Fat-soluble vitamins, including vitamins A, D, E, and K, are essential for maintaining normal
body function and metabolism. Fat-soluble vitamin deficiency may lead to bone diseases …

Although vitamin deficiencies are a well-known issue, monitoring of the vitamin status and
diagnosis of vitamin deficiencies in remote regions is a complicated task. Dried blood …

Dried blood microsampling is increasingly used for home-sampling and epidemiological
studies because of its multiple advantages, including an often greatly improved analyte …

Background To date, clinical laboratories face challenges in quantifying retinol from DBS
samples. Disputes arise throughout the whole detection process, encompassing the storage …

Background The retinol isotope dilution (RID) method has been used to evaluate vitamin A
(VA) status in healthy adults and children in low-and middle-income countries (LMIC) and to …

Vitamin D plays a critical role in bone development and maintenance, and in other
physiological functions. The quantitation of endogenous levels of individual vitamin D and its …