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HelpOrder Code LAB1382 Renin Activity, Plasma
Additional Codes
| Mayo Test ID |
|---|
| PRA |
Reporting Name
Renin Activity, PUseful For
Investigation of primary aldosteronism (eg, adrenal adenoma/carcinoma and adrenal cortical hyperplasia) and secondary aldosteronism (renovascular disease, salt depletion, potassium loading, cardiac failure with ascites, pregnancy, Bartter syndrome)
This test is not useful for determination of plasma renin concentration.
Specimen Type
Plasma EDTASpecimen Required
Patient Preparation: For 4 to 6 weeks before specimen collection, spironolactone (Aldactone) should be discontinued, as plasma renin activity cannot be interpreted if the patient is being treated with spironolactone.
Collection Container/Tube: Chilled, lavender top (EDTA)
Submission Container/Tube: Plastic vial
Specimen Volume: 0.8 mL
Collection Instructions:
1. Draw blood in a chilled syringe from a patient in a seated position; place specimen in a chilled, 3-mL lavender-top (EDTA) tube and mix well. Alternatively, draw blood directly in a chilled, EDTA tube.
2. Immediately place EDTA tube into an ice-water bath until thoroughly cooled.
3. Immediately centrifuge using a refrigerated centrifuge and aliquot plasma into a plastic vial.
Note: If a refrigerated centrifuge is unavailable, chill the centrifuge carriers before use. Centrifuge specimen for 5 minutes or less, then promptly aliquot plasma into a plastic vial.
4. Immediately freeze plasma.
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Plasma EDTA | Frozen | 14 days |
Reject Due To
| Gross hemolysis | Reject |
| Gross lipemia | OK |
| Gross icterus | OK |
Reference Values
0-2 years: 4.6 ng/mL/h (mean)* Range: 1.4-7.8 ng/mL/h
3-5 years: 2.5 ng/mL/h (mean)* Range: 1.5-3.5 ng/mL/h
6-8 years: 1.4 ng/mL/h (mean)* Range: 0.8-2.0 ng/mL/h
9-11 years: 1.9 ng/mL/h (mean)* Range: 0.9-2.9 ng/mL/h
12-17 years: 1.8 ng/mL/h (mean)* Range: 1.2-2.4 ng/mL/h
Mean data not standardized as to time of day or diet. Infants were supine, children sitting.
*Stalker HP, Holland NH, Kotchen JM, Kotchen TA. Plasma renin activity in healthy children. J Pediatr. 1976;89(2):256-258
Na-depleted, upright (peripheral vein specimen)
18-39 years: 10.8 ng/mL/h (mean)
2.9-24.0 ng/mL/h (range)
≥40 years: 5.9 ng/mL/h (mean)
2.9-10.8 ng/mL/h (range)
Na-replete, upright (peripheral vein specimen)
18-39 years: 1.9 ng/mL/h (mean)
≤0.6-4.3 ng/mL/hour (range)
≥40 years: 1.0 ng/mL/h (mean)
≤0.6-3.0 ng/mL/h (range)
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Day(s) Performed
Monday through Friday, Sunday
Method Name
Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)
Portions of this test are covered by patents held by Quest Diagnostics
CPT Code Information
84244
Special Instructions
Method Description
The renin in plasma is allowed to act on the plasma's endogenous substrate, angiotensinogen, producing angiotensin I. This is measured by liquid chromatography tandem mass spectrometry (LC-MS/MS). Renin activity is expressed in ng of angiotensin produced per mL of plasma per hour of incubation.
The primary metabolite of renin activity, angiotensin I, is cleaved by converting enzyme to angiotensin II. By inhibiting the action of converting enzyme and the angiotensinases with EDTA, dimercaprol (BAL) and 8-hydroxyquinoline, it is possible to indirectly measure the activity of renin during a controlled incubation by measuring the concentration (in ng) of angiotensin I that is generated.
Plasma is mixed with generation buffer in two microtiter plates, which are then incubated: one at 0° C and the other at 37° C for 1 hour. During incubation, internal standard (IS) and reagent are added to the 0° C mixture. After incubation, IS and reagent are added to the 37° C mixture. The plates are then centrifuged, and the supernatant layers transferred to clean microtiter plates. The reagents are evaporated under nitrogen, reconstituted, and the angiotensin I analyzed by LC-MS/MS.(Bruton J, Singh RJ, Grebe SK, Ladwig P, Barnidge D. Sensitive and rapid determination of angiotensin I utilizing on-line extraction and LC-MS/MS [Abstract D-64] Clin Chem. 2007;53(Suppl):A180–A181)
Forms
If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:
-General Request (T239)
-Cardiovascular Test Request (T724)