Wallach's Interpretation of Diagnostic Tests: Pathways to Arriving at a Clinical Diagnosis (1283 page)

   
Normal range:
see Table 16.83.

TABLE 16–83. Normal Ranges for Vitamin A by Age

   Use

   Assist in the diagnosis of night blindness

   Evaluate skin disorders

   Investigate suspected vitamin A deficiency

   Interpretation

Increased In

   Chronic kidney disease

   Idiopathic hypercalcemia in infants

   Vitamin A toxicity

Decreased In

   Abetalipoproteinemia

   Carcinoid syndrome

   Chronic infections

   CF