The National Board of Nutrition Support Certification (NBNSC) is an independent credentialing board established in 1984 by the American Society for Parenteral and Enteral Nutrition (ASPEN).
Nutrition support is a specialized practice that requires the expertise of multiple health-care professionals including physicians, dietitians, pharmacists, physician assistants, dentists, and nurses. 

NBNSC's credentialing program provides a valuable addition to your professional experience and contributes to excellent care. The Certified Nutrition Support Clinician®(CNSC®) credential identifies you as a qualified nutrition support provider. It is the most widely accepted, visible nutrition support certification with recognition both nationally and internationally.


NBNSC Today 

Stay up-to-date on certification activities and announcements. 

COVID-19 Update: 

Information for the Spring 2021 CNSC Exam Testing Period (Posted January 14, 2021)

The registration window for the Spring 2021 CNSC exam is now open.  Individuals interested in sitting for the CNSC exam can apply here.  All applications must be received by March 17, 2021, no exceptions.  The Spring 2021 testing window is April 24 – May 8, 2021.

Individuals interested in sitting for the Spring 2021 offering of the CNSC exam will have the option to sit for the exam in a live remote proctored setting or at a physical testing center. Information about both options is available in the candidate handbook.  

Live Remote Proctored Exams

  • Candidates should carefully read and review the FAQs for live remote proctored exams at
  • Please be advised that it is the candidate’s responsibility to ensure equipment and workspace meet ALL the requirements for live remote proctoring. If a candidate makes an appointment for live remote proctoring and is unable to test due to not meeting technical requirements or physical requirements of the workspace, the candidate will forfeit their examination fees and will need to follow the transfer policies in place for the exam as listed in the candidate handbook. 
  • Learn more about live remotely proctored exams specific to the ProProctor platform at
  • Technical support that may be required during a live remote proctored exam can be directed to Prometric at, or by phone US and Canada: 800-813-6779; International: +1-443-455-6299. 
  • Questions regarding live remote proctored exam should be directed to the PTC at [email protected].

Exams at In-Person Testing Centers

  • Information on the physical testing centers is continuously updated on the Prometric site at
  • Prometric has actively worked with test sponsors to determine the programs that meet criteria for "essential workforce as defined by the US Cybersecurity and Infrastructure Security Agency (CISA). For the most up-to-date list of these programs, please click here. The CNSC examination offered by the National Board of Nutrition Support Certification (NBNSC) is included in the list under the grouping for Professional Testing Corporation (PTC).  
  • Test centers in North America will be operating under strict social distancing guidelines at this time. For a full list of these procedures, please click here.
  • Details on Prometric and testing site availability is available on their website at We strongly suggest that you check your local, county and state restrictions as to what activities are allowed during this time.