271 results found
Medical tests
… made longer by: Blood-thinning medicine, such as warfarin. Low levels of blood clotting factors. A change in the … to make sure you are taking the right dose. Check for low levels of blood clotting factors. The lack of some … values A longer-than-normal PT can mean a lack of or low level of one or more blood clotting factors (factors I, …
Medical tests
… viral load. This means that the amount of the virus is too low for the test to detect. When the virus is undetectable, … blood. It means that the amount of HIV in the blood was too low for the test to detect. CD4+ Cells … viral load. This means that the amount of the virus is too low for the test to detect. When the virus is undetectable, …
Medical tests
… A PET scan is often used to evaluate cancer, check blood flow, or see how organs are working. Why It Is Done Positron … tomography (PET) scan is done to: Study the brain's blood flow and metabolic activity. A PET scan can help a doctor … Emission Tomography (PET)—HowItFeels You will not feel pain during the test. The table you lie on may be hard and …
Medical tests
… test. How It Is Done You will be asked to tilt your head back and open your mouth as wide as possible. Your doctor … and throat. A clean cotton swab will be rubbed over the back of your throat, around your tonsils, and over any red … test. How It Is Done You will be asked to tilt your head back and open your mouth as wide as possible. Your doctor …
Medical tests
… you have a fetal ultrasound . For the tests, you will lie back on a padded examination table. If you become short of breath or light-headed while lying on your back, say so. The technician can help you change your … take about 30 to 60 minutes. How It Feels Lying on your back (or side) during the test may be uncomfortable. During …
Medical tests
… uses ultrasound to measure the thickness of the skin at the back of your baby's neck. An increase in the thickness can … means that you have a negative result and your baby has a lower chance of a birth defect. But it doesn't guarantee … means that you have a negative result and your baby has a lower chance of a birth defect. But it doesn't guarantee …
Medical tests
… can be collected by having you spit into a tube. It isn't painful. A cheek swab collects cells from the inside lining … days. Risks Risks from gathering a sample There is a very low risk of problems from taking samples of blood, saliva, … days. Risks Risks from gathering a sample There is a very low risk of problems from taking samples of blood, saliva, …
Medical tests
… sample to show changes in the body, because hair grows slowly. Hair samples do not show recent changes in the body, … taken from a specific part of the body, such as from the back of the scalp by the neck or from the pubic area. Hair … months before the test. How It Feels There is generally no pain or discomfort associated with this test. But if you …
Medical tests
… monitoring is done remotely. This is called telemetry. It allows you to be checked without being hooked up to a machine. … is usually at a nurse's station. Using a remote monitor allows you to walk around freely. Internal monitoring Internal … monitoring For external monitoring, you may lie on your back or left side. Two belts with sensors attached will be …
Medical tests
… studied. One part of the scanning machine can tilt to follow the curve of your spine. All of the pictures are saved … on the CT pictures. The dye may be used to check for blood flow and look for tumours , areas of inflammation , or nerve … takes a few minutes. How It Feels The test will not cause pain, but some people feel nervous inside the CT scanner. If …
