The process ofageing is to a large extent due to the damagingconsequence of free radical action (lipid peroxidation,DNA damage, protein oxidation) (Harman, 1956).Convincing evidence for the association ofoxidative/ nitrosative stress and acute and chronicdiseases lies on validated biomarkers of oxidativestress.
The radioactive iodine uptake test, or RAIU test, is a type of scan used in the diagnosis of thyroid problems, particularly hyperthyroidism.he normal uptake is between 15 and 25 percent, but this may be forced down if, in the meantime, the patient has eaten foods high in iodine, such as dairy products and seafood. Low uptake suggests thyroiditis, high uptake suggests Graves' disease, and unevenness in uptake suggests the presence of a nodule.
TSH is more sensitive than other thyroid tests because it begins to rise before thyroid hormones drop. As such, itâs a better indicator of early thyroid dysfunction. When the TSH test is âhigh normal,â in the range of 2.5-4.5, deciding to take thyroid medication can be a difficult decision.he first thing that indicates low thyroid is an elevated TSH level. A change from a low normal TSH to a high normal TSH over a period of a few months may mean early thyroid failure. If thyroid antibodies are positive or if the thyroid gland is enlarged the risk for thyroid failure is extremely high.