265 results found
Medical tests
… or trisomy 18 . First-trimester screening tests include: Blood tests. These measure the level of two substances in the blood called pregnancy-associated plasma protein A (PAPP-A) … gonadotropin hormone (beta-hCG). PAPP-A is a protein in the blood. Beta-hCG is a hormone made by the placenta . In some …
Medical tests
… tissue from the body. A karyotype test usually is done on a blood sample taken from a vein. For testing during … be done on a sample of amniotic fluid or the placenta . Blood sample from a vein A health professional uses a needle to take a blood sample, usually from an arm. Cell sample from a fetus …
Medical tests
… (low pH ) or alkalinity (high pH) of the semen. White blood cell count. White blood cells are not usually present in semen. Why It Is Done … how well they can move or can penetrate an egg. White blood cell count. A high number of white blood cells and …
Medical tests
… tests are done to find certain antibodies that attack red blood cells. Antibodies are proteins made by the immune … cause antibodies to be made. Transfusion reaction Human blood is typed by certain markers (called antigens ) on the surface of red blood cells . If you get a blood transfusion, the transfused …
Medical tests
… ultrasound test uses reflected sound waves to see how blood flows through a blood vessel. It helps doctors assess the blood flow through major arteries and veins, such as those …
Medical tests
… dye and camera ( fluoroscopy ) to take pictures of the blood flow in the blood vessels of the head and neck . An angiogram of the … the veins or the four arteries (four-vessel study) carrying blood to the brain. During an angiogram, a thin, soft tube …
Medical tests
… Test Overview A reticulocyte count is a blood test that measures how fast red blood cells called reticulocytes are made by the bone marrow and released into the blood. Reticulocytes are in the blood for about 2 days …
Medical tests
… test that uses dye and a camera to take pictures of the blood flow in an artery or a vein. An angiogram can be used … such as an ulcer. Or it may be done to look for blocked blood vessels in your lungs. During an angiogram, the doctor will put a thin, flexible tube into a blood vessel in your groin or arm. This tube is called a …
Medical tests
… Test Overview Partial thromboplastin time (PTT) is a blood test that measures the time it takes your blood to clot. A PTT test can be used to check for bleeding problems. Blood clotting factors are needed for blood to clot …
Medical tests
… Test Overview A d-dimer test is a blood test that measures a substance that is released when a blood clot breaks up. Doctors order the d-dimer test, along … with other lab tests and imaging scans, to help check for blood-clotting problems. A d-dimer test can also be used to …
