A patient has been referred to have their kidney function assessed due to concerns about their recent lab results. Which test would provide comprehensive information on the patient's glomerular filtration rate and renal function?
Urinalysis
Serum creatinine and blood urea nitrogen (BUN) levels
Complete Blood Count (CBC)
Liver function tests
The correct answer is 'Serum creatinine and blood urea nitrogen (BUN) levels' because these tests measure the concentration of waste products in the blood, specifically creatinine and urea nitrogen, which are filtered by the kidneys. High levels can indicate reduced kidney function as the filtration rate decreases, allowing these substances to accumulate in the bloodstream. GFR is an excellent indicator of kidney function, but it is not measured directly; instead, it is estimated from the serum creatinine with an equation that accounts for age, body size and gender. Complete Blood Count (CBC) is not specific to kidney function but rather evaluates overall health and screens for a variety of disorders by examining the components of blood, including both white and red blood cells. Urinalysis is a broad test that assesses urine for multiple disorders but alone doesn't provide comprehensive information on the glomerular filtration rate.
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