Is it possible to have thyroid issues not show on bloodwk?my mom had thyroid, and if i take kelp it helps me a lot and i lose weight and feel better

OfCourse NotStandand: Checking TSH (thyroid stimulating hormone), from the hypothalamus, like thousands of other possible tests from a blood sample, is not a "standard" blood test. At any one time, typically only a few things are tested due to costs ; whatever the person marking what tests are requested is choosing to look for versus not look for. Thyroid hormone does not have benefit for people who are not hypothyroid.