Upon noting a serum lithium level of 2.0 mEq/L in a client taking lithium, what is the nurse's immediate action?

In a situation where a serum lithium level of 2.0 mEq/L is noted, the immediate action is to notify the healthcare provider. This high level indicates a risk of lithium toxicity, which can lead to serious health complications. Quick communication with the healthcare provider is crucial because it allows for timely intervention, such as adjusting or stopping the lithium dosage and assessing the patient for signs of toxicity.

While assessing for signs of toxicity is also an important step, the priority is to inform the healthcare provider first so that they can provide specific orders based on the level and any symptoms the client may be exhibiting. Documenting the laboratory report is also necessary, but it does not take precedence over addressing the critical finding. Administering a prescribed dose of lithium at this elevated level is inappropriate and potentially harmful, as it could worsen the client's condition.