Mercy – Mercy Clinic Primary Care

STD/STI testing location in O'fallon, Missouri.

Verify with the clinic before visiting. Hours, services, fees and appointment rules change. Call ahead to confirm. This directory is for information only and is not medical advice. In an emergency, call 911.

Address: 300 Winding Woods Dr, Ste 214, O'fallon, MO 63366
Get directions

Phone: (636) 614-3280

Website: https://www.mercy.net/

Tests listed

Chlamydia Test
Conventional HIV Test
Gonorrhea Test
Hepatitis A Test
Hepatitis B Test
Hepatitis C Test
Herpes Test
Rapid HIV Test
Syphilis Test
TB Test

Cost and payment

Donations Accepted, Medicaid Accepted, Sliding Scale, Medicare Accepted, Fee, Insurance Accepted.

Hours

Monday	8:00am – 4:30pm
Tuesday	8:00am – 4:30pm
Wednesday	8:00am – 4:30pm
Thursday	8:00am – 4:30pm
Friday	8:00am – 4:30pm

Appointment required: Yes

Other services

STI treatment.

Languages: English

Type: Community Based Organization

Source: CDC NPIN listing. Last updated by source: 2025-11-10. Page built 2026-11-03.

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