A nurse is reviewing a client’s laboratory results prior to administering the client’s medications. The nurse notes that the client’s lithium level is 2.0 mEq/L.
Which of the following findings should the nurse expect?

This is because the client has hypothyroidism, which means their thyroid gland does not produce enough thyroid hormone. Levothyroxine is a synthetic form of thyroid hormone that can replace the missing hormone and normalize the TSH level. The client’s TSH level is 8.9 mIU/L, which is above the normal range of 0.4 to 4.0 mIU/L. This indicates that the client’s current dosage of levothyroxine is insufficient and needs to be increased.

Choice A is wrong because thyroid ablation therapy is a treatment for hyperthyroidism, not hypothyroidism.

Thyroid ablation therapy involves destroying part or all of the thyroid gland with radioactive iodine or surgery, which reduces the production of thyroid hormone.

This would worsen the client’s condition and symptoms.

Choice C is wrong because lovastatin is a statin drug that lowers cholesterol levels. Hypothyroidism can cause high cholesterol levels, but this is usually corrected by levothyroxine therapy. Replacing lovastatin with cholestyramine, a bile acid sequestrant that also lowers cholesterol levels, would not address the underlying cause of hypothyroidism and would not improve the client’s TSH level.

Choice D is wrong because restricting the intake of iodized salt would not help the client with hypothyroidism. Iodine is an essential element for the synthesis of thyroid hormone, but most people in developed countries get enough iodine from their diet.

Hypothyroidism is usually caused by autoimmune disease, not iodine deficiency.

Muscle irritability. A client with a lithium level of

2.0 mEq/L has severe lithium toxicity, which can cause muscle irritability, tremors, seizures, and other neurological symptoms. The normal therapeutic range for lithium is 0.8-1.2 mEq/L.

Choice B is wrong because constipation is not a sign of lithium toxicity, but rather a possible side effect of lithium therapy at lower doses.

Choice C is wrong because hypoglycemia is not a sign of lithium toxicity, but rather a possible complication of diabetes or other conditions that affect blood sugar levels.

Choice D is wrong because increased blood pressure is not a sign of lithium toxicity, but rather a possible risk factor for cardiovascular disease or other conditions that affect blood vessels.