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Alpha-Lactalbumin — Qualitative Test (Deprecated)

Published: August 9, 2026Updated: August 17, 2026

A qualitative test that checks whether the protein alpha-lactalbumin is present in a submitted sample.

Quick summary

["The result reports whether alpha-lactalbumin was detected, but its meaning depends on the specimen and clinical context."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
21358-7
Short code
Deprecated A-Lactalb IgG RAST Ql
Synonyms
Deprecated A-Lactalb IgG RAST Ql
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
10
Ref high
40
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84484
SNOMED
302774002
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 qualitative test checks for alpha-lactalbumin, a protein associated with milk. A qualitative result reports presence or absence rather than a measured concentration.

Why might I need this test?

A clinician may order this test when they need to know whether alpha-lactalbumin is present in a particular sample. The reason for testing and the sample type determine how the result should be interpreted.

How is the test performed?

A laboratory method is used to detect alpha-lactalbumin in the submitted specimen. If the test is detected, the result is generally reported as positive; if it is not found above the laboratory's detection limits, it is reported as negative.

How do I prepare for the test?

Preparation depends on the specimen required. Follow the ordering clinician or laboratory's collection instructions carefully, and ask the laboratory if you are unsure how or when to provide the sample.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Alpha-Lactalbumin (Qualitative)

Frequently asked questions

What does a positive result mean?
It means alpha-lactalbumin was detected in the sample. The significance can vary substantially depending on the type of sample and the clinical situation.
Does this test provide a numeric concentration?
No. It is a qualitative test, so it reports presence or absence rather than a measured amount of alpha-lactalbumin.
Why is the test listed as deprecated?
Deprecated means it is an older test that may no longer be routinely offered or may have been replaced by a newer assay. If this name appears on your report, ask the laboratory whether a current test is recommended.
  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 17, 2026. · Read our editorial policy