This is related to what your doctor is testing for, which in turn is related to what kind of condition or disease you might have. Many common blood tests, such as ABO/Rh typing and antibody or qPCR tests for particular pathogens, include no such restrictions for the patient.
E: I’d guess you’re being tested for some sort of metabolic disorder, but obviously you’re not required to disclose information like that to strangers on the internet.
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