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Guy's clearly need educating about 1) thyroxine overdose, 2) the (theoretical) effect of dilution on FT4 3) The legal and practical implications of giving such advice particularly for small labs. I tried in the distant past - perhaps you have a go! Aubrey Blumsohn >Guy's were phoned for a second time on day 3, and the consultant >paediatrician was told to 'ask the lab to dilute the sample so that an >accurate result for fT4 could be obtained'. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%