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That seems backwards, I would think a blood test would give a better indication that someone is using synthetic testosterone and a urine test would give less information. I'm not questioning you it just seems the opposite of what you would expect. The way you explained it makes it sound like it's easier to cheat on a blood test than on a urine test.
No, that's not what I said. The urine test means all they're looking at is the T:E ratio, which would be skewed in Vitor's case because he was undergoing TRT (i.e., we know he was putting synthetic test into his system). This is why they do blood tests for fighters with a TUE, because the T:E ratio is irrelevant since they know they're injecting test. Instead, with the blood test they look at the actual level of testosterone.
So, a urine test could (and very likely would) lead to a failed T:E ratio even if a blood test at that same time might show that his actual T levels are "normal."
Again, the urine test doesn't show that he's got synthetic test in his system, it simply shows that the T:E ratio is skewed, which is more often than not evidence that something fishy (i.e., synthetic test injections) is going on.