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Investigations
Laboratory tests similar to both ARF and CRF:
Blood test:
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Complete blood count
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BUN or blood urea nitrogen: It increases during ARF.
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Serum creatinine: There may be abnormalities with ARF.
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Creatinine clearance: It is a test used to measure the glomerular filtration rate. Abnormal values are recorded in ARF.
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Serum potassium: Abnormal levels are seen in kidney failure.
Urinalysis:
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The urine is examined by its physical, chemical and microscopic components. This is done by two methods, by a 24-hour urine collection and a clean catch urine specimen. Abnormalities are seen with ARF.
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In the early stages, there are no signs or symptoms and lab tests may be the only method of diagnosing CRF.
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Tests also required for CRF include:
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Kidney ultrasound to detect kidney stones or obstruction
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Biopsy
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