My recent vitamin d3 lab through Heartland Assays was 68.5 when I tested in March 2015. My recent vitamin d3 lab through the local VA Hospital lab was 108.91 ng/ml today. I am still taking the same amount of vitamin d3 and I just cannot figure out why the big difference in results. The VA lab test used fresh blood drawn for other labs also. I got the results in less than two hours. Maybe someone can make sense of the the two results. Thanks.