1200 Valley West Dr. Suite 120, West Des Moines, IA 50266 (515) 226-9559 Referring Providers Contact

Our Staff

Our Philosophy

We utilize a thorough and systematic approach of allergy testing, identifying the cause of your symptoms to relieve you from the daily struggles of living with allergies or asthma. We concentrate in the testing and treatment of allergies, asthma, sinus and other immune system disorders that affect people of all ages. We offer compassionate and effective allergy treatment to help you improve your quality of life and help you become allergy free.


Meet the Staff

At Allergy, Asthma, Sinus Center, P.C., we specialize in the diagnosis, treatment, and management of allergy, asthma and sinus diseases. We will gather a detailed history, perform a physical exam, and determine the most comprehensive and personalized treatment plan for you. Our goal is to provide our patients with the highest quality, evidence based, and cost effective allergy, asthma and sinus care possible.


Dr Agarwal

Dr. Ravinder Agarwal, M.D.

Dr. Agarwal is a distinguished physician with decades of experience in allergy, asthma and sinus care. He is dual board certified in Allergy and Immunology and Internal Medicine. Dr. Agarwal has notable expertise in nasal and ocular allergies, sinusitis, asthma, and anaphylaxis. In addition, he has extensive experience in evaluating food and medication allergies, cosmetic allergies, diseases of the skin, insect sting reactions, and latex allergy.

He was trained in a premier medical school in New Delhi, India (all India Institute of Medical Sciences) and practiced medicine for many years in India. He trained in pediatrics at The Children’s Hospital in Buffalo New York and did his fellowship in pediatric and adult allergy and immunology at The Children’s Hospital in Buffalo and Buffalo General Hospital in Buffalo New York.

Dr. Agarwal is a member of The American College of Allergy, Asthma, & Immunology, the Polk County Medical Society and the American Academy of Allergy, Asthma and Immunology. He is also affiliated with Mercy Medical Center and Iowa Methodist Medical Center. Dr. Agarwal has also been involved with the training of young doctors and other teaching initiatives including adjunct associate professor of internal medicine at Des Moines University.


Crystal Tenborg

Crystal Tenborg, CMA, AE-C
Crystal joined Allergy Asthma & Sinus Center in 2002, as a Certified Asthma Educator by the National Asthma Education Certification Board (NAECB). She works side by side with Dr. Agarwal educating patients about asthma. She has over 12 years of professional experience in the field of allergy. She is an Allied Health Professional and a member of the American Association of Medical Assistants.

Ashley Wiederien

Ashley Wiederien, CMA
Ashley joined Allergy Asthma & Sinus Center in 2013. She is an Allied Health Professional and a member of American Association of Medical Assistants.

Milisa Tyler

Milisa Tyler, CMA, AE-C
Milisa is an Allergy Technician with seven years of professional experience in the area of medical assisting in the field of Allergy and Asthma. Milisa is also certified as an Asthma Educator by the National Asthma Education Certification Board (NAECB). She is an Allied Health Professional and a member of American Association of Medical Assistants.