Final answer:
The nurse should document the findings of the client's serum potassium level after CABG surgery.
Step-by-step explanation:
The serum potassium level is a measurement of the concentration of potassium in the liquid portion of the blood (serum). Potassium is an essential electrolyte that plays a crucial role in various physiological processes, including maintaining proper heart and muscle function, conducting nerve impulses, and balancing fluid levels within cells.
The nurse should document the finding of the client's serum potassium level of 4.5 mEq/L after coronary artery bypass graft (CABG) surgery.