Biological Variation in Hormone Concentrations
Endocrine Laboratory Assessment and Functional Testing
Biological Variation in Hormone Concentrations
Hormone concentrations vary within an individual and between individuals because of secretion patterns, binding proteins, clearance and physiological conditions.
Separate biological and analytical effects
Hormone results depend on secretion rhythms, binding, clearance, sample handling and the measurement method. Reference intervals and decision thresholds serve different purposes. Assay-specific interpretation is especially important near low concentrations and when results conflict with the clinical picture.
Interpreting the mechanism
Distinguishing biological variability from analytical error helps determine whether repeat testing or standardized sampling is informative.
Define the testing question
Dynamic tests examine a regulated response under specified conditions. Their protocols, contraindications and thresholds require clinical oversight. A glossary explanation supports understanding and does not provide a self-testing or medication-adjustment protocol.
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