Certified Dialysis Nurse Practice Test 2026 - Free Dialysis Nurse Practice Questions and Study Guide

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What does parathyroid hormone primarily increase in the blood?

Potassium levels

Calcium levels

Parathyroid hormone (PTH) plays a crucial role in maintaining calcium homeostasis in the body. Its primary function is to increase the concentration of calcium in the blood. PTH achieves this through several mechanisms: it promotes the release of calcium from bones, increases renal tubular reabsorption of calcium in the kidneys, and stimulates the activation of vitamin D, which enhances intestinal absorption of calcium. These actions collectively elevate blood calcium levels, which is essential for various physiological processes, including muscle contraction and blood clotting.

While PTH does affect phosphate levels by promoting its excretion in the urine, the hormone's most significant and direct influence is on calcium levels. The other options, such as potassium and sodium, are regulated by different hormones and mechanisms unrelated to PTH's primary function.

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Phosphate levels

Sodium levels

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