline sonogram
• Patients scheduled for an embryo transfer who will have a mock transfer first, the procedure she is listed as performing
• Anyone who develops pain or bleeding mid-treatment and needs an urgent evaluation rather than a callback
• Patients in either Chesterbrook or Newark, DE, since she sees patients at both offices

One booking note: she is listed at two offices in two states, so the location of a given monitoring appointment should be confirmed at scheduling rather than assumed to be Chesterbrook. Our sources also carry no image for her - the practice’s only official photo is a placeholder - which is why this page shows none.