The Saturation Gap as a Diagnostic Clue for Methemoglobinemia in a Child with Persistent Low Oxygen Saturation
This case report highlights the importance of considering methemoglobinemia in children with persistent low pulse oximetry readings despite normal clinical status and cardiopulmonary workups, emphasizing that the discrepancy between low saturation and preserved arterial oxygen tension serves as a critical diagnostic clue to avoid unnecessary investigations.