The Hiwet Clinic in Houston, Texas offers primary care and on-demand lab tests. The clinic accepts self-referrals and is open six days a week. Patients can book their appointment online through Solv, which can reduce wait times. For more information about the Hiwet Clinic, visit their website. The following is a list of services offered. Visiting the clinic is free and easy. You can also call the office to schedule an appointment.