nutritional disorders
Niacin Deficiency
Diagnosis ofNiacinDeficiency
Clinical evaluation deficiency is clinical and may be straightforward when skin and mouth lesions, diarrhea, delirium, and dementia occur simultaneously. More often, the presentation is not so specific. Differentiating the central nervous system changes from those in Thiamin Deficiency is difficult. A history of a diet lacking If available, laboratory testing can help confirm the diagnosis, particularly when the diagnosis is otherwise unclear. Urinary excretion of N1-methylnicotinamide (NMN) is decreased;<0.8 mg/day (<5.8 mcmol/day) suggests aniacindeficiency. 