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Plasma Renin Activity (measured via renin-chymase activity in plasma)

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

This test measures how much active renin your body produces in the plasma. Renin plays a key role in regulating 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
77680-7
Short code
Renin 4h p chal Plas-mCnc
Synonyms
Renin 4h p chal Plas-mCnc
Category
chemistry
Sample
plasma
Container
Lavender-top (EDTA) or Green-top (Heparin)
Units
N/A
Ref low
44
Ref high
147
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84075
SNOMED
27550007
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

What Is Renin Activity Testing Used For?

Doctors may order this test to evaluate kidney function, especially if you have symptoms like high blood pressure, kidney problems, or signs of fluid imbalance. It can also help diagnose conditions like primary aldosteronism or other hormonal imbalances affecting blood pressure.

How Is the Test Performed?

A blood sample is drawn from a vein, usually in your arm. The sample is processed to measure renin-chymase activity, which reflects how much active renin is present in your plasma.

What Does the Test Result Mean?

Results are not provided in absolute numeric ranges, as they depend on clinical context. High or low levels may indicate kidney dysfunction, hormonal disorders, or other health concerns that require medical interpretation.

Common Reasons for Testing

This test is often used when doctors suspect conditions like hypertension (high blood pressure), kidney disease, or hormonal imbalances that affect fluid and electrolyte balance.

Reference range

Adult: 44-147 U/LN/A

Specimen: plasma

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Renin Activity

Frequently asked questions

Why might I need this test?
Your doctor may recommend this test if you have symptoms like unexplained high blood pressure, kidney issues, or signs of fluid retention. It helps assess how well your kidneys are managing blood pressure and hormone regulation.
What are typical reference ranges?
Reference ranges vary by lab and clinical context. Since this is a functional assay (renin-chymase activity), results are interpreted relative to your symptoms and medical history rather than a fixed numeric range.
How soon will I get results?
Results are typically available within 1–3 business days, depending on your lab. Your doctor will discuss them with you during your follow-up visit.
  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