Overview: Cortisol Saliva TestIntroduction: The Cortisol Saliva Test measures cortisol in saliva to assess adrenal function, linked to stress or Cushing's syndrome, causing fatigue or weight gain. Following 2023 AACE guidelines, it uses an immunoassay for high sensitivity, aiding in endocrine screening. This test is critical for guiding diagnosis, treatment, and improving outcomes in endocrinology for patients with suspected adrenal disorders.
Other Names: Salivary Cortisol Assay, Adrenal Function Test.
FDA Status: Laboratory-developed test (LDT), meeting endocrinology standards for diagnostic accuracy.
Historical Milestone: Salivary cortisol testing began in the 1980s with adrenal research. Immunoassays emerged in the 1990s, and by the 2000s, high-sensitivity assays improved accuracy.
Purpose: Diagnoses adrenal disorders like Cushing's syndrome, guides treatment, and monitors cortisol levels in patients with fatigue or weight gain.
Test Parameters: 1. Cortisol
Pretest Condition: No fasting required. Collect saliva at any time, preferably late evening. Report symptoms like fatigue or weight gain, and list medications like steroids.
Specimen: 1-2 mL saliva (sterile container). Transport in a biohazard bag within 24 hours.
Sample Stability at Room Temperature: 24 hours
Sample Stability at Refrigeration: 48 hours
Sample Stability at Frozen: Not frozen
Medical History: Document fatigue, weight gain, or history of adrenal disorders. Include current medications, especially steroids or hormone therapies.
Consent: Written consent required, detailing the tests purpose, diagnostic implications, and potential need for adrenal therapy.
Procedural Considerations: Uses an immunoassay to measure salivary cortisol levels. Results are available in 1-2 days, enabling rapid clinical decisions.
Factors Affecting Result Accuracy: Stress, oral contamination, or improper storage can affect results. Timing of collection impacts accuracy.
Clinical Significance: Elevated cortisol levels indicate Cushing's syndrome, prompting therapy. Low levels suggest adrenal insufficiency, requiring supplementation.
Specialist Consultation: Consult an endocrinologist for result interpretation. A stress management specialist referral is advised for stress-related cases.
Additional Supporting Tests: ACTH test, serum cortisol test, or adrenal imaging to confirm adrenal disorders.
Test Limitations: Results may be affected by stress or improper collection timing. Clinical correlation is required.
References: AACE Adrenal Guidelines, 2023; Journal of Clinical Endocrinology, Nieman LK, 2022.
