Mercy – Mercy Clinic Primary Care Winghaven

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: 2223 Technology Dr, Ste 40, O'fallon, MO 63368
Get directions

Phone: (636) 755-4400

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 – 5:00pm
Tuesday	8:00am – 5:00pm
Wednesday	8:00am – 5:00pm
Thursday	8:00am – 5:00pm
Friday	8:00am – 5:00pm

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.

Other testing sites nearby

Mercy-GoHealth Urgent Care – O'Fallon

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Total Access Urgent Care – O'Fallon South Urgent Care

4201 Hwy K, O'Fallon, MO 63368 · (636) 294-8540

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Mercy – Mercy Clinic Primary Care

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Total Access Urgent Care – O'Fallon North Urgent Care

502 S Main St, O'Fallon, MO 63366 · (636) 409-1132

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Mon 8:00am – 8:00pm; Tue 8:00am – 8:00pm; Wed 8:00am – 8:00pm; Thu 8:00am – 8:00pm; Fri 8:00am – 8:00pm; Sat 8:00am – 8:00pm; Sun 8:00am – 8:00pm