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This one occurred today:- An innocuous telephone enquiry about the amount of sample required for a sweat sodium elicited the answer "Approximately 100 ul", to which the reply was "Oh we've got about two ml". This caused some puzzlement until the sample arrived in the lab - 2 ml of venous blood. -- Dr D G Williams Department of Biochemistry Sunderland Royal Hospital [log in to unmask] %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%