Children in the well-baby nursery are screened at 24 hours of life or later, or shortly before discharge if discharged earlier than 24 hours of life. An oxygen saturation measure less than 90% in the right hand or foot is considered a positive screen (in the initial screen or in repeat screens). An oxygen saturation measure of 95% or greater in the right hand or foot  with 3% or less absolute difference in oxygen saturation between the right hand and foot is considered a negative screen (in the initial screen or in repeat screens), and screening ends. If the oxygen saturation is 90% or above but less than 95% in the right hand and foot or the absolute difference in oxygen saturation between the right hand and foot is greater than 3%, the screen is repeated in an hour. If the results are in the same range, the screen is again repeated in an hour. A third measure of oxygen saturation 90% or above but less than 95% in the right hand and foot or absolute difference in oxygen saturation between the right hand and foot greater than 3% is then considered a positive screen.