Which statement correctly identifies the causes of excess water in the blood?

Which statement correctly identifies the causes of excess water in the blood?

• A. Excess fluid intake
• B. All of the above
• C. Low urine output due to kidney failure
• D. Hormonal problems such as SIADH

Answer: (B)

Excess water in the blood happens when intake, retention, or reduced excretion of water tips the balance toward too much circulating fluid. Taking in more fluid than the kidneys can remove increases the amount of water in the bloodstream. If kidney function is impaired and urine output falls, water stays in the body, raising blood volume. Hormonal problems like SIADH cause the body to retain more water by releasing too much antidiuretic hormone, which makes the kidneys reabsorb water and dilute the blood. Each of these scenarios can raise total body water, so the statement that includes all of them is the best answer: all of the above.

Excess water in the blood happens when intake, retention, or reduced excretion of water tips the balance toward too much circulating fluid. Taking in more fluid than the kidneys can remove increases the amount of water in the bloodstream. If kidney function is impaired and urine output falls, water stays in the body, raising blood volume. Hormonal problems like SIADH cause the body to retain more water by releasing too much antidiuretic hormone, which makes the kidneys reabsorb water and dilute the blood. Each of these scenarios can raise total body water, so the statement that includes all of them is the best answer: all of the above.