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 B
Explanation
Serum creatinine is a waste product that comes from muscle activity and is normally removed by the kidneys.
When the kidneys are damaged, the serum creatinine level rises.
The glomerular filtration rate (GFR) is a measure of how well the kidneys are filtering the blood and it is calculated from the serum creatinine level.
A normal GFR is 60 or more, while a GFR below 60 may indicate kidney disease.
Therefore, monitoring the serum creatinine level and the GFR can help assess the renal function in CKD.
Choice A is wrong because blood glucose level is not a direct indicator of renal function, although high blood glucose can damage the kidneys over time.
Choice C is wrong because serum albumin level is not a specific marker of renal function, although low serum albumin can be caused by protein loss in the urine due to kidney damage.
Choice D is wrong because white blood cell count is not related to renal function, but rather to immune system activity and infection.
Normal ranges for serum creatinine are 0.6 to 1.2 mg/dL for men and 0.5 to 1.1 mg/dL for women.
Normal ranges for GFR are 90 to 120 mL/min.
Normal ranges for serum albumin are 3.4 to 5.4 g/dL1.
Normal ranges for white blood cell count are 4,000 to 11,000 cells per microliter.
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