The enzyme encoded by this gene metabolises cortisol to cortisone in the kidney and thereby prevents excessive mineralocorticoid receptor stimulation by cortisol. Deficiency results in clinical symptoms similar to hyperaldosteronism, which is remediable by dexamethasone suppressing cortisol secretion.
| Clinic | Method | Carrier testing |
| Turnaround | 5 days | |
| Specimen type | genomic DNA |
| Clinic | Method | Massive parallel sequencing |
| Turnaround | 25 days | |
| Specimen type | genomic DNA |
| Clinic | Method | Genomic sequencing of the entire coding region |
| Turnaround | 20 days | |
| Specimen type | genomic DNA |
| Clinic | Method | Methylation test |
| Turnaround | 25 days | |
| Specimen type | genomic DNA |