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.
Renal Artery Stenosis. Renal artery stenosis (RAS) is the narrowing of one or both arteries that carry blood to the two kidneys. âRenalâ means âkidneyâ and âstenosisâ means ânarrowing.â RAS can cause high blood pressure and reduce kidney function.RAS is often overlooked as a cause of high blood pressure.he arteries that carry blood to the kidneysâcalled the renal arteriesâbranch off directly from the abdominal aorta, the main vessel from the heart that supplies blood to most of the bodyâs organs. Healthy kidneys filter out wastes and extra fluid from the blood that passes through them.