Final answer:
The nurse should report the serum sodium level of 110 mEq/L to the provider, as this indicates severe hyponatremia, a critical finding in a patient with SIADH.
Step-by-step explanation:
Signs of Syndrome of Inappropriate Antidiuretic Hormone (SIADH)
The nurse should report a serum sodium level of 110 mEq/L to the provider. SIADH is characterized by the excessive release of antidiuretic hormone (ADH), also known as vasopressin, which increases water reabsorption in the kidneys, leading to fluid retention and hyponatremia (low sodium concentration in the blood). A serum sodium level of 110 mEq/L is significantly lower than the normal range (135-145 mEq/L) and may indicate severe hyponatremia, which can cause neurological symptoms and is a medical emergency.
The other findings listed (2+ deep-tendon reflexes, serum potassium 3.7 mEq/L, and urine specific gravity 1.025) are within normal ranges or expected findings in SIADH. The key concern with SIADH is the hyponatremia caused by dilution due to the inappropriate retention of water, not the direct effect of ADH on electrolytes or urine concentration.