The Serum osmolality looks at concentration of particles in blood. It is done for: very high sugar, low sodium, poisoning.
General health information, not a diagnosis. In an emergency, call 102. Always consult a qualified health professional.
Very high sugar, low sodium, poisoning.
No fasting needed. Laboratory-specific; see the reference range on your report. High or positive may mean: Dehydration, very high sugar. Low or negative may mean: Water excess. General information, not a diagnosis. Results must be interpreted by a qualified health worker.
Concentration of particles in blood.
Blood
Dehydration, very high sugar.
Water excess.
Reference ranges vary by lab, age and sex — always use the range printed on your own report.
Consult a doctor to interpret results — a single test does not make a diagnosis.
Uses your location once to list the nearest facilities. Nothing is stored.
What does the Serum osmolality measure?
Concentration of particles in blood.
Why is the Serum osmolality done?
Very high sugar, low sodium, poisoning.
Do I need to fast for the Serum osmolality?
No fasting needed.
What does a high or positive Serum osmolality mean?
Dehydration, very high sugar.
What does a low or negative Serum osmolality mean?
Water excess.
What is the normal range for the Serum osmolality?
Laboratory-specific; see the reference range on your report.
Why is Serum osmolality done?
Very high sugar, low sodium, poisoning.
Do I need to prepare or fast for Serum osmolality?
No fasting needed. Laboratory-specific; see the reference range on your report. High or positive may mean: Dehydration, very high sugar. Low or negative may mean: Water excess. General information, not a diagnosis. Results must be interpreted by a qualified health worker.
SI text CC BY 4.0; decoder reference data (cited per range); LOINC codes free with attribution (notice included).
Sources: SI health summary (own words); MedlinePlus Lab Tests and CDC as references