A Client Has a History of Hypothyroidism

A client has a history of hypothyroidism.Which laboratory value is the nurse most concerned about?

A) Na⁺ 146 mEq/L
B) K⁺ 3.6 mEq/L
C) Ca²⁺ 8.2 mg/dL
D) Mg²⁺ 1.1 mEq/L