Thanks for the question!
Board certification is voluntary for physical therapists. However, earning certification in a clinical specialty could open up opportunities for career advancement. The American Board of Physical Therapy Specialties (ABPTS) offers certification in nine specialty areas, including cardiovascular and pulmonary, clinical electrophysiology, and geriatrics. To be eligible for certification, candidates must be licensed and have completed at least 2,000 clinical practice hours in their specialty area. Eligible candidates who pass an exam are awarded specialty certification. Certified specialists must be re-certified after ten years.
Hope this helps and good luck!