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 Function Tests. last authored: Oct 2009, David LaPierre last reviewed: Introduction. Renal function tests - most usually serum creatinine (sCr) and blood urea nitrogen (BUN) - are done to estimate glomerular filtration rate (GFR), normally 180L/day. Cystatin C is a protease which is released into the bloodstream and completely filtered, and may be more reliable but is not as widely used.