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.
What is a GAD antibodies test? A GAD test is a blood test which measures whether the body is producing a type of antibody which destroys its own GAD cells. In type 1 diabetes, a number of autoantibodies are thought to circulate including those which target glutamic acid decarboxylase. Presence of these autoantibodies suggests type 1 diabetes.