The varieties of language you use in different areas of your life are known as speaking or writing styles. Some particularly specialized styles, such as those used in the courtroom, or poetry, or the operating room, are known as registers.
The United States National Institutes of Health recommends testing vitamin A levels in people with celiac disease at diagnosis. This is because vitamin A deficiency is common in celiac disease. Deficiency can result from incomplete digestion, absorption, or metabolism. Normal absorption of vitamin A first requires digestion, or releasing, from food protein in the stomach.
Halfdanarson and colleagues reported in the January 2007 edition of Blood that iron-deficiency anemia can be detected in 46% of subclinical celiac disease cases, with the higher prevalence in adults rather than children. Vitamin B12 deficiency is reported in untreated celiac disease patients at rates of 8% to 41%.