A 46-year-old patient presents to the clinic with a complaint of gross hematuria. Approximately one month ago, the patient reported having had a fever and severe sore throat but received no medical treatment. Physical examination reveals mild costovertebral tenderness (CVA). The remainder of the exam was unremarkable. Which laboratory findings would be expected with this condition?
Elevated blood urea nitrogen (BUN)
In this clinical scenario, the patient's history of gross hematuria, fever, and sore throat suggests a possible renal condition, such as glomerulonephritis. Elevated BUN levels are commonly associated with renal impairment or dehydration, which may occur following an infection.
A normal creatinine clearance test would not be expected given the patient's symptoms and presentation. In cases of renal impairment, particularly with hematuria and potential glomerular involvement, creatinine clearance is often decreased, indicating impaired kidney function.
A urine specific gravity of 1.010 indicates a relatively dilute urine and is typically seen in conditions of renal concentrating ability impairment or fluid overload. In the context of glomerulonephritis, one would expect a higher specific gravity due to concentrated urine from dehydration or kidney dysfunction.
Elevated BUN levels are indicative of impaired renal function or increased protein breakdown, both of which can occur due to acute kidney injury or dehydration resulting from the patient's prior illness and current symptoms, making this the most likely finding in this case.
Clear, yellow urine color is generally indicative of normal hydration and kidney function. However, the presence of gross hematuria suggests that the urine would likely be bloody or discolored, reflecting underlying pathology rather than a normal appearance.
The symptoms and clinical findings of this patient suggest a renal condition likely linked to a prior infection. Among the options, elevated blood urea nitrogen (BUN) aligns with the expected laboratory findings, reflecting the potential for renal dysfunction following the patient's illness. The other choices either indicate normal kidney function or are inconsistent with the presentation of hematuria.
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