Oesophageal (+gastric) pH probe
Oesophageal impedance study
Endoscopy and histology Milk or soya allergy/intoleranceDiarrhoea, rashesSee Chapter 12 GastroenteritisWatery stools, feverStool virology/microbiology ConstipationStraining, hard stool, retentive behaviourSee Chapter 14 Urinary tract infectionFever, pyuriaUrine dipstick test for leukocytes and nitrites, or microscopy
Microbial culture IntussusceptionIll child, red currant jelly stools (late sign)
Blood on digital rectal examinationFluoroscopy with air enema reduction VolvulusDistension, bilious vomitingAbdominal radiograph Incarcerated hernia

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