Which laboratory value is used to assess kidney function?

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Multiple Choice

Which laboratory value is used to assess kidney function?

Kidney function is best evaluated by how well the kidneys filter waste from the blood, which is reflected in the level of creatinine in the blood. Creatinine is a waste product produced by muscle metabolism and is normally cleared by the kidneys through filtration. When the glomerular filtration rate drops, creatinine clearance decreases and serum creatinine rises, making it a reliable indicator of how well the kidneys are functioning. In practice, creatinine levels are often used to calculate an estimated GFR, which provides a more precise assessment of filtration capacity. Hematocrit measures the proportion of red blood cells in blood and does not reflect how well the kidneys are filtering. Sodium is an important electrolyte that can be influenced by many factors including fluid status and hormonal control, but it does not directly measure kidney filtration. Glucose levels indicate metabolic status and diabetes risk, not kidney filtration capacity on their own.

Kidney function is best evaluated by how well the kidneys filter waste from the blood, which is reflected in the level of creatinine in the blood. Creatinine is a waste product produced by muscle metabolism and is normally cleared by the kidneys through filtration. When the glomerular filtration rate drops, creatinine clearance decreases and serum creatinine rises, making it a reliable indicator of how well the kidneys are functioning. In practice, creatinine levels are often used to calculate an estimated GFR, which provides a more precise assessment of filtration capacity.

Hematocrit measures the proportion of red blood cells in blood and does not reflect how well the kidneys are filtering. Sodium is an important electrolyte that can be influenced by many factors including fluid status and hormonal control, but it does not directly measure kidney filtration. Glucose levels indicate metabolic status and diabetes risk, not kidney filtration capacity on their own.

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