Breadcrumb Home Physical Therapist Assistant PTA2048 PTA2048: Clinical Externship I Download as PDF Area of Study Physical Therapist Assistant Credits 8.0 Variable Credits Off This is a 240-hour unpaid clinical externship through which students perform and validate their professional competencies under the direct supervision of a license physical therapist or physical therapist assistant. Pass/Fail. Prerequisites PTA2025: Therapeutic Interventions II PTA2046: Advanced Habilitation/Rehabilitation PTA2047: Essentials of Clinical Care Corequisites PTA2049