📖 Source: Kemper AR, Mahle WT, Martin GR, et al. Strategies for implementing screening for critical congenital heart disease. Pediatrics. 2011;128(5):e1259-e1267. | Newborn CCHD screening · right hand and one foot · any SpO2 <90% positive; 90–94% or >3% difference requires repeat; both ≥95% with ≤3% difference negative