Gulf Coast Diagnostics is a diagnostic facility located within the Spinal Center Clinics. Headed by Rachel Jones, Gulf Coast Diagnostics is your one stop shop for diagnostic needs.. Drug - Alcohol - Hair Testing,Paternity DNA Testing,Employee / DOT Physicals,Drug Free Workplace Programs,Mobile and After Hours Collections,Onsite Drug Testing,Pre-employment Drug Screening,Random Drug Screening,Coast Guard Drug Screens,Probation Drug Screening,Breath Alcohol Testing,Work Physicals,Specimen Shipment to Certified Laboratories.