Hello and welcome to HealingWell and please know he is only doing blood tests. Many people never hear anything said past the word cancer when they are in the Doctors office.
It feels ot me like you are experiencing a little health anxiety as the Doc is running a blood test for cancer. I actually just had one done that I requested for Cancer to make sure I did not have one particular cancer.
Try to avoid the unproductive worry. Unproductive worry is thinking about things you cannot control.
Take a break. Don't saturate yourself with stressful information. Try not to google this test and read everything on the net................Challenge your negative thinking with positive statements and realistic thinking.
Remember we are here for you so know we care.
Again a warm welcome.