@anamur-- You will need to give separate samples for each test that is required.
Both blood sugar testing and thyroid function testing are considered endocrine tests and blood serum is used for both. However, since the serum is being checked for different substances, there needs to be separate samples that can be centrifuged.
A centrifuge is the equipment that is used to separate blood plasma from the serum. The blood sample is put inside and it rotates super fast causing these two components of blood to separate. Then they check the anti-coagulated blood serum for different substances, like glucose or hormones.