Verify a nasogastric tube before a feed — OSCE

A four-year-old boy recovering from a viral illness is on the ward with a nasogastric tube for short-term refeeding. The aspirate reads pH 6 on the indicator strip. The bedside nurse, who trained some years ago, asks whether she can save time by using the whoosh test to confirm the tube, and whether the feed can go down now. You have eight minutes to verify the tube at the bedside using the correct method, decide and defend whether to feed, document the verification, and explain the plan and the safety reason to the nurse and to the child's parent in plain language.