What serum electrolyte level could indicate a risk for lithium toxicity in clients taking lithium carbonate?

A sodium level of 130 mEq/L could indeed indicate a risk for lithium toxicity in clients taking lithium carbonate. Lithium's clearance from the body is closely tied to sodium levels; when sodium levels drop, lithium can accumulate in the body, leading to toxicity. This is particularly critical because both sodium and lithium are processed in a similar manner by the kidneys. In conditions of low sodium (hyponatremia), such as the scenario presented with a sodium level of 130 mEq/L, the body can become more sensitive to lithium, increasing the risk of adverse effects.

Maintaining balanced electrolyte levels is essential for individuals on lithium therapy, and monitoring sodium levels is a key component of safe management. Therefore, identifying hypernatremia and maintaining adequate hydration is crucial to minimize the risks associated with lithium use and prevent toxicity.