What is the most common cause of a high osmolal gap in clinical samples?

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Multiple Choice

What is the most common cause of a high osmolal gap in clinical samples?

Explanation:
Osmolal gap reflects unmeasured, osmotically active substances in the blood. The calculated osmolality uses sodium, glucose, and BUN, so anything not included in that calculation but present in the serum will raise the measured osmolality and create a positive gap. Ethanol is a common substance that increases the measured osmolality yet is not part of the calculation, making it the most frequent cause of a high osmolal gap in clinical samples. Other toxic alcohols like methanol or ethylene glycol can also raise the gap, but they are far less common. Uremia raises measured osmolality primarily through BUN, which is already accounted for in the calculation, so it typically does not produce a large osmolal gap.

Osmolal gap reflects unmeasured, osmotically active substances in the blood. The calculated osmolality uses sodium, glucose, and BUN, so anything not included in that calculation but present in the serum will raise the measured osmolality and create a positive gap. Ethanol is a common substance that increases the measured osmolality yet is not part of the calculation, making it the most frequent cause of a high osmolal gap in clinical samples. Other toxic alcohols like methanol or ethylene glycol can also raise the gap, but they are far less common. Uremia raises measured osmolality primarily through BUN, which is already accounted for in the calculation, so it typically does not produce a large osmolal gap.

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