271 results found
Medical tests
… aldosterone level will be high while a renin level will be low. Usually a renin activity test is done when the … adrenal glands. Find the cause of high blood pressure or low blood potassium levels. This is done when overactive … before having routine blood tests. If you are having follow-up aldosterone blood tests, your doctor may give you the …
Medical tests
… transducer sends sound waves that echo off your heart and back to the transducer. These echoes are turned into moving … Check for coronary artery disease, which can reduce blood flow to the heart muscle during stress. Look at the heart … 30 to 60 minutes. How It Feels You may have a brief, sharp pain when the intravenous (IV) needle is placed in a vein in …
Medical tests
… of bilirubin in a blood sample. Bilirubin is a brownish yellow substance found in bile . It is produced when the liver … are high, the skin and whites of the eyes may look yellow (jaundice). Jaundice may be caused by liver disease ( … How It Feels Blood sample from a heel stick A brief pain, like a sting or a pinch, is usually felt when the …
Medical tests
… levels of both renin and aldosterone. If renin levels are low and aldosterone levels are high, a tumour may be present … especially when potassium levels in the blood are low. How To Prepare For 2 to 4 weeks before the test, you … For 3 days before a renin test, you may be asked to follow a special low-sodium diet. You may be asked to not eat …
Medical tests
… of skin or lips (labia) apart. Wipe the area from front to back. If you have a penis, use the wipes to clean the tip. … your skin away from the urine stream. After the urine has flowed for several seconds, place the collection container in … hands. How It Feels This test usually doesn't cause any pain or discomfort. Risks There are no known risks from …
Medical tests
… check for: The cause of arm or leg numbness, weakness, or pain. Narrowing of the spinal canal (spinal stenosis). A … increase the amount of water you drink before the test. Follow the instructions your doctor gives you about eating and … on an X-ray table. The doctor cleans an area on your lower back. A numbing medicine is put into your skin. After the …
Medical tests
… including laxatives, aspirin, mouthwash, and toothpaste. Low sodium levels have many causes, such as heart failure, … minerals in the body. Find the cause of symptoms from low or high levels of sodium. Check on the progress of … levels of the hormone aldosterone (hyperaldosteronism). Low levels Low sodium levels (hyponatremia) can be caused by …
Medical tests
… is an examination that lets your doctor look at the back of your throat, your voice box (larynx) , and vocal … weak voice, or no voice. Find the cause of throat and ear pain. Find the cause for trouble swallowing, a feeling of a lump in the throat, or mucus with …
Medical tests
… forms of thalassemia , may cause hemoglobin A levels to be low and hemoglobin F levels to be high. Hemoglobin F (fetal … in the normal range may still be normal for you. High and low values Higher-than-normal amounts of both hemoglobin A2 … F may mean a mild form of thalassemia is present. A very low level of hemoglobin A and a high level of hemoglobin F …
Medical tests
… B12 to use folate. So if vitamin B12 levels are very low, folate can't be used by the cells, and high levels of … is not a reliable way to test for a vitamin B12 deficiency. Low values Low folate levels can also mean that you have a problem …
