Thank you for the response. He currently does not have or need a hematologist per his primary doctors suggestion. He is a healthy child overall. He has had all of his vaccinations from birth til now, with no issues. But I am still concerned because his O2 saturation levels are in the 70% level and that is his normal. Yet actual Covid 19 has an impact on O2 saturation levels. So that leads me to wonder how his body would react to the vaccine.