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Summary
Dr. Sydney Thayer is an obstetrics and gynecology physician who specializes in maternal and fetal medicine. She completed her medical education at the University of California San Diego School of Medicine and brings nine years of clinical experience to her practice. Her dual specialization allows her to provide comprehensive care for women throughout pregnancy and childbirth, with particular expertise in managing complex maternal and fetal conditions.
Dr. Thayer practices at several locations throughout the Saint Louis, Missouri area, including Barnes Jewish Hospital, Christian Hospital, Missouri Baptist Medical Center, and Memorial Hospital Shiloh in O'Fallon, Illinois. She focuses on caring for women with high-risk pregnancies and those who are pregnant after age 30. Her expertise extends to managing anemia during pregnancy and performing specialized procedures such as fetal ultrasounds and protein urine testing to monitor maternal and fetal health throughout pregnancy.
Dr. Thayer practices at several locations throughout the Saint Louis, Missouri area, including Barnes Jewish Hospital, Christian Hospital, Missouri Baptist Medical Center, and Memorial Hospital Shiloh in O'Fallon, Illinois. She focuses on caring for women with high-risk pregnancies and those who are pregnant after age 30. Her expertise extends to managing anemia during pregnancy and performing specialized procedures such as fetal ultrasounds and protein urine testing to monitor maternal and fetal health throughout pregnancy.
Overview based on verified provider data
Quick Facts
- 9 years of experience
- University Of California San Diego School Of Medicine
- 2 specialties
- 1 area of expertise
- 6 hospital affiliations
- 4 office locations
- Female
Office Locations
Dr. Sydney Marie Thayer has 4 locationsCompare with Similar Doctors
 |  | |  |
| Dr. Sydney Marie Thayer | Dr. Patrick Peter Yeung JR., MD | Kourtney Lynn Hughey | Dr. Noah Harold Hillman, MD |
| Obstetrics & Gynecology | Obstetrics & Gynecology | Nurse Practitioner | Neonatology |
| Accepts New Patients | Accepts New Patients | ||
| 9 Years of Experience | 26 Years of Experience | 25 Years of Experience | |
| No Virtual Visit Option | No Virtual Visit Option | No Virtual Visit Option | No Virtual Visit Option |
| Speaks English | Speaks English | ||
| Saint Louis , MO | Saint Louis , MO | Shiloh , IL | Saint Louis , MO |
| Med School: University Of California San Diego School Of Medicine | Med School: Obstretrics & Gynecology -Georgetown University | Med School: University Of Missouri Columbia School Of Medicine | |
Current Profile | View Profile | View Profile | View Profile |
Insurance Plans Accepted by Dr. Sydney Marie Thayer
Be sure to verify insurance information directly with your doctor's office, as it may undergo frequent changes.
Medical Specialties
Dr. Sydney Marie Thayer has the following 2 specialties
Specialty Expertise
Dr. Sydney Marie Thayer has the following area of expertise
Certifications, License, & Education
9 Years Experience
Dr. Sydney Marie Thayer holds an expired medical license in the states of Illinois and Missouri.
Medical License
Medical Doctor with an expired medical license in the state of Illinois that expired in 2026 and an expired medical license in the state of Missouri that expired in 2026.
Education & Training
Medical School
Graduated from University Of California San Diego School Of Medicine in 2017.
NPI Number
Dr. Thayer's NPI number is 1427581768.
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Frequently Asked Questions
- Where is Dr. Sydney Thayer's office located?
- Dr. Sydney Thayer's office is located at 1 Barnes Jewish Hospital Plz, Saint Louis, MO, 63110.
- Which hospitals is Dr. Sydney Thayer affiliated with?
- Dr. Sydney Thayer is affiliated with Barnes Jewish Hospital, Christian Hospital, Missouri Baptist Medical Center, Oregon Health And Science University Hospital, Barnes Jewish West County Hospital, and Memorial Hospital Shiloh.
- How can I make an appointment with Dr. Sydney Thayer?
- You can find contact information for Dr. Sydney Thayer here on Vitals.
- Does Dr. Sydney Thayer accept virtual/telehealth appointments?
- Dr. Sydney Thayer has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
- Does Dr. Sydney Thayer accept my insurance?
- You can see the insurance plans that Dr. Sydney Thayer accepts on their Vitals profile.
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