Urinary 4-Pyridoxic Acid, Urinary Vitamin B-6 and Plasma Pyridoxal Phosphate as Measures of Vitamin B-6 Status and Dietary Intake in Adults

  • Terry D. Shultz
  • James E. Leklem


As reviewed by Sauberlich (1), a number of studies have been conducted to determine the efficacy of measuring urinary 4-pyridoxic acid and vitamin B-6 excretion levels, as well as plasma pyridoxal phosphate levels, as criteria for assessing vitamin B-6 nutritional status. It has been suggested that urinary vitamin B-6 excretion levels may be reflective only of recent dietary vitamin B-6 intake and may not be indicative of the severity of the deficiency (1).


Protein Intake Dietary Vitamin Protein Ratio High Protein Diet Tryptophan Metabolism 
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Copyright information

© Springer Science+Business Media New York 1981

Authors and Affiliations

  • Terry D. Shultz
    • 1
  • James E. Leklem
    • 1
  1. 1.Department of Foods and NutritionOregon State UniversityCorvallisUSA

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