Clinical and Technical Aspects in Free Cortisol Measurement

Area of Science:

• Endocrinology
• Clinical Chemistry
• Analytical Chemistry

Background:

• Accurate cortisol measurement is crucial for diagnosing adrenal insufficiency and optimizing stress dose therapy.
• Total cortisol levels can be unreliable due to variations in binding proteins like albumin and corticoid-binding globulin.
• Current antibody-based immunoassays lack the molecular specificity needed for precise adrenocortical function assessment.

Purpose of the Study:

• To review recent advancements in measuring bioactive free cortisol.
• To discuss clinical specimens and analytical technologies for cortisol assessment.
• To highlight the importance of accurate free cortisol levels in clinical practice.

Main Methods:

• Review of current literature on cortisol measurement techniques.
• Discussion of antibody-based immunoassays and their limitations.
• Exploration of mass spectrometry coupled with chromatography for enhanced specificity and sensitivity.

Main Results:

• Mass spectrometry offers superior specificity and sensitivity compared to immunoassays for steroid profiling.
• Accurate free cortisol measurement is essential for reducing misdiagnosis risks.
• Technological advancements are improving the ability to characterize adrenocortical function.

Conclusions:

• Free cortisol measurement is clinically significant, especially in adrenal insufficiency.
• Mass spectrometry represents a cutting-edge technology for precise steroid analysis.
• Further development and application of advanced analytical methods are warranted for improved patient care.