If you have teh full version of ePocrates, it has the lab program that gives you information about all lab tests, tehir interpretation, and drugs that may cause abnormal lab values, high or low. And its all cross referenced, you can click on each drug in teh list to read about, or each disease to read about it. For example, a RF factor positive.... you see teh differrential and see that Hep C can cause it, you can click to see what Hep C is. Or if hydralazine causes a high AST, u can click it to see what it is or what its used for.