The CNS exam is for nutrition professionals who want the Certified Nutrition Specialist credential from the Board for Certification of Nutrition Specialists (BCNS). This page has free practice sets by topic, worked answers to sample questions and the verified exam facts: 200 multiple-choice questions, 4 hours, in-person testing and a passing scaled score of 600. Our content is written with AI tools, and the exam facts come from official BCNS sources.
The CNS has 200 questions and takes about 4 hours[1] (Board for Certification of Nutrition Specialists, verified Oct 25, 2026).
Numbers in brackets link to the official sources listed under Sources & last verified. Dates that have passed are removed automatically.
| Item | Detail | Source · Verified |
|---|---|---|
| Number of questions | 200 multiple-choice questions[1] | Board for Certification of Nutrition Specialists · Oct 25, 2026 |
| Time limit | 4 hours[1] | Board for Certification of Nutrition Specialists · Oct 25, 2026 |
| Passing score | 600 on a 100–1,000 scaled score[1] | Board for Certification of Nutrition Specialists · Oct 25, 2026 |
| Retake policy | Retake via the CNS Reexamination Application and reexamination fee[1] | Board for Certification of Nutrition Specialists · Oct 25, 2026 |
| Validity | 5 years from the test date to meet all program requirements[1] | Board for Certification of Nutrition Specialists · Oct 25, 2026 |
| Renewal | Every 5 years; 75 CE credits plus annual fee[2] | Board for Certification of Nutrition Specialists · Oct 25, 2026 |
| Delivery | In person at ISO-Quality Testing sites[1] | Board for Certification of Nutrition Specialists · Oct 25, 2026 |
| Score release | About 4–6 weeks after the exam, by email[1] | Board for Certification of Nutrition Specialists · Oct 25, 2026 |
| Registration deadline (December 2027 administration) | October 4, 2027[3] | Board for Certification of Nutrition Specialists · Oct 25, 2026 |
| Registration deadline (June 2027 administration) | April 5, 2027[3] | Board for Certification of Nutrition Specialists · Oct 25, 2026 |
| Testing window (December 2026 administration) | December 5–13, 2026[3] | Board for Certification of Nutrition Specialists · Oct 25, 2026 |
| Testing window (June 2027 administration) | June 5–13, 2027[3] | Board for Certification of Nutrition Specialists · Oct 25, 2026 |
According to Board for Certification of Nutrition Specialists, “The CNS examination contains 200 multiple-choice, single-answer questions, and will cover the broad spectrum of basic and applied nutritional science.”[1]
The Certified Nutrition Specialist (CNS) credential is awarded by the Board for Certification of Nutrition Specialists (BCNS). The exam covers the broad spectrum of basic and applied nutritional science. Expect questions that range from biochemistry and micronutrients to assessment, counseling and research methods.
Delivery and format. You take the exam in person at ISO-Quality Testing sites in the United States and several other countries. It has 200 multiple-choice questions, each with a single correct answer, and you have 4 hours to finish.
Scoring. Results are reported as a scaled score from 100 to 1,000, and you need at least 600 to pass. Score reports are emailed about 4 to 6 weeks after the exam administration.
After you pass. Passing the exam does not finish the process. You must meet all remaining CNS program requirements within 5 years of your test date. After you are certified, you renew every 5 years by earning at least 75 continuing education credits that meet BCNS requirements and paying an annual fee.
Eligibility and retakes. BCNS sets the education and experience requirements, and this page does not summarize them. Read the current BCNS candidate handbook before you apply. If you do not pass, you retake the exam by submitting the CNS Reexamination Application with the reexamination fee. Fees and eligibility rules can change, so treat the handbook and theana.org as the final word.
Prepare for the CNS - Certified Nutrition Specialist Exam exam with our free practice test modules. Each quiz covers key topics to help you pass on your first try.
These are practice questions written for this site, not questions from the real exam. Each explanation shows why the right answer is right and why the others are wrong.
Question: A practitioner recommends a probiotic supplement containing Lactobacillus rhamnosus GG. This strain has the strongest evidence base for which clinical application?
