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Alpha-Lactalbumin-to-IgG Mass Ratio, Serum

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

A specialized blood test that compares the amounts of alpha-lactalbumin and immunoglobulin G (IgG) in serum.

Quick summary

["This ratio compares two serum proteins, but an abnormal result must be interpreted with the individual protein measurements and your clinical context."]

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

Key facts at a glance

LOINC
109995-1
Short code
A-Lactalb IgG Msmt Ser
Synonyms
A-Lactalb IgG Msmt Ser
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 this test?

This test measures alpha-lactalbumin and immunoglobulin G (IgG) in serum, the liquid portion of blood. It presents their relative amounts as a mass ratio.

Why might I need this test?

This is a specialized rather than routine test. A clinician may order it when evaluating a suspected protein-related condition or when interpreting results alongside other laboratory and clinical findings.

How is the test performed?

A blood sample is collected by venipuncture. The laboratory separates the serum, measures the relevant protein amounts, and calculates the alpha-lactalbumin-to-IgG ratio.

How do I prepare for the test?

Fasting is usually not required, but follow any instructions from the ordering clinician. Do not stop medications unless your healthcare professional specifically tells you to do so.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Alpha-Lactalbumin/IgG Ratio

Frequently asked questions

Is this a common blood test?
No. It is a specialized test and is usually interpreted by a clinician familiar with the individual alpha-lactalbumin and IgG results.
Does a high or low ratio diagnose a disease?
No. The ratio can be affected by changes in either measured protein and must be considered alongside your overall clinical findings.
Do I need to fast before this test?
Fasting is generally unnecessary unless your clinician has given different instructions. Confirm any preparation requirements with the laboratory or ordering provider.
  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