We use the echo and its not uncommon to get weak reactions in the original antibody screens (as we have all heard). To make certain that these reactions are non-specific and not clinically significant we perform panels on the echo and then additional screen using diffrent technology if required. The anitbodies get reported out as solid phase reactions, non-specific. A client of ours is refusing to pay for the additional work-up because they feel it is a problem with our methodology. I have argued the point that all methods have downfalls and will always have something to contend against, but they are set that it is not leagl for us to bill for this testing. I cannot really find information for either side. Really new to billing!!- so maybe I just don't know where to look for this information. Any information would be greatly appreciated.