A rheumatoid factor test measures the amount of rheumatoid factor in your blood. Rheumatoid factors are proteins produced by your immune system that can attack healthy tissue in your body.
CLOTTED BLOOD OR SERUM
5 TO 6 DAYS
A thyroglobulin antibodies (TgAb) test is used to check blood levels of antibodies the body has made against the compound thyroglobulin.
A vitamin B-12 level test checks the amount of vitamin B-12 in the blood or urine to gauge the body’s overall vitamin B-12 stores. Vitamin B-12 is necessary for several bodily processes, including nerve function and the production of DNA and red blood cells.
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