osmolality serum
Measures dissolved particles in blood to assess fluid balance, hydration, and kidney function.
What This Test Measures
Specimen & Collection
Biomarkers Included (2)
Click any biomarker for detailed information
The serum osmolal gap (osmol gap) is calculated as the difference between measured and calculated serum osmolality. An elevated osmol gap indicates the presence of unmeasured osmotically active substances in the blood, most commonly toxic alcohols such as methanol, ethylene glycol, or isopropanol. It is a critical calculation in the emergency evaluation of suspected poisoning, unexplained metabolic acidosis, or altered mental status. A normal osmol gap effectively rules out significant toxic alcohol ingestion. It is also used alongside the anion gap to narrow the differential diagnosis in metabolic acidosis.
CD19 is a marker found on B lymphocytes, white blood cells that produce antibodies and fight infections. A CD19 cell count measures the number of B cells in your blood or bone marrow. Abnormally low CD19 counts may indicate immunodeficiency, leukemia, or complications from certain medications or treatments. Elevated counts can suggest chronic lymphocytic leukemia or other lymphoproliferative disorders. This test is particularly useful in diagnosing blood cancers and immune disorders.
This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Always consult with a qualified healthcare provider regarding any medical condition or treatment plan.
Lab results should be interpreted by a licensed healthcare provider in the context of your complete medical history. Processing times may vary by laboratory. Charges will not be submitted to insurance, Medicare, or Medicaid. Direct-access lab testing is not available in NY, NJ, or RI.
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