Estimated tax is the method used to pay Social Security and Medicare taxes and income tax, because you do not have an employer withholding these taxes for you. Form 1040-ES, Estimated Tax for Individuals (PDF), is used to figure these taxes. Form 1040-ES contains a worksheet that is similar to Form 1040.
Why It's Done. The main reason doctors order the IGFBP-3 test is for its usefulness as an indicator of whether someone is producing a normal amount of human growth hormone. In this way, the IGFBP-3 test is used to check for pituitary gland disorders and abnormalities in growth hormone production.
IHC for hormone receptor testing. Most testing labs use the IHC test to see if there are hormone receptors on breast cancer cells. If hormone receptors are present, this means that the cancer cellsâ growth is fueled by the hormones estrogen and/or progesterone.