What initial investigations should I perform to confirm a diagnosis of pyloric stenosis in a suspected case?

For a suspected case of pyloric stenosis, the initial investigation involves arranging an urgent specialist hospital assessment ¹,³. This assessment should take place on the same day for infants younger than 2 months who present with progressively worsening or forceful (projectile) vomiting of feeds ¹,³. This urgent referral is crucial to assess for and confirm the possible diagnosis of hypertrophic pyloric stenosis ¹,³.