Why is ACTH 1-34 preferred in adrenal testing?

Directly stimulates cortisol production, giving clear adrenal response

Short fragment avoids variability seen with full ACTH

Produces standardized, reproducible results across different laboratories worldwide

Lower risk of allergic reactions than full-length ACTH

Targets adrenal cortex without unnecessary extra peptide regions

Better sensitivity for diagnosing adrenal insufficiency accurately early

Preferred because dosing and timing protocols are well-established

Minimizes cross-reactivity issues in modern immunoassays used clinically

Gives predictable cortisol peak for reliable interpretation clinicians