Pediatric obstructive sleep apnea (OSA) is associated with heavy snoring and brief pauses in breathing during sleep. It affects at least 1-3% of the general pediatric population with greater prevalence among certain high risk groups such as children with obesity, Down syndrome, craniofacial anomalies, or neuromuscular disorders. Several studies have shown that, even after having adenotonsillectomy (AT), approximately 30% of children continue to struggle with OSA. They further found that older children (age > 7 yrs), obesity, and high pre-operative OSA severity were all risk factors contributing to residual OSA. Despite these known risk factors, the ability to predict each individual patient's risk of residual OSA after tonsil surgery is difficult. Determining what tool will best predict residual OSA is an important step towards more effective post-surgery OSA management.