“…However, clinically, blood measurements must be used to assess vitamin E status. Many parameters have been suggested: plasma vitamin E levels(6,10,12,13,18,21,22,24), or vitamin E‐total‐lipid ratio (10,18,21), erythrocyte vitamin E levels(16,20‐23) and different HPH test values (28,30,31). Although a combination of tests is advised (14), such a method has scarcely been studied in preterm infants(10,18,21).…”