My daughter had short synacthen test as she has very low cortisol (200 - normal range is over 400) and diagnosis of CFS following glandular fever. This test was normal so I'm assuming this means her adrenals are ok. Does this mean there's a problem with the pituitary gland? Can anyone advise whether we should request further pituitary testing, and if so, which tests? Next Endo appointment is at the end of May. Many thanks in advance.