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Protein Content in Milk (Mass Concentration)

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

This test measures the total protein content in your milk, which helps assess nutritional quality or potential issues like low protein levels.

Quick summary

["Understanding your milk’s protein content can guide feeding decisions or identify potential dietary concerns."]

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

Key facts at a glance

LOINC
38751-4
Short code
PPD Air-mCnc
Synonyms
PPD Air-mCnc
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Matters

High protein levels in milk may indicate adequate nutrition or certain lactation conditions, while low levels could suggest dietary deficiencies or medical conditions affecting milk production. Your healthcare provider may order this test if you’re breastfeeding, have concerns about milk quality, or experience unusual symptoms.

What to Expect During the Test

You’ll provide a sample of your milk (typically collected via breast pump or manual expression) into a sterile container. The sample is then sent to a lab for analysis. No special preparation is needed, but timing may depend on your feeding schedule.

Common Reasons for Testing

Doctors may order this test if you’re breastfeeding and want to ensure your milk meets nutritional standards, if you’re experiencing low milk supply or unusual milk composition, or if you’re investigating potential allergies or dietary needs of your baby.

What the Results Mean

Results are reported as a mass concentration (e.g., grams per liter). While reference ranges vary by lab, very low or very high values may prompt further evaluation by your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Protein in Milk

Short name

Milk Protein Level

Frequently asked questions

How long does it take to get my results back?
Results are usually available within 1–3 business days, depending on lab processing times. Your healthcare provider will contact you once they’re ready.
Can I eat or drink anything before the test?
No special diet or fasting is required. However, if you’re using a breast pump, ensure the sample is collected at a time that reflects your typical milk production (e.g., after feeding).
Will this test affect my milk supply?
No, this test does not influence your milk production. The sample is collected without discomfort, and your supply will remain unaffected.
  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