I am doing a longitudinal study on V2 and am concerned about the change to V3. What can you tell me about that?

For studies that are in the preconception stage, we would recommend switching to NIH Toolbox V3. For more information about V3, please visit NIHToolbox.org.

For those who are looking to change, many NIH Toolbox V3 tests exhibit high correlations with the previous NIH Toolbox V2 counterpart. Changes can be found here.