The severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) virus and resulting COVID‐19 pandemic present important diagnostic evaluation challenges. These range from understanding the value of signs and symptoms in predicting possible infection, assessing whether existing biochemical and imaging tests can identify infection and people needing critical care, and evaluating whether new diagnos...

Vitamin D and Bone Health  What is Vitamin D?  Vitamin D, first identified as a vitamin early in the 20th century, is now recognized as a prohormone. It is a group of fat-soluble secosteroids that is naturally present in very few foods, responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and many other biological effects. Vitamin D plays an important ro...