Conditions for drawing and processing blood
Blood is drawn into an EDTA, lavender top Vacutainer from a quietly seated patient under the usual doctor’s office or clinic conditions. Blood is centrifuged at ambient temperature. Then, the plasma is separated, frozen and sent to the laboratory.
Defining low, medium and high PRA levels:
30% of hypertensive patients have low PRA, 60% have medium PRA, about 10% have high PRA.