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.
Tests Used to Diagnose Kidney Disease. Several types of tests are used to diagnose and evaluate different types of kidney disease: 1  Kidney function is determined using blood and urine tests.  Imaging tests are a relatively painless and low-risk way of providing useful information about kidney structure.