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[Dexamethasone suppression test using saliva cortisol measurement in affective disorders]
1Department of Psychiatry, Shiga University of Medical Science, Japan.
Yakubutsu, Seishin, Kodo = Japanese Journal of Psychopharmacology
|June 1, 1987
Summary
Saliva cortisol testing offers a viable alternative to serum testing for the dexamethasone suppression test (DST). This new method accurately assesses cortisol levels, proving effective in diagnosing melancholia in psychiatric patients.
Area of Science:
- Endocrinology
- Psychiatry
- Clinical Chemistry
Context:
- The dexamethasone suppression test (DST) is a key diagnostic tool for melancholic depression.
- Traditional DST relies on serum cortisol measurements, which can be invasive and inconvenient.
- Developing non-invasive alternatives for cortisol assessment is crucial for patient comfort and compliance.
Purpose:
- To develop and validate a direct assay for salivary cortisol measurement.
- To adapt the assay for performing the DST using saliva samples.
- To evaluate the diagnostic accuracy of salivary DST for melancholia.
Summary:
- A modified commercial assay kit was used to directly measure saliva cortisol, showing a high correlation (0.94) with serum cortisol levels.
- The DST was performed on 124 psychiatric patients using saliva samples collected over a 16-hour period after dexamethasone administration.
- Calculating the cortisol secretion rate from salivary measurements significantly improved sensitivity and specificity for diagnosing melancholia compared to single-point measurements.
Impact:
- Saliva cortisol measurement provides a sensitive and specific method for DST, comparable or superior to serum-based tests.
- This non-invasive approach simplifies the DST procedure, making it more practical for clinical settings.
- The findings support the clinical applicability of salivary cortisol testing in psychiatric diagnostics and endocrinology.