CBC
NG lavage
Consider for suspectedsig. GI blood loss
Small child: 12F NG tube; instill 50cc saline
Older child: 14-16F NG tube; instill 100-200cc saline
Aspirate after 2-3min
Consider for suspectedsig. GI blood loss
Small child: 12F NG tube; instill 50cc saline
Older child: 14-16F NG tube; instill 100-200cc saline
Aspirate after 2-3min
Gastrointestinal bleeding 
<2mo
Lower gastrointestinal bleeding
Swallowed maternal blood 
Burns
Stress ulcer
Dark raised skin lesions
Vascular malformation