Schedule Yourself for a prescreen

A prescreen may either be in person or on the phone with a professional patient recruiter to help determine if you will qualify to participate in a study. In-person prescreens often consist of lab work and vitals to see if you qualify. Phone prescreens, which are often used for mental and behavioral health studies, will help determine your eligibility.

The type of appointment you are scheduling – either a phone or in-person prescreen – will be clearly marked on the scheduling system. There is no cost to prescreen and no insurance necessary. Some prescreens may provide compensation for your time.

Receive $25

Healthy Volunteers


Metabolic Screening

Phone Self-Scheduler

Schedule Yourself to Participate in a Study

A study appointment can be made at your convenience online. The scheduling system will have a clear description of criteria which may include or exclude from a study. We recommend that after scheduling you call 210-949-0122, ext. 290 to verify your eligibility. There is no cost to participate in a study and no insurance is necessary. Patients who qualify to screen for a study may receive compensation for time.

GERD Self-Scheduler

Weight-Loss Self-Scheduler

Type 2 Diabetes Self-Scheduler

Renal Impairment Self-Scheduler

Bunion Self-Scheduler

Adult ADHD Self-Scheduler

One-Visit Healthy Volunteers Self-Scheduler

Type 2 Diabetes with Obesity Self-Scheduler

Gout Self-Scheduler

Lupus Self-Scheduler

Malaria Vaccine Self-Scheduler

Flu/COVID-19 Vaccine Self-Scheduler

Pediatric ADHD Self-Scheduler

Flu Vaccine Self-Scheduler

COVID/RSV Self-Scheduler

High Cholesterol Self-Scheduler

Type 1 Diabetes Self-Scheduler

Osteoarthritis of the Knee Self-Scheduler

About Us

In addition to free screenings, CTT conducts studies in many therapeutic areas that impact our community such as obesity, diabetes, fatty liver, PTSD and vaccines.

Learn More