Osmometery in Medicine

Osmometers in the Medical Sector

A clinical osmometer measure the concentration of dissolved particles (solutes) specifically in body fluids like blood, urine, and plasma. This measurement, is crucial for diagnosing and monitoring various medical conditions, particularly those related to fluid and electrolyte balance. Freezing point depression osmometers are the most common type used in clinical laboratories.

Clinical Chemistry

Measuring serum osmolality helps diagnose and manage conditions like diabetes insipidus or dehydration. Analysing the difference between calculated and measured serum osmolality (osmolar gap) can indicate the presence of certain toxins or metabolic disturbances.

Diagnostics

Osmometry helps in the diagnosis of various diseases such as diabetes insipidus or kidney disease. In the Kidney Function Assessment, Osmolality tests are crucial for evaluating kidney function and detecting imbalances in fluid or electrolyte levels.

Therapy Monitoring

Osmometers are used to monitor the effectiveness of infusion therapies and ensure the correct dosage of medications and help assess a patient's response to treatment, particularly in conditions affecting fluid and electrolyte balance.

Fields of Application

Osmolality measurements are used to assess fluid and electrolyte imbalances, diagnose conditions like diabetes insipidus, and monitor patients undergoing dialysis or receiving intravenous fluids. This measurement provides also valuable insights into fluid and electrolyte balance for the kidney function.

Osmolality testing can help identify the presence of toxins like antifreeze or rubbing alcohol in the body, as these substances can significantly alter the osmolality of body fluids. A high plasma osmolality can rarely be due to large amounts of alcohol in the blood. The difference between the osmolality measured in the laboratory and the value calculated from the sodium, potassium, glucose and urea (above) can give an indication of the amount of alcohol present.

Osmolality measurements are used to track the effectiveness of treatments that affect fluid and electrolyte balance, such as diuretic therapy or the administration of osmotically active medications.

The calculated and measured osmolality can be compared to determine if there are other particles present (in addition to sodium, potassium, glucose and urea) that contribute to the measured serum osmolality. The difference between measured and calculated (estimated) osmolality is called the “osmotic gap” or “osmolal gap”. An increase in the osmotic gap (greater than 10) indicates the presence of other substances such as toxic alcohols, aspirin, or mannitol.
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Useful External Links

>> Physiology, Plasma Osmolality and Oncotic Pressure <<
Maulik M. Shah; Pujyitha Mandiga. [PubMed]