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Detect unmeasured osmoles (toxins, mannitol). Updated 2026-08.
Detect unmeasured osmoles (toxins, mannitol)
Enter your values above to see the result.
For education and screening only — not a substitute for professional medical assessment. Results should be interpreted by your healthcare provider.
Within the typical range. If toxin exposure is suspected, the osmolar gap is the key number — enter measured osmolality.
Outside the normal range — elevated with hyperglycemia, azotemia, or hypernatremia (all expected); low with hyponatremia.
Unmeasured osmoles present — methanol, ethylene glycol (antifreeze), isopropanol, or mannitol. This is a medical emergency: go to the ER immediately.
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This content is a general reference, not medical advice, a diagnosis, or a treatment plan. Do not change your diet, fluids, medicines, or dialysis plan without your nephrologist or renal dietitian. Individual recommendations depend on your labs, medications, conditions, and care plan.