Arginine

An amino acid that fuels nitric-oxide production and circulation.

Last reviewedJune 16, 2026

Plasma

sample type

~5 mL

blood needed

~7 days

results in app

Morning, fasting

best timing

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Why test Reference ranges What you'll learn What affects it How testing works Sources FAQ

In short

Arginine is an amino acid the body usually makes for itself, but extra may be needed during growth, illness, or stress. It is the direct precursor of nitric oxide, a molecule that helps blood vessels relax, and it takes part in the urea cycle that clears ammonia.

Comprehensive Health Check

Reviewed against DGKL reference practice.

Why test this?

It is measured as part of a plasma amino acid profile. Levels give insight into protein metabolism and the urea cycle. Unusual readings can point to inherited urea cycle disorders and are interpreted alongside the rest of the panel.

What is a normal result?

Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.

Group	Adult fasting plasma range
Adults	35 to 125 µmol/L

Amino acid ranges vary by laboratory and method. They are best read as part of the full plasma amino acid profile, not in isolation.

Ranges are guidance and vary by lab and assay, aligned with DGKL practice. Always read your result against your own lab's reference interval.

What insights will this test give you?

Insight into protein metabolism and the urea cycle.
Context for nitric oxide and blood vessel function pathways.
A possible signal of urea cycle patterns if clearly abnormal.

What can affect this result?

What can skew the result

Recent protein intake, arginine supplements, fasting state, and time of day affect the result. A fasting morning sample gives the most reliable reading.

Best interpreted with

Read as part of the full plasma amino acid profile.

How is this tested?

Sample

Plasma

Blood needed

~5 mL

Method

Ion-exchange chromatography or LC-MS/MS

Best timing

Morning, fasting

Sources. The evidence behind this

Mayo Clinic Laboratories: Amino Acids, Quantitative, Plasma
MedlinePlus: Plasma amino acids

Common questions

Which Aniva panels include this marker?

Amino Acids

These tests assess essential, non-essential, and branched-chain amino acids, plus related metabolites and functional ratios.