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.
Vein disease is diagnosed through a physical examination and a venous ultrasound test. The ultrasound test will determine if there are any blood clots in the deep, superficial and perforator veins. Registered Vascular Technologists (RVTs) then use the ultrasound to evaluate the blood flow within the vein.