Test Overview
A renin assay blood test is done to find the
cause of
. Renin is an
made by special cells in the
. Renin works with aldosterone (a
made by the
) and several other substances to help
balance sodium and
levels in the blood and fluid levels in the
body, which affects your blood pressure.
A renin test is often
done at the same time as an aldosterone test. In some people, it may be normal
to have high blood levels of both renin and aldosterone. If renin levels are
low and aldosterone levels are high, a tumor may be present in the
.