hyperoxia test
Pronunciation: hi-per-OX-ee-ah
A diagnostic test used to differentiate between cyanotic congenital heart disease and pulmonary causes of hypoxemia in newborns.
Full Definition
The hyperoxia test is a clinical diagnostic procedure performed in neonates presenting with cyanosis or hypoxemia to distinguish between cardiac and pulmonary etiologies. The test involves administering 100% oxygen for 10-15 minutes and measuring arterial blood gas or pulse oximetry response. A rise in partial pressure of oxygen (PaO2) above 150 mmHg or oxygen saturation above 95% suggests a pulmonary cause, while minimal improvement indicates likely cyanotic congenital heart disease. This test is crucial in the NICU setting for determining appropriate immediate management and the need for cardiology consultation or emergency interventions.
Usage
Usage note: Often abbreviated as 'hyperoxia test' or '100% O2 test' in clinical documentation. Results should specify both PaO2 values and percentage oxygen saturation for complete assessment.
In Context
- "The hyperoxia test revealed minimal improvement in oxygen saturation, prompting immediate cardiology consultation for suspected congenital heart disease." — NICU admission note
- "Following a positive hyperoxia test with PaO2 rising to 180 mmHg, the focus shifted to treating the underlying respiratory pathology." — Clinical progress note