Abstract / Summary
Background: Serum α-tocopherol depends on lipids, so absolute concentrations misclassify vitamin E status in children with chronic liver disease (CLD). The CALIPER program defined lipid-adjusted E:cholesterol (E:C) and E:triglyceride (E:TG) ratios, but their application in mixed-etiology pediatric CLD using immunoassay has not been reported. Methods: Exploratory single-center cross-sectional study of 66 children (observed age range 4 months–17.9 years) with mixed-etiology CLD. Retinol and total vitamin E were measured by ELISA, whereas the CALIPER reference intervals applied here were established for α-tocopherol measured by HPLC; the two platforms are not interchangeable, so every classification reported is an exploratory application of those cutoffs. Vitamin E status was classified by absolute concentration, E:C (<3.7) and E:TG (<8.5). Cholestatic (n = 15), non-cholestatic (n = 45) and post-transplant (n = 6) groups were compared. Results: Vitamin A was largely preserved (5.2% below WHO). Vitamin E was low in 45.3% by absolute concentration, 62.5% by E:C and 43.8% by E:TG. Of 35 children with a normal absolute vitamin E concentration, 11 (31.4%) were reclassified as low by E:C. Low E:C differed across groups (cholestatic 78.6%, non-cholestatic 63.6%, post-transplant 16.7%; p = 0.030). E:TG was inversely correlated with 25(OH)D (rho = −0.45; p < 0.001). Conclusions: Lipid-adjusted interpretation reclassified a substantial proportion of children whose absolute vitamin E concentration appeared adequate, and the prevalence of a low E:C ratio was lower among post-transplant participants than in the other two groups. In this exploratory cohort, the E:C ratio showed greater potential than the E:TG ratio for lipid-adjusted interpretation of vitamin E status; prospective validation against HPLC-based measurements and established functional indices is required before routine clinical adoption.