Vitamin D test tests measure vitamin D deficiency in blood serum. This test is also relevant if you are taking any vitamin D supplements as it finds out if they are present in an adequate quantity in the blood.
The T4 test measures the quantity of the T4 hormone in the blood. This hormone is also called thyroxine hormone and it is synthesized by the thyroid gland in the body.
PT/INR test (prothrombin time/international normalized ratio measures the time duration of clotting of blood in a blood sample. INR is a calculation performed on the results of the PT test.
T3 free test measures the amount of the T3 thyroid hormone. This test is different from the total T3 test which measures both free and bound T3.
An RA factor test determines the number of rheumatoid factors in the blood. Rheumatoid arthritis (RA) factors are proteins synthesized by the immune system
Testosterone tests are for measuring free as well as attached forms of testosterone hormone. This hormone has two main forms, the free form which is not attached to a protein