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.
The health care provider may order one or more of these tests: 1  Urinalysis to check for urinary tract infection or kidney disease. 2  Blood test to check for kidney disease. 3  Kidney imaging studies to check for a tumor, kidney or bladder stone, enlarged prostate, or blockage to urine flow.