was bedeutet low cortisol — can a DNA test help?

Low cortisol (hypocortisolism) can indicate adrenal insufficiency, HPA axis dysregulation, or be a temporary response to chronic stress, poor sleep, or malnutrition. However, a single lab value is just a snapshot—cortisol follows a strong circadian rhythm and fluctuates with acute stressors. A direct-to-consumer DNA test like MyBody-X cannot measure your current cortisol level or diagnose low cortisol. While some genetic variants (e.g., in NR3C1, CRHR1, FKBP5) are associated with stress response, their effect sizes are very small (typically <2% of variance) and not clinically actionable. The provided knowledge context does not include any validated cortisol-related genetic markers for consumer testing. Therefore, relying on a DNA test to understand low cortisol is not evidence-based. If you experience persistent fatigue, dizziness, or other symptoms, consult a physician for proper testing (e.g., ACTH stimulation, salivary cortisol day curve). A DNA test may offer vague insights into stress sensitivity but cannot replace medical diagnosis. Evidence: unclear; marketing claims often overstate the role of single SNPs.