The VitDAL team have published an important paper this week which describes a novel technique to measure total 25(OH)D and 3-epi-25(OH)D in dog serum. An important finding of this work was that the 3-epi-25(OH)D concentrations were relatively low compared to the total 25(OH)D concentrations. The study also reported a reference range for free 25(OH)D concentrations. This work is critically important for laying the foundations for our future studies on vitamin D metabolism in veterinary patients and populations and represents a major achievement for Emma Hurst who led this work. The paper can be accessed at this link.