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Primary Culture of Rat Adrenocortical Cells and Assays of Steroidogenic Functions

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Cortisol: ACTH ratio to test for primary hypoadrenalism: a pilot study.

Mark K V Lee¹, Samuel Vasikaran, James C G Doery

¹Department of Internal Medicine, Royal Perth Hospital, , Perth, Western Australia, Australia.

Postgraduate Medical Journal

|June 5, 2013

Summary

The cortisol to ACTH ratio effectively diagnoses primary hypoadrenalism with 100% accuracy. However, this ratio cannot differentiate secondary hypoadrenalism from normal adrenal function, necessitating further research.

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Area of Science:

Endocrinology
Diagnostic Medicine

Background:

The standard short Synacthen test (SST) is the conventional method for diagnosing primary hypoadrenalism.
Measuring simultaneous plasma cortisol and adrenocorticotrophin hormone (ACTH) offers a potentially safer and more convenient alternative.

Purpose of the Study:

To evaluate the utility of the plasma cortisol:ACTH ratio as a first-line diagnostic test for hypoadrenalism.
To determine the sensitivity and specificity of the cortisol:ACTH ratio in distinguishing primary hypoadrenalism.

Main Methods:

A retrospective study analyzed data from 349 patients who underwent both SST and simultaneous baseline plasma cortisol and ACTH measurements.
The plasma cortisol:ACTH ratio was calculated for each patient.
Final diagnoses were confirmed by SST results and clinical note reviews.

Main Results:

A cortisol:ACTH ratio <3 demonstrated 100% sensitivity and specificity for diagnosing primary hypoadrenalism.
Patients with primary hypoadrenalism consistently had a ratio <3.
Patients with normal adrenal function or secondary hypoadrenalism had ratios >3, with ratios >15 observed in normal adrenal function cases, though overlap existed between secondary hypoadrenalism and normal function.

Conclusions:

The cortisol:ACTH ratio is a reliable indicator for diagnosing primary hypoadrenalism.
The ratio's utility is limited as it cannot differentiate secondary hypoadrenalism from normal adrenal function.
Larger prospective studies are recommended to validate the cortisol:ACTH ratio's diagnostic reliability, especially in early-stage primary hypoadrenalism.