Plasma renin activity (PRA).
To assist in evaluating for a possible cause of hypertension.
Plasma (3 mL) collected in a lavender-top (EDTA) tube.
|Age and Position||Conventional Units||SI Units (Conventional Units × 1)|
|Newborn–12 mo||2–35 ng/mL/hr||2–35 ng/mL/hr|
|Supine, normal sodium diet|
| 1–3 yr||1.7–11.2 ng/mL/hr||1.7–11.2 mcg/L/hr|
| 4–5 yr||1.0–6.5 ng/mL/hr||1.0–6.5 mcg/L/hr|
| 6–10 yr||0.5–5.9 ng/mL/hr||0.5–5.9 mcg/L/hr|
| 11–15 yr||0.5–3.3 ng/mL/hr||0.5–3.3 mcg/L/hr|
| Adult||0.2–2.3 ng/mL/hr||0.2–2.3 mcg/L/hr|
|Upright, normal sodium diet|
| Adult–older adult||1.3–4 ng/mL/hr||1.3–4 mcg/L/hr|
|Values vary according to the laboratory performing the test, as well as the patient’s age, gender, dietary pattern, state of hydration, posture, and physical activity.|