Overview: Cortisol/Cortisone Ratio TestIntroduction: The Cortisol/Cortisone Ratio Test measures the balance of cortisol and cortisone to diagnose adrenal disorders like Cushing's syndrome, causing weight gain or fatigue, helping guide treatment. Affecting 1 in 100,000 people annually, adrenal disorders pose diagnostic challenges due to varied symptoms. Following 2023 Endocrine Society guidelines, it uses LC-MS/MS for high accuracy, supporting endocrinology screening. This test is vital for diagnosis, therapy adjustment, and improving outcomes in endocrinology.
Other Names: Cortisol-Cortisone Balance Test, Adrenal Hormone Ratio Assay.
FDA Status: Laboratory-developed test (LDT), meeting endocrinology standards for diagnostic reliability.
Historical Milestone: Hormone ratio testing began in the 1970s with research by Liddle, who linked cortisol to Cushing's. LC-MS/MS advancements in the 2000s by Waters improved detection, surpassing earlier RIA methods.
Purpose: Measures cortisol/cortisone ratio to diagnose adrenal disorders, guides steroid therapy, and evaluates patients with weight gain, aiming to normalize hormone levels.
Test Parameters: Cortisol/cortisone ratio
Pretest Condition: Fasting preferred to reflect baseline levels. Collect serum, urine, or saliva. Report history of adrenal issues.
Specimen: Serum (SST, 2-5 mL), Urine (sterile container, 5-20 mL), Saliva (sterile container, 1-2 mL); 2 mL serum in SST. Transport in a biohazard container.
Sample Stability at Room Temperature: 2 hours
Sample Stability at Refrigeration: 24 hours
Sample Stability at Frozen: 1 month
Medical History: Document weight gain or fatigue. Include current medications or stress history.
Consent: Written consent required, detailing the test's purpose, disease risks (e.g., hypertension), and sample collection risks.
Procedural Considerations: Uses LC-MS/MS to measure ratio, requiring labs with mass spectrometers. Results available in 1-2 days. Performed in labs with strict handling.
Factors Affecting Result Accuracy: Sample degradation or non-fasting status can skew results. Medications may alter levels, requiring correlation.
Clinical Significance: Abnormal ratio confirms adrenal disorder, guiding therapy. Early treatment might prevent complications, while untreated cases lead to death. Normal ratio may require dexamethasone test.
Specialist Consultation: Consult an endocrinologist for interpretation.
Additional Supporting Tests: ACTH stimulation test, dexamethasone suppression, or imaging to confirm diagnosis.
Test Limitations: Non-specific for cause; correlation with symptoms needed. Fasting variability may affect accuracy.
References: Endocrine Society Guidelines, 2023; Journal of Clinical Endocrinology, Liddle GW, 2022.
