Vitamin B12 - Ordered to help in diagnosing the cause of macrocytic anemia

Vitamin K1 -  deficiency may be induced by obstructive icterus, obstructive liver disease, malabsorption due to celiac disease, pancreatitis, diarrhea, and antibiotic abuse; may be used to treat blood clotting disorders, bone metabolism disorders, and hemorrhagic disorders of newborns. In humans, deficiency of vitamin K leads to decreased concentrations of circulating, active coagulation factors, and often results in bleeding. Vitamin K nutritional status is implicated in osteoporosis. human epidemiological and intervention studies suggest that vitamin K may reduce bone loss in osteoporotic people and decrease fracture risk.

Vitamin D, 25-hydroxy - tests are used to determine if bone malformation, bone weakness, or abnormal metabolism of calcium (reflected by abnormal calcium, phosphorus or PTH tests) is occurring as a result of a deficiency or excess of vitamin D. Because vitamin D is a fat-soluble vitamin and is absorbed from the intestine like a fat, vitamin D tests are sometimes used to monitor individuals with diseases that interfere with fat absorption, such as cystic fibrosis and Crohn's disease, to assure that they have adequate amounts of vitamin D. Vitamin D tests also are used to determine effectiveness of treatment when vitamin D, phosphorus, calcium, and/or magnesium supplementation is prescribed.