What are amino acids and why do they matter?
Amino acids are the fundamental building blocks of every protein in the human body. Of the 20 standard amino acids, nine are considered essential — meaning they cannot be synthesised internally and must be obtained from the diet. But amino acids do far more than build muscle. They serve as precursors for neurotransmitters (serotonin, dopamine, GABA), hormones (thyroid hormones, adrenaline), and key metabolic intermediates involved in energy production, detoxification, and immune function.
A comprehensive amino acid profile measures the circulating concentrations of individual amino acids simultaneously, revealing imbalances that would be invisible on a standard blood panel. This makes it one of the most information-dense biomarker tests available.
What can an amino acid blood test reveal?
An amino acid profile can detect protein-energy malnutrition even before clinical symptoms appear, identify specific amino acid deficiencies linked to mood disorders (low tryptophan affecting serotonin synthesis), reveal impaired methylation pathways (through methionine and homocysteine ratios), highlight markers of muscle catabolism or overtraining (branched-chain amino acid depletion), and indicate gastrointestinal malabsorption affecting multiple amino acids simultaneously.
For researchers, the breadth of a 26-analyte panel provides a metabolic fingerprint that can differentiate nutritional phenotypes, monitor intervention efficacy, and identify population-level trends that single-marker tests cannot capture.
Who benefits from amino acid testing?
Athletes and performance-focused individuals use amino acid profiles to optimise recovery and identify rate-limiting nutrients in their training regimens. Clinicians working with patients on restrictive diets — particularly vegan, ketogenic, or elimination diets — rely on amino acid testing to confirm nutritional adequacy. The test is also valuable in clinical settings for patients with chronic fatigue, unexplained neurological symptoms, suspected inborn errors of metabolism, or post-bariatric surgery nutritional monitoring.
How Masdiag measures amino acids
Masdiag quantifies 26 amino acids using LC-MS/MS — liquid chromatography tandem mass spectrometry — from a single dried blood spot. This approach combines the analytical precision of the gold-standard mass spectrometry platform with the practical advantages of fingerprick collection: no venepuncture, no cold-chain logistics, and suitability for at-home or remote sampling. Results are reported with reference ranges validated against the peer-reviewed literature.
Frequently asked questions
What is an amino acid profile blood test?
An amino acid profile is a laboratory test that measures the concentrations of multiple amino acids in the blood simultaneously. It provides a comprehensive view of protein metabolism, nutritional status, and metabolic pathway function — far beyond what a standard protein or albumin test can reveal.
Do I need to fast before an amino acid test?
Fasting for 8–12 hours before sample collection is generally recommended for amino acid testing, as recent food intake can temporarily alter circulating amino acid levels. This ensures results reflect baseline metabolic status rather than acute dietary effects.
Can amino acid testing detect nutritional deficiencies on a vegan diet?
Yes. Amino acid profiles are particularly useful for people on plant-based diets, as they can identify deficiencies in essential amino acids (especially lysine, methionine, and leucine) that are less abundant in plant proteins compared to animal sources.
Explore This Test
View the full method details, sample requirements, and analyte panel for our Amino Acids test.
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