Final answer:
An increased BUN, increased creatinine, and fixed USG typically indicate renal dysfunction, as they suggest compromised kidney filtering ability and urine concentration regulation.
Step-by-step explanation:
An increase in blood urea nitrogen (BUN), an increase in creatinine, and a fixed urine specific gravity (USG) typically indicate renal dysfunction. These laboratory findings suggest an issue with the kidneys' ability to filter blood and regulate urine concentration. A raised BUN and creatinine point towards renal uremia, which occurs when the kidneys are unable to effectively remove waste products from the blood. Fixed USG indicates that the kidneys are also struggling to concentrate or dilute the urine in response to the body's hydration status. Therefore, the correct answer to the question would be a) Renal dysfunction. Conditions like dehydration can cause elevated BUN due to hemoconcentration, but creatinine would not be as significantly impacted unless renal impairment is involved.