question: My name is Joni Hall I am 57 just during a routine check up, the Dr. found I had a HB of 39 upward to 42. Went to my physician today my heart beat was 62. The Dr. ordered some XRays & blood work up.. Found out I have low pottasium, he ordered a pottasium, should more testing be done such as an echo be done?? This is not the first time my pottasium has been low, so confused