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Plasma Renin Activity (measured as renin concentration)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of renin in your blood plasma, a hormone that helps regulate blood pressure and fluid balance.

Quick summary

["Renin activity helps assess kidney function and blood pressure regulation."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
58812-9
Short code
Renin sp3 Plas-mCnc
Synonyms
Renin sp3 Plas-mCnc
Category
chemistry
Sample
plasma
Container
Lavender-top (EDTA) or Green-top (Heparin)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your doctor may order this test if you have symptoms like high blood pressure, kidney problems, or conditions affecting your kidneys’ ability to control fluid and salt balance. It can also help diagnose or monitor certain hormonal or kidney-related disorders.

What Does the Test Involve?

A blood sample is taken from a vein in your arm. The sample is sent to a lab where renin levels are measured using an immunoassay method to detect the hormone.

What Does a Result Mean?

Results can indicate whether your kidneys are producing enough renin, which may suggest conditions like primary aldosteronism, renal artery stenosis, or other hormonal imbalances. However, reference ranges vary by lab, so your doctor will interpret results in the context of your health.

Common Conditions Monitored

This test is often used to evaluate conditions such as hypertension (high blood pressure), kidney disease, or disorders involving the renin-angiotensin system, such as certain types of secondary hypertension.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Renin Activity

Frequently asked questions

What causes my renin activity test to be ordered?
Your doctor may order this test if you have symptoms like unexplained high blood pressure, kidney issues, or if they suspect a hormonal imbalance affecting your kidneys or blood pressure.
How long does it take to get my results?
Results typically take 1 to 3 business days, depending on your lab’s processing time. Your doctor will contact you once they are ready for review.
Can I eat or drink anything before this test?
No special preparation is usually needed, but follow your doctor’s instructions if they specify any restrictions, such as fasting or avoiding certain medications.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy