I haven't used it. I am not aware if my hospital offers it or not
Our providers are Cerner and don’t offer it. I have linked up Quest for bloodwork though.
Has done a relatively good job of sourcing records, but not always timely. Do wish there were more tools in Apple Health esp for trending specific lab results that relate to organ health and cancer progression. Overall, good first step by Apple and far easier to use than Google Health and HealthVault