Answer: B. Reducing the duration of antibiotic-associated diarrhea
Explanation:
B is correct. Lactobacillus rhamnosus GG is one of the most studied probiotic strains. Its clearest clinical support is for preventing antibiotic-associated diarrhea and shortening how long it lasts. It also has support for some infectious diarrheas, especially in children.
A is wrong because the effects of probiotics on blood pressure are small and inconsistent, and blood pressure is not a recognized use of this strain. C is wrong because trials on insulin sensitivity show mixed, modest results across many strains, with no strong effect specific to this strain. D is wrong because cholesterol-lowering claims rest mainly on other strains with bile salt hydrolase activity, and even there the effect is modest.
Rule: probiotic evidence depends on both the strain and the outcome. Match the exact strain to the condition it was tested for.
Question: Which approach is most effective for mastering diet planning in Certified Nutrition Specialist Exam?
Answer: A. Combining theoretical study with practical application and regular review
Explanation:
A is correct. Diet planning is an applied skill. You need to know the principles and then use them on realistic cases, such as building a day of meals for a client with a specific condition. Regular review keeps that knowledge available under exam time pressure.
B is wrong because memorized definitions without understanding break down on scenario questions. C is wrong because cramming right before an exam gives weak long-term recall. D is wrong because work experience alone can leave gaps in theory and in topics you rarely see at work.
Rule: on study-method questions, the option that combines understanding, application and repeated review is usually right. Options built on words like only or solely are usually wrong.
Question: Which of these vitamin-related conditions is caused by an autoimmune disease?
Answer: D. Pernicious Anemia
Explanation:
D is correct. Pernicious anemia comes from autoimmune gastritis. The immune system attacks the parietal cells of the stomach and intrinsic factor, the protein needed to absorb cobalamin in the ileum. The problem is absorption, not intake, so it can develop even when the diet is rich in cobalamin.
A is wrong because scurvy results from too little vitamin C. B is wrong because pellagra comes from niacin deficiency. It is usually dietary and sometimes linked to tryptophan problems or certain drugs, but it is not autoimmune. C is wrong because ariboflavinosis is riboflavin deficiency, usually from poor intake or alcohol use.
Rule: most classic vitamin deficiency diseases are dietary. When the cause is autoimmune or poor absorption, think of cobalamin and intrinsic factor. Treatment has to bypass or overcome the absorption problem.
Start by reading the BCNS candidate handbook so you know the rules for test day. Then take a short set in each group below without notes, to see where you are weakest.
For each question you miss, write down the rule behind the right answer, not just the letter. Check that rule against a textbook or primary source. Go back to your weakest sets every week. In the final weeks, do long mixed blocks to build stamina for a 4-hour exam with 200 questions, and practise your pacing so no single question takes far longer than the rest. Our questions are written with AI tools and are not real exam items. Use them for practice, and use official BCNS material for the rules.
The CNS exam has 200 multiple-choice questions, each with a single correct answer, and you have 4 hours to finish. It covers the broad spectrum of basic and applied nutritional science. You take it in person at ISO-Quality Testing sites in the United States and several other countries, not at home.
You need a scaled score of at least 600. BCNS reports results on a scale from 100 to 1,000, so your score is not a simple count of correct answers. Score reports are emailed to candidates about 4 to 6 weeks after the exam administration.
The December 2026 window runs December 5–13, 2026, and its applications were due October 5, 2026. The June 2027 window runs June 5–13, 2027, with applications due April 5, 2027. The December 2027 window runs December 4–12, 2027, with applications due October 4, 2027. Confirm the dates on theana.org before you make plans.
You can retake it by submitting the CNS Reexamination Application with the reexamination fee. BCNS sets the fee and any timing rules, and both are listed in the current candidate handbook, so check it before you pick a new testing window. Before you retest, go back over the topics you found hardest.
After passing, you must meet all remaining CNS program requirements within 5 years of your test date. After you are certified, you renew every 5 years by earning at least 75 continuing education credits that meet BCNS requirements and paying an annual fee.
No. Practice Test Geeks writes these questions with AI tools to match the topics the exam covers. They are not real exam items, and BCNS does not endorse them. Use them to find weak areas and practise your reasoning, and use the BCNS handbook for official rules, dates and fees.
How we verify: editorial & fact-checking policy. Report an error: contact us.