The AANPCB offers a certification for primary care NPs, as well as an exam for Emergency Nurse Practitioner (ENP), a credential for family nurse practitioners (FNPs) specializing in emergency care. The ANCC offers a number of nurse practitioner certifications, including an examination for the credential Adult-Gerontology Acute Care Nurse Practitioner Certification (AGACNP-BC) for ACNPs who specialize in treating acutely ill adults.