Blood potassium level is normally 3.6 to 5.2 millimoles per liter (mmol/L). So, a value of 5.6 is above the normal range, but marginally. Commonly the raised levels are caused by the rupture of blood cells in the blood sample during or shortly after the blood draw. The ruptured cells leak their potassium into the sample. This falsely raises the amount of potassium in the blood sample, even though the potassium level in the body is actually normal. Hence a repeat blood test is advised.
The most common cause of genuinely high potassium (hyperkalemia) is kidney failure. It can also be transiently raised due to consumption of food high in potassium. So, recheck your value and consult your doctor.
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