281 results found
Medical tests
… Overview A folate test measures the amount of folate in the blood. Folate is one of many B vitamins. The body needs … 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 …
Medical tests
… Test Overview A hemoglobin electrophoresis test is a blood test done to check the different types of hemoglobin … 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 …
Medical tests
… A vitamin D test measures the amount of vitamin D in the blood. Your body needs vitamin D to absorb calcium . Calcium … test. Why It Is Done You may need this test if you: Have low levels of calcium or phosphate . Have osteoporosis or low bone density . Had a broken bone after a fall from …
Medical tests
… Test Overview A reticulocyte count is a blood test that measures how fast red blood cells called … reticulocyte counts to rise, to help you adjust to the lower oxygen levels at high altitudes. Why It Is Done A … Wrap an elastic band around your upper arm to stop the flow of blood. This makes the veins below the band larger so …
Medical tests
… motile density. pH. This is a measure of the acidity (low pH ) or alkalinity (high pH) of the semen. White blood cell count. White blood cells are not usually present … analysis are often ready within a day. Volume. A high or low semen volume may cause fertility problems. Liquefaction …
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 done … done to: Find a blood clot that is preventing normal blood flow to part of a lung. Look at the flow of blood or air …
Medical tests
… Risks Results Test Overview A ferritin blood test checks the amount of ferritin in the blood. … ) is present. Check to see if iron treatment to raise or lower the iron level is working. How To Prepare In general, … as the pancreas or heart, can affect how the organ works. Low values Low ferritin levels often mean an iron deficiency …
Medical tests
… the amount of follicle-stimulating hormone (FSH) in a blood sample. FSH is produced by the pituitary gland . In … ovarian function before age 40 (premature ovarian failure). Low egg supply (ovarian reserve). Menopause has occurred. … values in children may mean that puberty is about to start. Low values Low FSH values may mean: A woman is not producing …
Medical tests
… the level of the most important estrogen hormones in a blood or urine sample. It measures estradiol, estriol, and … her menstrual cycle . After menopause , it drops to a very low but constant level. Estriol levels are most often … than one fetus, such as twins or triplets. Early puberty. Low values Low values may be caused by: Problems with …
Medical tests
… is found in the urine. Kidney problems can cause high or low levels of phosphate in the urine. High levels of … not get toilet paper, pubic hair, stool (feces), menstrual blood, or anything else in your urine sample. How It Feels … ( hyperparathyroidism ). Too much vitamin D in the body. Low values Low urine phosphate levels may be caused by: An …
