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Serum or plasma mass concentration of lysine

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

This test measures the amount of lysine, an essential amino acid found in your blood. Lysine helps with protein synthesis, immune function, and calcium absorption.

Quick summary

["Lysine levels can help diagnose or monitor conditions affecting protein metabolism or amino acid disorders."]

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

Key facts at a glance

LOINC
13373-6
Short code
OH-Lysine CSF-mCnc
Synonyms
OH-Lysine CSF-mCnc
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test if you have symptoms like muscle weakness, skin rashes, or unusual fatigue that could be linked to amino acid imbalances. It may also be part of a broader evaluation for metabolic disorders or nutritional deficiencies.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours if your blood is drawn early in the morning. Wear a comfortable shirt with an easy neckline for easy access.

During the Test

A healthcare professional will insert a small needle into a vein in your arm to draw blood. You may feel a slight sting, but the procedure usually takes just a few minutes. You can sit or lie down while the blood is collected.

After the Test

After the needle is removed, apply gentle pressure to the site to stop any bleeding. You can resume normal activities immediately. If you experience excessive bruising or pain, contact your provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lysine level

Frequently asked questions

How is lysine measured?
Lysine levels are measured using a specialized laboratory technique, likely high-performance liquid chromatography (HPLC) or a similar method to separate and quantify the amino acid in your blood sample.
What are typical reference ranges?
Reference ranges for lysine levels can vary by lab and may not be widely publicized. Your results will be compared to your lab’s specific standards, and your provider will explain what they mean for your health.
Can lifestyle changes affect lysine levels?
Yes, diet plays a role. Foods high in lysine, such as meat, dairy, legumes, and some vegetables, can influence your levels. Avoiding excessive alcohol or certain medications may also help maintain balanced amino acid levels.
  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