Bloods
FBC (normocytic normochromic anaemia),
CRP/ESR (raised), U+Es (high K+, low Na, high urea)
Bone profile (high Ca)
Hormones - ACTH (high primary, low secondary),
renin/aldo (may be low), 17 hydroxyprogestrogen (cong AH)
Immunology - 21-hydroxylase adrenal auto-Abs (Addisons)
Group and save/crossmatch - suspected haemorrhage