To become active again on the Iowa registry, you will need to have any non-reported qualifying employment reported by the employer or will need to challenge and pass both the written and skills competency examinations. In Iowa, CNAs are not required to take the CNA course to challenge the exams. You should call the Iowa Nurse Aide Registry at 515-281-4077 or 515-242-5991 to request contact information for facilities which currently administer the exam in your area.