Breadcrumb Home Physical Therapist Assistant PTA2058 PTA2058: Clinical Externship I Download as PDF Area of Study Physical Therapist Assistant Credits 9.0 Variable Credits Off This is a 280-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 PTA2046: Advanced Habilitation/Rehabilitation PTA2050: Professional Seminar PTA2057: Physical Therapy through the Lifespan Corequisites PTA2059