<unk>  <unk> , also known as the renin (active) assay or random<unk>  renin, is a measure of the<unk>  of the<unk>  enzyme renin, which plays a major role in the body's regulation of blood pressure, thirst, and urine output. Measure of direct renin concentration (DRC) is technically more demanding, and hence<unk>  is used instead. DRC assays are still in evolution, and generally a conversion factor of<unk>  (ng/mL/h) to DRC (mU/L) is 8.2. A Recently developed and already commonly used automated DRC assay uses the conversion factor is 12.<unk>  is sometimes measured, specially in case of certain diseases which present with hypertension or hypotension.<unk>  is also raised in certain tumors. A<unk>  measurement may be compared to a<unk>  aldosterone concentration as an aldosterone-to-renin ratio (ARR).
Plasma renin activity
Aldosterone-to-renin ratio
Fractional excretion of sodium
Captopril suppression test
Ventricular natriuretic peptide
N-terminal prohormone of brain natriuretic peptide
Urine urea nitrogen
Glomerular filtration rate