Depends on the blood test. Stop biotin supplementation before any hormonal immunoassay, don't eat for 8 hours before fasted tests, don't have stimulants before cortisol test.
Depends on the blood test. Stop biotin supplementation before any hormonal immunoassay, don't eat for 8 hours before fasted tests, don't have stimulants before cortisol test.
Depends on the blood test. Stop biotin supplementation before any hormonal immunoassay, don't eat for 8 hours before fasted tests, don't have stimulants before cortisol test.