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Bacteriamothermilk

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

This test checks for the presence of bacteria in breast milk, which can help identify infections that may affect breastfeeding.

Quick summary

{"This test detects bacteria in breast milk samples","It helps diagnose breast infections like mastitis","Results can guide appropriate treatment with antibiotics","Proper milk collection is important for accurate results","Most breast milk contains some bacteria, but harmful levels need treatment"}

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

Key facts at a glance

LOINC
20695-3
Short code
Bacteria # Mother Milk
Synonyms
Bacteria # Mother Milk
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
3.5
Ref high
5
Critical range
2.5 N/A – 6.5 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84132
SNOMED
110742001
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?

The Bacteria in Breast Milk test is a laboratory analysis that detects and identifies bacteria present in a sample of breast milk. While breast milk naturally contains some bacteria that are beneficial for gut health, an overgrowth of certain harmful bacteria can cause infections and breastfeeding problems.

How is the sample collected?

A small sample of breast milk is collected into a sterile container. Before collecting, mothers should wash their hands thoroughly and clean the nipple area with sterile water or saline. The first few drops of milk should be discarded, and the sample should be taken from the middle of the feeding. The sample should be delivered to the laboratory within a few hours or refrigerated if there's a delay.

What do the results mean?

Results typically show whether bacteria are present and, if so, what type. Some common bacteria found in breast milk include Staphylococcus, Streptococcus, and in some cases, more concerning bacteria like MRSA. Your healthcare provider will interpret the results based on your symptoms and clinical history.

Reference range

Adult: 3.5-5.0 mmol/LN/A

Specimen: serum

No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Frequently asked questions

Does the presence of bacteria mean I should stop breastfeeding?
No, most mothers can continue breastfeeding even with a bacterial infection. In fact, breastfeeding helps clear the infection and provides antibodies to protect your baby. Only in rare cases will your doctor recommend temporarily stopping. The antibodies in your milk can actually help protect your baby.
Is it painful to have this test done?
The test itself is not painful. The only discomfort may come from collecting the milk sample if you have sensitive or infected breast tissue. The laboratory analysis is done on the milk sample after collection.
How long does it take to get results?
Results are typically available within 2-5 days, depending on whether bacterial cultures need to grow and be identified. Some preliminary results may be available sooner.
Can I prevent bacteria in my breast milk?
While some bacteria are natural and beneficial, you can reduce harmful bacteria by practicing good breast hygiene, washing your hands before breastfeeding or pumping, cleaning breast pump parts properly, and treating any breast infections promptly.
What happens if bacteria are found?
If harmful bacteria are detected, your healthcare provider will discuss treatment options, which may include antibiotics specifically targeted against the identified bacteria. It's important to complete the full course of any prescribed treatment.
  1. 1
    Mayo Clinic - MastitisSource
  2. 2
    La Leche League International - Breastfeeding InfoSource
  3. 3
    CDC - BreastfeedingSource

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