In nature, methane is produced by the anaerobic bacterial decomposition of vegetable matter under water (where it is sometimes called marsh gas or swamp gas). Wetlands are the major natural source of methane produced in this way.
What are the exams and tests for renal artery stenosis? Blood tests. Screening blood tests may be done as part of the general evaluation of high blood pressure and may include a complete blood count, electrolytes, kidney function tests, and a urinalysis. Imaging. Renal artery narrowing can be detected with ultrasound or computerized tomography angiography or arteriography.
Vascular conditions affecting the renal arteries and veins include the following: 1  Renal artery stenosis â Renal artery stenosis is a blockage of an artery to the kidneys. 2  Renal artery thrombosis â Renal artery thrombosis is the formation of a clot in a renal artery.