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Oxytoxin (or Oxytocin) in Plasma/Serum via Immunoassay Probe

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

This test measures the amount of oxytocin, a natural hormone that helps regulate uterine contractions during labor and breastfeeding, in your blood.

Quick summary

["Oxytocin levels may be checked to assess reproductive function or hormone balance."]

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

Key facts at a glance

LOINC
99021-8
Short code
K oxytoca DNA Ur Ql NAA+probe
Synonyms
K oxytoca DNA Ur Ql NAA+probe
Category
chemistry
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
probe-amp-tar
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like abnormal uterine contractions, infertility, or conditions affecting hormone regulation. It could also be part of monitoring during pregnancy or evaluating hormonal imbalances.

What to Expect Before the Test

No special preparation is usually needed, but you may be asked to fast for a few hours if blood is drawn. Wear comfortable clothing for easy access to your arm.

How the Test Works

A small sample of your blood is drawn and sent to a lab. The lab uses a specialized immunoassay probe to detect and measure oxytocin levels in your plasma or serum.

What the Results Mean

Results are typically reported as a concentration value (e.g., units per liter). Your provider will interpret these results in the context of your medical history and symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Elevated levels may be linked to conditions like pregnancy complications, certain cancers, or hormonal disorders. Low levels could suggest reproductive issues, thyroid problems, or other hormonal imbalances. Always discuss results with your healthcare provider.

Short name

Oxytocin Level

Frequently asked questions

How often will I need this test?
The frequency depends on your health condition and treatment plan. Your doctor will determine how often you need testing based on your symptoms and medical history.
What are the possible side effects of this test?
Most people experience only mild discomfort or bruising at the injection site. Rarely, there may be a slight swelling or redness. If you experience severe pain or allergic reactions, contact your healthcare provider immediately.
Can I eat or drink before this test?
Generally, no special diet is required, but follow your doctor’s instructions if they specify fasting for blood tests. Drink plenty of water unless advised otherwise.
  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