Certification (CSO) General Information

Certification (CSO) General Information

What is a CSO?

The Oncology Nutrition Dietetic Practice Group has worked together with the Commission on Dietetic Registration to create a Board Certification credential (CSO) for Registered Dietitians in Oncology Nutrition. The first exam was given in 2008. CSO stands for Board Certified Specialist in Oncology Nutrition. A recommended minimum of two years of clinical practice with documentation of 2,000 hours of practice experience in the oncology care setting is required. For more information, please consult the Commission on Dietetic Registration.


How to Become a CSO

Steps to take:

  1. Consult the CDR website for up-to-date information and the timeline. For additional questions, please call the Commission on Dietetic Registration at 1-800-877-1600 x5500.
  2. Register for the test.  Sign up to take the exam here.
  3. Study outline.  Begin reviewing the Test Specifications/Content Guidelines obtained from the practice analysis.
  4. Study for exam.  Using references identified from the item writers and others as preferred, and begin reviewing material.
  5. Sit for the exam, offered on the computer at testing centers around the country.  The exam is now being offered year-round.  


Find a CSO

To find a Board Certified Specialist in Oncology (CSO) click here,   If you are a current CSO, please update your information so we can provide the most current information for individuals seeking oncology registered dietitians.

To find out cool and useful information about how many CSOs in each state and region, click here.


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Page Updated: February 2021