I did read this online:
t is easy to obtain inaccurate measurements of your blood potassium levels. It’s very likely that your blood sample has been “hemolyzed,” where the pressure of drawing blood into a vial or syringe breaks open the delicate walls of red blood cells. These cells leak their concentrated amounts of potassium into the plasma and other parts of blood, so hemolyzation will give false high potassium readings. For this reason, elevated potassium levels may be difficult to dermine without further medical attention.”

I hope the blood draw is not too traumatic for either of you and you have normal levels this time.