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Message: <blockquote data-quote="Countryside_Yoyo_" data-source="post: 1111398" data-attributes="member: 265234">I have an electrolyte wasting disease, and get my potassium checked regularly. There's quite a few things that can give you a false high, such asPutting the tourniquet on too tight or leaving it on too long Making  a fist whilst your blood is being taken -avoid If your arm is in an upward position - lie it flatIf the blood sample hangs around in the surgery before being transported to the lab - for this reason I never have a late afternoon appointment Rupture of blood cells into the sample by the blood being banged about in the tube, either in the surgery or centrifuge.The serum potassium test is the most common one for false highs.</blockquote>

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