| Implantable Cardioverter Defibrillator (ICD) Insertion During this procedure, an electronic device is inserted into the chest to help regulate electrical problems with the heart by providing either anti-tachycardia pacing (ATP) or shock therapy to prevent sudden cardiac arrest. |
| Intravenous Pyelogram An intravenous pyelogram is a procedure that uses a combination of contrast dyes and X-rays to look for obstructions in the blood flow of the kidneys or poor kidney function. |
| Immunohistochemical Test for Estrogen and Progesterone Receptors This test looks for several types of receptors on cells in a sample of breast cancer tissue. It helps your doctor figure out which type of breast cancer you have. |
| Immunofixation (Blood) This blood test finds out if you are abnormally making or losing protein or whether you are having problems absorbing protein. |
| Immunofixation by Electrophoresis (Urine) This test separates and measures proteins in your urine. It looks for an abnormal protein called monoclonal protein, or M-protein. |
| Immunofixation and Protein Electrophoresis (CSF) This test looks for certain proteins in a sample of your cerebral spinal fluid. Having these proteins may be a sign of multiple sclerosis or other central nervous system disorder. |
| Insulin-Like Growth Factor This test measures the amount of insulin-like growth factor-1 (IGF-1) in your blood. |
| International Normalized Ratio This blood test looks to see how well your blood clots. The test is especially important if you take blood-thinning medications. |
| Intrinsic Factor Antibody This is a blood test for pernicious anemia, which is caused by a deficiency of vitamin B12. |
| Iron (Blood) This test measures the level of iron in your blood. Having too little or too much iron can lead to health problems. |