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Serum or plasma concentration of oxytocin (substance concentration)

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

This test measures the amount of oxytocin, a hormone that helps regulate childbirth and breastfeeding, in your blood.

Quick summary

["Oxytocin helps control uterine contractions during labor and milk production after delivery."]

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

Key facts at a glance

LOINC
103186-3
Short code
K.pna + K.oxytoca DNA Wnd Ql NAA+probe
Synonyms
K.pna + K.oxytoca DNA Wnd 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 Might Be Ordered

Your healthcare provider may order this test if you have symptoms related to oxytocin imbalances, such as complications during pregnancy, postpartum issues, or suspected hormone-related conditions. It could also be part of monitoring for conditions affecting hormone levels or reproductive health.

What to Expect Before the Test

No special preparation is typically needed. You may fast before the test if instructed, but your provider will guide you. Bring any medications or supplements you’re taking, as they could affect results.

During the Test

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but it usually doesn’t cause discomfort. The blood sample will be sent to a lab for analysis.

What the Results Mean

Results are interpreted based on your medical history, symptoms, and other lab findings. Abnormal levels may suggest conditions like postpartum hemorrhage, hormone deficiencies, or rare metabolic disorders.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Oxytocin levels can be critical in diagnosing or managing conditions like postpartum hemorrhage, where low levels may indicate insufficient hormone function. It may also help assess reproductive health, especially in cases of infertility or complications during pregnancy.

Short name

Oxytocin Level

Frequently asked questions

Will this test affect my medications?
Some medications, especially those affecting hormone levels, could influence oxytocin results. Always inform your provider about all medications, including supplements, before the test.
How long will I need to wait for results?
Results typically take 1–3 business days, depending on lab processing times. Your provider will discuss findings with you during your follow-up visit.
Can I eat or drink before this test?
Standard fasting rules may apply, but your provider will specify. Avoid caffeine or alcohol before testing, as they could affect hormone levels.
  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