That is too long to wait
.If lab error, a repeat right away would be in order. If it really is that high, you should have it repeated 3-4 weeks and the dose adjusted.
Are you taking the med in the same fashion as always, everyday?
How do you feel?
Is the prednisone a new addition?
Can you go to an ER or a clinic? Some clinics can do it for you that day.