10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The CCN exam has 150 questions and runs 3 hours.
These 10 free CCN questions are organized by exam domain, so you can see how each part of the Certified Clinical Nutritionist blueprint is tested. Reveal the answer and explanation under each question.
A client presents with macrocytic anemia and progressive numbness in both feet. Serum vitamin B12 and serum folate both fall within the laboratory reference range. Which additional test BEST differentiates vitamin B12 deficiency from folate deficiency?
Correct answer: A - Methylmalonic acid
A client with persistent night blindness shows no improvement after three months of vitamin A supplementation, and serum retinol remains low. Deficiency of which nutrient MOST likely explains the poor response?
Correct answer: C - Zinc
A client with type 2 diabetes managed on a sulfonylurea reports new muscle fatigue and reduced exercise tolerance. Within the CCN framework, which nutrient is MOST commonly depleted by oral hypoglycemic agents?
Correct answer: D - Coenzyme Q10
Deficiency of which vitamin can simultaneously impair the activation of vitamin B6, reduce MTHFR activity in the folate cycle, and limit the conversion of tryptophan to niacin?
Correct answer: B - Riboflavin (B2)
Osteocalcin directs calcium into bone and matrix Gla protein inhibits its deposition in arterial walls. Both proteins remain inactive until gamma-carboxylated. Which vitamin is required for that carboxylation step?
Correct answer: A - Vitamin K
Dihomo-gamma-linolenic acid (DGLA) is the direct precursor of which eicosanoid group?
Correct answer: A - Series 1 prostaglandins
Mitochondrial superoxide dismutase requires which mineral cofactor?
Correct answer: C - Manganese
A client began an intensive dietary intervention five weeks ago and wants objective evidence of change. Which marker BEST reflects glycemic control over the preceding two to three weeks?
Correct answer: B - Fructosamine
Urinary estrogen metabolite testing returns a low 2-hydroxyestrone to 16-alpha-hydroxyestrone ratio. Within the CCN framework, this pattern is interpreted as:
Correct answer: C - An unfavorable pattern of estrogen metabolism
Whole licorice root can produce sodium retention, hypertension, and hypokalemia through mineralocorticoid-like activity. Which preparation removes the constituent responsible for these effects?
Correct answer: D - Deglycyrrhizinated licorice (DGL)
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