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.
Jordanna Joaquina, MS, CGC. Most cases of polycythemia vera appeared to be caused by sporadic, somatic mutations as opposed to inherited mutations. Most cells in our body divide to make new cells. The DNA in those cells needs to be replicated for each new cell. Sporadic DNA changes can occur during cell division or DNA replication as well as with environment damage. Cancer is a multifactorial condition, which means that it involves a combination of genetic and non-genetic factors. Some types of cancer have a stronger genetic component than others.