[Plasma copeptin--a multi-purpose diagnostic tool for clinicians?].

Area of Science:

• Biochemistry
• Endocrinology
• Clinical Diagnostics

Context:

• Antidiuretic hormone (ADH) measurement is crucial for diagnosing hyponatremia and polyuria.
• Current ADH determination methods are slow and can yield unreliable results.
• Copeptin, a stable precursor fragment of ADH, is secreted equimolarly with ADH.

Purpose:

• To evaluate copeptin as a rapid and reliable diagnostic marker.
• To compare copeptin determination with traditional ADH measurement.
• To explore the potential of copeptin in diagnosing osmotic disorders and other critical conditions.

Summary:

• Copeptin, a 39-amino acid glycopeptide, is equimolarly secreted with ADH.
• Copeptin assays are significantly faster and more reliable than ADH measurements.
• This improves the diagnostic accuracy for osmotic disorders.

Impact:

• Copeptin offers a promising, efficient diagnostic tool for hyponatremia and polyuria.
• It has potential prognostic value in acute coronary syndrome, cardiac insufficiency, stroke, and septicemia.
• Accelerated and reliable diagnostics can lead to improved patient outcomes in critical care.