265 results found
Medical tests
… is most often used to find a pulmonary embolism . This is a blood clot that prevents normal blood flow in the lung. Two types of lung scans are usually … injected into a vein in your arm. It travels through your blood and into the lungs. Pictures from this scan can show …
Medical tests
… Overview A cardiac perfusion scan measures the amount of blood in your heart muscle at rest and after it has been … attack to see if areas of the heart are not getting enough blood or to find out how much heart muscle has been damaged … ) is given through an IV . The tracer travels through the blood and into the heart muscle. As the tracer moves through …
Medical tests
… the level of adrenocorticotropic hormone (ACTH) in the blood to check for problems with the pituitary gland and … stress. Cortisol is needed for life, so its levels in the blood are closely controlled. When cortisol levels rise, … as ACTH. ACTH is released in bursts, so its levels in the blood can vary from minute to minute. Interpretation of the …
Medical tests
… Test Overview A C-reactive protein (CRP) test is a blood test that measures the amount of a protein called C-reactive protein in your blood. C-reactive protein measures general levels of … lymph nodes). Giant cell arteritis (painful swelling of the blood vessels in the head and neck). Rheumatoid arthritis …
Medical tests
… Results Test Overview A CD4+ count is a blood test to see how well the immune system is working in … virus (HIV) . CD4+ cells are a type of white blood cell. White blood cells are important in fighting infections. CD4+ cells …
Medical tests
… (BNP) test measures the amount of the BNP hormone in your blood. BNP is made by your heart and shows how well your … Normally, only a low amount of BNP is found in your blood. But if your heart has to work harder than usual over … heart failure , the heart releases more BNP, increasing the blood level of BNP. Why It Is Done The BNP test is used to: …
Medical tests
… measures the amount of human growth hormone (GH) in the blood. GH is made by the pituitary gland and is needed for … food for energy ( metabolism ). The amount of GH in the blood changes during the day and is affected by exercise, … this test, unless your doctor tells you to. How It Is Done Blood levels of growth hormone (GH) can change quickly, so …
Medical tests
… measures the amount of prostate-specific antigen in the blood. PSA is released into the blood by the prostate , which is part of the male … system. Healthy people have low amounts of PSA in the blood. The amount of PSA in the blood normally increases as …
Medical tests
… sodium and potassium levels in the body. This helps control blood pressure and the balance of fluids and electrolytes in the blood. The kidney hormone renin normally stimulates the … for a tumour in the adrenal glands. Find the cause of high blood pressure or low potassium levels. This is done when …
Medical tests
… Test Overview Cholesterol and triglyceride tests are blood tests that measure lipids—fats and fatty substances … a source of energy by your body. Lipids are found in your blood and are stored in tissues. They are an important part … drink anything except water for 9 to 14 hours before your blood test. In most cases, you are allowed to take your …
