My lab gave the normal range for homocysteine (Hcy) as 0-15 umol/L. Whereas, Dr. McCormick, in his book Great Bones (p. 165) says, "Levels higher than 8umol/L can contribute to inflammation." He goes on to say, "When levels go above 15 umol/L, bone mineral density declines, creating a two-and-a-half-fold increase in fracture risk. Females with Hcy higher than 18 umol/L may have twice the risk of fracturing a hip..."