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Blood taking method warning

28th July 2008

A report by a team in the UK has shown that if people clench their fists while they are having blood taken it could potentially distort their results.

The team studied 200,000 test results and found that a clenched fist could increase levels of potassium in the blood. Co-author Vanessa Thurlow said many clinicians who took blood had not been told not to use the clenched-fist method: "It seems to be hit or miss whether they get trained to avoid using this procedure."



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