Ever-Fed Breast Milk Phenotype
A laboratory characterization of breast milk that classifies its composition or characteristic profile.
["This test describes the characteristic composition of a breast milk sample."]
Key facts at a glance
- LOINC
- 61434-7
- Short code
- Ever fed breast milk PhenX
- Synonyms
- Ever fed breast milk PhenX
- 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
- Method
- phenx
- 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 test evaluates a breast milk sample to determine its phenotype, meaning the pattern of components or characteristics present in the milk. The exact markers assessed depend on the laboratory's testing method.
Why might I need this test?
Breast milk phenotype testing may be used to characterize milk composition for nutritional or clinical assessment. A clinician or lactation specialist can explain the reason for testing and how the result relates to the mother or infant.
How is the test performed?
Breast milk is collected, usually by pumping, and placed in the container supplied by the laboratory. The sample is then analyzed for the markers used to define its phenotype, and the laboratory reports the resulting pattern or category.
How do I prepare for the test?
Fasting is generally not required. Follow the laboratory's collection instructions, including cleaning pump parts, using the recommended container, and labeling the sample with the collection date and time.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Results can show differences in the composition or pattern of components in breast milk. These differences may be associated with factors such as gestational age, maternal health or diet, and milk handling. Interpretation should be based on the specific markers tested and the clinical reason for the test.
Short name
Breast milk phenotype
Frequently asked questions
What does a breast milk phenotype mean?
Is this the same as a breast milk culture?
Can this test diagnose a condition in the mother or infant?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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