Guide

Midlife weight gain can feel stubborn when sleep gets choppy and stress signals stay high, but steady basics can restart progress.

ACTH-stimulated cortisol results show whether your adrenal glands can raise cortisol on cue and how strong that rise is.

Most labs call suppression “normal” when the morning cortisol after dexamethasone is under 1.8 µg/dL (50 nmol/L), with some labs using higher cutoffs.

Most labs call it normal when morning cortisol drops below 1.8 mcg/dL (50 nmol/L) after a 1 mg dexamethasone dose.

This test checks whether a small dose of dexamethasone turns down cortisol the way it should, which can point toward cortisol excess when suppression doesn’t

A normal rise is cortisol climbing after cosyntropin and hitting your lab’s pass cutoff at 30–60 minutes.

It checks if bedtime dexamethasone lowers morning cortisol; if not, your doctor checks for cortisol excess or test interference.

Most blood checks are collected between 7–9 a.m., or within about an hour of waking, before coffee and hard exercise can shift the number.

High cortisol on more than one properly timed test can point to Cushing syndrome, while a single “high number” often needs repeat testing and context.

Blood cortisol numbers can point toward adrenal insufficiency, yet timing, medications, and the lab method decide what “low” really means.