This study was conducted to determine whether newborns from different ethnic and socioeconomic groups in Washington State are equally likely to have a routine second newborn screening (NBS) test and if there are identifiable factors associated with not having a second test.

For many years, the standard of care for NBS in Washington has been that newborns should receive a routine second screening test at age 7-10 days.

However, data collected by State Department of Health (DOH) staff for the past several years indicate that only about 80% of newborns receive a routine second NBS test.

The data presented here suggest that identifiable factors (i.e., barriers) exist in accessing a routine second NBS test in Washington.

Increased educational efforts targeting certain high-risk infants, their parents/caretakers, and primary care providers are apparently needed to ensure equal access to a routine second test.