The ASQ is a flexible system and it allows programs to choose the frequency of screening based on what works best with your program's goals and capabilities. We do recommend that programs screen on a regular basis, rather than just once, to detect delays that may develop as the children develop.
For children birth to 24 months, screening with ASQ-3 every 4–6 months is adequate. If a delay is suspected, programs should rescreen in 2–3 months. For children 2–3 years, every 6 months is adequate unless a delay is suspected.