Unlike other diuretics, Spironolactone is potassium-sparing. It does not get rid of potassium. It can actually cause potassium to build up in your blood. Please have your doctor check your potassium levels. Too much potassium can cause problems with your heart, such as a very slow heart beat, a thready pulse and weakness. Also, make sure the lab draws two tubes. The first one is a throw-away after the tourniquet is removed. The second one will be sent for analysis. If the lab draw is not done accurately, you could get a false-positive since potassium can leak into the blood because of the tourniquet. Good Luck!