Testing Services Knowing your status is important to find the best path forward – no matter the result. We offer: Free & Confidential HIV/STI Testing: Available at the Antoine Clinic (5815 Antoine Dr.) —walk-ins welcome! Call (832) 927-7350 to schedule an appointment today, and visit the Antoine Clinic page for more information. Testing123 Mobile Testing: If you can’t make it to our clinic, our mobile testing service offers free HIV and syphilis tests at your preferred location in both Harris County and Montgomery County. Text (281) 962-8378 to schedule. Rapid HIV Testing: Quick and accurate results in as little as 60 seconds. Comprehensive STI Screenings: Testing for syphilis, gonorrhea, chlamydia, and other sexually transmitted infections. For more testing options in your area, visit the Additional Resources page. I’d like to… Protect Myself Get Tested Start Treatment Learn More