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.
The main potential complication of CAD is a stroke. A stroke occurs when the blood flow to the brain is interrupted. This can lead to loss of brain function or even death. There are several ways that CAD can cause a stroke: 1  narrowed carotid arteries may not supply enough blood to the brain.2  a piece of plaque can break off and lodge in one of the smaller arteries of the brain, blocking blood flow. 3  blood clots can form in the carotid artery, blocking blood flow.he main potential complication of CAD is a stroke. A stroke occurs when the blood flow to the brain is interrupted. This can lead to loss of brain function or even death. There are several ways that CAD can cause a stroke: 1  narrowed carotid arteries may not supply enough blood to the brain.