Warning over blood-taking method
People who take blood have been warned not to get the patient to tightly clench their fist during the procedure.
UK researchers who examined 200,000 blood test results found clenching then relaxing the fist could raise potassium levels, potentially confusing results.
Raised potassium levels can indicate kidney or heart problems, the Annals of Clinical Biochemistry study said.
A UK expert said clenching was an outdated practice and staff taking blood should not ask patients to do so.Kwa habari zaidi, bofya hapo chini.
http://news.bbc.co.uk/2/hi/health/7525932.stm
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