Healthcare costs for foreigners?

Hello everyone, I will be in Singapore in a week and would like to get into the doctor/hospital. I deal with long covid but I have been really bad as of late so want to get in for bloodwork and other stuff.

I am currently in Bangkok right now and am trying to decide if I should be seen here or wait for Singapore.

When researching online, it's a bit difficult to tell how expensive things will be in Singapore.