If you have worked as a dialysis technician within the last 18 months, you may be eligible to apply to take the exam to become certified again by using the initial CCHT examination application. If it has been more than 18 months since you last worked as a dialysis technician, you will be considered a new technician and will be required to go through re-training before being eligible to apply to take the CCHT examination. 
 

Yes, a current, or previous supervisor will need to verify 3000 hours of dialysis technician work experience during your 3-year certification period.  If you did not work 3000 hours as a dialysis technician during your certification period, you are not eligible for recertification.

NNCC is your national certification board. NNCC does not issue numbers with your certification. There are some states that require a state registration or certification, and those states may issue a registration or certification number. NNCC will ask for the registration number, if applicable. If you do not have a state registration or certification number, you will leave this question blank on your recertification application.
 

The CCHT-A shows that you are working at an advanced level of practice and have proven your knowledge and skills by passing the CCHT-A examination. The biggest benefit of this credential may be personal satisfaction. There may be benefits offered by your employer for earning this credential, this would need to be discussed with your employer.