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 laboratory testing is used to diagnose: 1  Peripheral Arterial Disease (PAD): Blockages in the circulation to the arms or legs due to atherosclerosis or other disease which may threaten the limbs.  Cerebrovascular Disease: Blockages in the arteries to the brain that may increase risk of stroke.