Do I take my Synthroid the morning of a a blood test? I am on 175mcg and my current Endocrinologist asked me to take it that morning. He did not specify a delay between taking my med and draw. Should there be a delay - 4-5 hours? I suffer from Hypogonadism also due to Pituitary Macro-Adenoma resection 1996 at age 39. Radiation treatments for six weeks for residual tumor were six months after surgery. He asked me not to apply Androgel before test to establish trough level.