What is the formula for calculating the renal clearance?
Clearance = urine flow rate x urine concentration / plasma concentration.
Clearance = urine flow rate x plasma concentration / urine concentration.
Clearance = plasma flow rate x urine concentration / plasma concentration.
Clearance = plasma flow rate x plasma concentration / urine concentration.
The Correct Answer is A
Clearance = urine flow rate x urine concentration / plasma concentration. This is the formula for calculating the renal clearance of a substance that is neither reabsorbed nor secreted by the tubules. Renal clearance is the volume of plasma that would have to be filtered by the glomeruli each minute to account for the amount of that substance appearing in the urine each minute.
Choice B is wrong because it has the urine concentration and plasma concentration inverted.
This would give an incorrect value for renal clearance.
Choice C is wrong because it has the plasma flow rate instead of the urine flow rate.
Plasma flow rate is not directly related to renal clearance.
Choice D is wrong because it has both the plasma flow rate and the urine concentration and plasma concentration inverted.
This would give an incorrect value for renal clearance.
Normal ranges for renal clearance vary depending on the substance, age, sex, and body size.
For example, the normal range for creatinine clearance is 85-125 mL/min for males and 75-115 mL/min for females.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Metabolic acidosis is a condition in which there is excess acid in the body fluids.
It causes rapid breathing, confusion, tiredness, headache, and increased heart rate.
Rapid breathing is a compensatory mechanism that helps to lower the carbon dioxide levels and increase the pH of the blood.
Choice B is wrong because decreased respiratory rate would worsen the acidosis by retaining more carbon dioxide and lowering the pH of the blood.
Choice C is wrong because normal respiratory rate would not be adequate to compensate for the metabolic acidosis and would result in acidemia (low blood pH).
Choice D is wrong because irregular respiratory rate is not a typical response to metabolic acidosis and could indicate other problems such as brain injury or drug overdose.
Correct Answer is D
Explanation
Protein intake can increase the excretion of calcium and oxalate in the urine, which can promote the formation of calcium oxalate stones. The client should limit animal protein sources, such as meat, poultry, fish, eggs, and dairy products.
Choice A is wrong because purine-rich foods, such as organ meats, shellfish, and beer, can increase the production of uric acid, which can cause uric acid stones.
Choice B is wrong because a low-calcium diet can increase the absorption of oxalate in the intestine, which can increase the risk of calcium oxalate stones.
The client should consume a moderate amount of calcium from dietary sources, such as milk, cheese, yogurt, and green leafy vegetables.
Choice C is wrong because potassium-rich foods, such as bananas, oranges, potatoes, and tomatoes, can help prevent calcium oxalate stones by increasing the urinary pH and citrate levels.
The client should consume adequate amounts of potassium from dietary sources.
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