📖 Source: Kemper AR, Mahle WT, Martin GR, et al. Strategies for implementing screening for critical congenital heart disease. Pediatrics. 2011;128(5):e1259-e1267. | Murmur characteristics plus pre/post-ductal SpO2 · pathological murmur (grade 3+ or harsher, radiating, with thrill) warrants echocardiography · positive screen is not a diagnosis