Topic Breakdown of SLE Lab Technician Exam

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SLE Lab Technician Sample Test

1 of 5

Which of the following tests is NOT a renal tubular reabsorption test?

Correct Answer:

creatinine clearance

the question asks which test among the options provided is not a renal tubular reabsorption test. to understand why creatinine clearance is the correct answer, it is important to differentiate between the types of renal function tests: tubular reabsorption tests and glomerular function tests.

renal tubular reabsorption tests assess how well the kidney tubules reclaim substances from the filtrate back into the bloodstream. these substances can include electrolytes, water, and other small molecules. these tests are crucial for detecting how well the renal tubules are functioning and are often used to diagnose early stages of renal disease or to monitor the progression of known renal disorders.

on the other hand, glomerular function tests, such as creatinine clearance, evaluate how efficiently the glomeruli — the tiny filters within the kidneys — are removing waste products from the blood. creatinine clearance measures the rate at which creatinine is cleared from the blood by the kidneys. creatinine is a waste product produced from muscle metabolism and is usually filtered out by the glomeruli without being reabsorbed by the tubules. therefore, creatinine clearance is used primarily to assess glomerular function rather than tubular reabsorption capabilities.

the other options listed — osmolarity, specific gravity, and renal blood flow tests — though not exclusively tubular reabsorption tests, do not directly measure glomerular filtration like creatinine clearance does. osmolarity and specific gravity tests evaluate the kidney’s ability to concentrate or dilute urine, which involves both glomerular filtration and tubular reabsorption to some extent. renal blood flow tests assess the blood supply to the kidneys, which indirectly affects all renal functions but is not a direct measurement of tubular reabsorption.

thus, among the options given, creatinine clearance is the only test that specifically measures glomerular function and not tubular reabsorption, making it the correct answer to the question regarding which test is not a renal tubular reabsorption test.