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Lactose in Breast Milk (Qualitative)

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

This test checks whether your breast milk contains enough lactose, the natural sugar that nourishes your baby.

Quick summary

["Lactose levels in breast milk help ensure proper nutrition for your infant."]

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

Key facts at a glance

LOINC
23252-0
Short code
M agalactiae DNA Spec Ql NAA+probe
Synonyms
M agalactiae DNA Spec Ql NAA+probe
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
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

Why This Test Is Done

Your healthcare provider may recommend this test if you’re experiencing unexplained symptoms like low milk supply, baby’s poor weight gain, or if lactose intolerance has been suspected in your baby. It can also be part of a broader evaluation for milk composition issues.

What to Expect Before the Test

No special preparation is needed. You’ll provide a sample of your breast milk (collected via manual expression or pump) for analysis. The test is typically done in a clinical lab and may take a few hours to process.

How the Test Works

The test uses a probe to detect lactose presence through a qualitative immunoassay method, which identifies the substance’s presence rather than measuring exact amounts.

Possible Results and Their Meaning

A positive result (detectable lactose) suggests your milk contains sufficient lactose for your baby’s needs. A negative result may indicate low lactose levels, prompting further evaluation of milk production or infant feeding adjustments.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Low lactose in breast milk can affect infant growth and digestion. If confirmed, your provider may recommend dietary adjustments (e.g., lactose-rich foods), medical support, or alternative feeding strategies to optimize your baby’s nutrition.

Short name

Breast Milk Lactose Test (Qual)

Frequently asked questions

What does a negative lactose test mean?
A negative result means lactose was not detected in your breast milk sample, which could indicate insufficient production or a need for further evaluation by your healthcare provider.
Can I take anything to prepare for this test?
No special preparation is required. However, ensure you’re well-hydrated and have enough breast milk available for the sample.
Will my baby need any special care if lactose levels are low?
If lactose levels are low, your provider may suggest adjusting your diet, consulting a lactation specialist, or exploring alternative feeding methods to support your baby’s nutrition.
  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