Bloods
ABG (if respiratory distress)
FBC (low Hb if blood loss, high WCC if infection),
CRP (high if infection/inflammation),
U+E (dehydration), LFTs (baseline), coagulation,
group and save, crossmatch
Troponins (MI), D-dimer (PE), amylase (pancreatitis)
Cultures (if suspected infection)