As you are on H4 VISA, I am guessing that you will be planning to stay here and work as a Physical Therapist. If this is the case then you will have to go for the credential evaluation with TOEFL.
You are not allowed to work on H4 VISA so you will have to get H1B VISA to work as a PT. And the requirement for H1B VISA is to have TOEFL (i.e. 26 on speaking section) and then only you can apply for NPTE and work as a Physical Therapist.
Hope this would be helpful.
By the way, your post should be under following forum:
Physiotherapists Working Overseas / International Accreditation / World Physio News - The Physio Forum - the home of online physiotherapy discussion
Good Luck.