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 ["B","C","D"]
Explanation
Hypercalcemia is a condition in which the calcium level in the blood is above normal.
This can cause various symptoms, such as confusion, constipation, and bradycardia (slow heart rate).
These are the clinical manifestations that the nurse would expect to observe in a client with hypercalcemia.
Choice A is wrong because muscle spasms are not a common symptom of hypercalcemia.
In fact, hypercalcemia can cause muscle weakness and pain.
Choice E is wrong because polyuria (excessive urination) is not a direct symptom of hypercalcemia, but rather a result of kidney problems caused by hypercalcemia.
Hypercalcemia can make the kidneys work harder to filter the excess calcium, leading to dehydration and thirst.
However, this does not necessarily mean that the client will have polyuria.
Normal ranges for calcium levels in the blood are 8.5 to 10.2 mg/dL (milligrams per deciliter) or 2.1 to 2.6 mmol/L (millimoles per liter).
Correct Answer is D
Explanation
Nasogastric suction removes gastric secretions that contain potassium, leading to a loss of potassium from the body. This can cause hypokalemia, which is a low level of potassium in the blood.
Choice A is wrong because Addison’s disease causes hyperkalemia, which is a high level of potassium in the blood.
Choice B is wrong because tissue damage can release potassium from the cells into the blood, causing hyperkalemia.
Choice C is wrong because uric acid level is not related to potassium level.
Uric acid is a waste product of purine metabolism that can cause gout or kidney stones if elevated.
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