Skip to content

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 uterine contractions during labor and plays a role in bonding and milk ejection. Oxytocin levels may be checked in pregnancy, postpartum, or during certain medical evaluations.

Quick summary

["Oxytocin helps with childbirth, breastfeeding, and emotional connections."]

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

Key facts at a glance

LOINC
85774-8
Short code
K oxytoca DNA Bld Pos Ql NAA+n-prb
Synonyms
K oxytoca DNA Bld Pos Ql NAA+n-prb
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
non-probe-amp-tar
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why Might This Test Be Ordered?

Your healthcare provider may order this test if you’re experiencing complications during pregnancy, such as preterm labor, or if you have concerns about postpartum uterine contractions or milk production. It could also be part of a broader evaluation for conditions affecting hormone balance or reproductive health.

What Does a Result Mean?

Results are not typically provided as absolute values in this compressed format, but they reflect the relative concentration of oxytocin in your sample. Interpretation depends on clinical context, such as whether the test was done during pregnancy, postpartum, or for another reason.

Sample Collection and Preparation

Blood is drawn from a vein in your arm, and the sample is processed into either serum (after clotting) or plasma (using an anticoagulant). Oxytocin is measured in the serum or plasma portion of the blood.

Common Causes for Testing

Tests for oxytocin may be ordered to assess labor progression, evaluate postpartum complications, diagnose hormonal imbalances, or investigate symptoms like uterine hyperactivity or infertility.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Oxytocin’s Role and Potential Implications

Short name

Oxytocin Level

Frequently asked questions

What are the normal ranges for oxytocin?
Standard reference ranges for oxytocin vary by context (e.g., pregnancy vs. non-pregnant) and may not be universally defined in this format. Your provider will consider clinical context, such as timing of the sample (e.g., during labor) and symptoms you’re experiencing, rather than relying solely on a numeric range.
How soon after my blood draw will I get results?
Results are typically available within a few days to a week, depending on lab processing and your healthcare provider’s workflow. Follow-up with your provider to discuss findings.
Can I take anything special to prepare for this test?
No special preparation is needed for this test. However, inform your provider about any medications or supplements you’re taking, as they may 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