Ongoing care and support made


Call: (314) 645-4434

Infusion Center

Saint Louis Rheumatology’s Infusion Center provides a comfortable and convenient setting for patients requiring infusion therapy. Our experienced team administers a variety of treatments, including biologics and other advanced medications, to help manage your condition effectively. We prioritize patient safety and comfort, ensuring a positive experience during each visit. Contact us to learn more about our infusion services.

Our Infusion Suite

  • Available 5 days a week
  • Supervised by highly-specialized doctors and registered nurses
  • Equipped with crash carts and hospital-grade medical supplies
  • Designed for comfort with drinks, blankets, magazines, and free Wi-Fi

We are currently infusing the following medicines:

  • Actemra (Tocilizumab)
  • Benlysta (Belimumab)
  • Cimzia (Certolizumab Pegol)
  • Cosentyx (Secukinumab)
  • Entyvio (vedolizuman)
  • Krystexxa (Pegloticase)
  • Ocrevus (Ocrelizumab)
  • Orencia (Abatacept)
  • Prolia (Denosumab)
  • Remicade (Infliximab)
  • Reclast (Zoledronic Acid)
  • Rituxan (Rituximab)
  • Simponi Aria (Golimumab)
  • Stelara (ustekinumab)
  • Entyvio (vedolizuman)

If your doctor currently prescribes one of the medicines above for you and you need to find a place to receive an infusion, our infusion department would be able to accommodate you. If you would like to know more information or would like to schedule an infusion, please feel free to call our office at (314) 645-4434.


Our clinic offers cutting-edge ultrasound technology to aid in the diagnosis and management of rheumatic diseases. Ultrasound imaging helps us visualize joints and soft tissues in real-time, allowing for accurate assessment and treatment planning. Our skilled technicians and rheumatologists work together to ensure precise and efficient imaging services. Schedule your ultrasound appointment with us today.

The right care based on your individual needs.

Tonya is a registered diagnostic medical sonographer.  She joined our practice in 2016 after receiving her Associates Degree in Applied Science of Diagnostic Medical Sonography.  Tonya is registered with the American Registry for Diagnostic Medical Sonographers.

Tonya conducts ultrasounds of hands, wrists, feet and ankles to aid your medical team in the diagnosis of inflammatory arthritis.  She also collaborates with the practitioners in ultrasound guided joint injections.

Recently there is evidence that ultrasound detects synovitis (inflammation of the joint lining) that can be undetected on clinical examination.  Detection and classification of synovitis and detection of bone erosions are important in clinical decision making.  In routine rheumatology practice, ultrasound of the small joints of the hands and feet accurately detects synovitis and allows classification of the extent and activity of inflammatory disease as well as superior detection of erosions compared to radiography.

Labs & Diagnostics

Quest Diagnostics has a private testing location within our office to accommodate only Saint Louis Rheumatology’s patients.  This allows patients the convenience to obtain laboratory tests the same day as their visit.  Patients may also acquire standing order lab tests at this facility if ordered by one of the Saint Louis Rheumatology’s providers.


Mon-Tue: 8:30-4:30
Wed: 9:00 – 4:30
Thu-Fri: 8:30-4:30


520 S. Elm Ave.
St. Louis, MO 63119
Call Us: +1-314-645-4434
Fax: +1-314-645-3801



Call or email today! 314-646-0688 or [email protected]

  • Saint Louis Rheumatology Research seeks participants with Systemic Lupus who are experiencing an inadequate response to current treatment.
  • Saint Louis Rheumatology seeks participants with Rheumatoid Arthritis who have experienced an inadequate response or intolerance to 1 or more biologic therapies. Including but not limited to Enbrel, Humira, Remicade, Simponi Aria, Cimzia, Kevzara, Orencia, Actemra and/or Rituxan.

Saint Louis Rheumatology Research, a division of Saint Louis Rheumatology Associates, P.C., was established in 2002 after absorbing a successful research center in the area. We partner with leading pharmaceutical companies that conduct studies in the US and global markets to achieve FDA approval of new therapies.  Our goal is to provide our patients with the newest innovative treatments.

Our major strength lies in our dedicated, highly experienced research team. Our staff has a combined research experience of over 30 years. Our research team is trained in accepted standards of Good Clinical Practice, Code of Federal Regulations, and the International Conference on Harmonization guidelines. We have established a professional working relationship with many of the major Contract Research Organizations including: Parexel, PPD, PRA, ICON, Omnicare, Covance, IQVIA, Kendell, Clintrials, and BBCI. In addition, we have worked with the following sponsors: AbbVie, Amgen, AstraZeneca, Bertek, Bristol-Myers Squibb, Eli Lilly, Gilead, GlaxoSmithKline, Genentech, Hoffman La-Roche, Novo-Nordisk, Novartis, Pfizer, Purdue Pharma, R-Pharma, TAP Pharmaceuticals, and Yamanouchi.


We strive to provide high quality data in a timely, ethical, and efficient manner by assuring our clinical trials are conducted in a professional manner while adhering to the high standards of the federal, state, and local agencies.

Research Staff

  • Laci Hueffmeier, MA, CCRC Certified Clinical Research Coordinator
  • Chad M Ronholm, M.D. Sub-Investigator, Board Certified in Rheumatology
  • Joseph A. Stauber, M.D. Sub-Investigator, Board Certified in Rheumatology
  • Beatrice A. Bernhart, PA-C, MPAS Sub-Investigator
  • Sarah M. Wilmsmeyer, PA-C Sub-Investigator
  • Michael Hessel, PA-C Sub Investigator
  • Trisha Spector, PA-C Sub Investigator
  • Rachael Meuth, PA-C Sub Investigator
  • Megan Isaacson-Schmid, PA-C Sub Investigator

I had my first visit today..everyone was very sweet and easy to talk to. The nurse, P.A., and the doctor took their time and it didn’t feel rushed at all. They are very throughout, as well. I’m so glad I found this place!

Shelly P.

I love Clayton Medical Associates, especially Dr. Budd & Beatrice Bernhart. They’ve been working with me for almost 10 years now and we’ve come a long way together.

Karen G.

Dr. Chad Ronholm has been very knowledgeable and very straight forward with me. He’s also been very direct about my treatment plan which is huge considering what my previous rheumatologist done. I’m very satisfied with the care I’m receiving and would definately recommend him to anyone needing a rheumatologist.

Melissa H.