Pre/Post-Ductal Analyzer
Compare preductal and postductal SpO₂ / PaO₂ values to detect ductal shunting, screen for CCHD, and frame PPHN physiology with oxygenation index support.
Analyzer Inputs
Example values loaded — replace with real patient data.
Preductal > postductal gradient
Pattern suggests right-to-left ductal shunting (PPHN physiology until proven otherwise).
- • Preductal saturation exceeds postductal saturation, suggesting blood desaturates after ductal mixing.
- • PaO₂ gradient is consistent with mild to moderate ductal shunting.
- • Evaluate for PPHN, pulmonary hypertension physiology, or significant parenchymal lung disease.
- • CCHD screen failed — urgent provider evaluation and confirmatory workup indicated.
Related PulmTools
Keep the neonatal oxygenation workflow moving
Pair pre/post-ductal interpretation with cord gases, capillary gases, oxygenation index, and neonatal respiratory references.
Cord Gas Analyzer
Interpret umbilical arterial and venous cord gases with fetal acid-base classification and sampling reliability warnings.
Open →CBG Analyzer
Interpret neonatal and pediatric capillary blood gases with perfusion-aware confidence scoring and SpO₂ guardrails.
Open →P/F Ratio & Oxygenation Index
Assess oxygenation severity using P/F ratio and oxygenation index when PaO₂, FiO₂, and MAP are available.
Open →Neo/Peds Oxygenation Reference
Review neonatal and pediatric oxygenation targets, SpO₂ ranges, FiO₂ escalation, and monitoring guidance.
Open →Neo/Peds HFNC / CPAP Reference
Review noninvasive neonatal and pediatric respiratory support, HFNC, CPAP, NIPPV, and escalation thresholds.
Open →Neo/Peds Ventilation Reference
Review neonatal and pediatric ventilator modes, tidal volume targets, PEEP, rates, and lung-protective support.
Open →- • Preductal = right hand / wrist. Do not use the left hand.
- • Postductal = foot or lower extremity.
- • Pre > post suggests ductal shunting / PPHN physiology. Review the Neo/Peds Oxygenation Reference for target ranges and escalation context.
- • Post > pre (reverse differential) is abnormal and should prompt urgent cardiac evaluation.
- • Small differences in the first 10–15 minutes of life may be transitional and physiologic. Pair this with the Cord Gas Analyzer and CBG Analyzer when acid-base status is part of the question.