A qualitative drug screen is used to detect the presence of a drug in the body. A blood or urine sample may be used. However, urine is the best specimen for broad qualitative screening, as blood is relatively insensitive for many common drugs, including psychotropic agents, opioids, and stimulants. Common methods of drug analysis include chromatography, immunoassay, chemical (spot) tests, and spectrometry.
Polycythemia Vera Complications. If you have PV, the thickness of your blood and the slowed blood flow can cause serious health problems. Blood clots are the most serious complication of PV. Blood clots can cause a heart attack or stroke. They also can cause your liver and spleen to enlarge.
For instance, we see that the prefix 'poly' means many, the word 'cyt' refers to cells and the suffix 'emia' refers to in the blood. So polycythemia is literally 'many cells in the blood.' Types: Polycythemia Vera. There are two types of polycythemia. The first is called polycythemia vera, which is also known as primary polycythemia. Polycythemia vera is caused by a problem with the bone marrow, resulting in an overproduction of cells. The bone marrow is the 'primary' site for red blood cell production, which might help you recall this term's alternate name.