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: Maternal Cell Contamination Analysis, Amniotic Fluid

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

: This test checks whether a sample of amniotic fluid contains cells from the mother, which could interfere with the accuracy of genetic testing on the baby's cells.

Quick summary

[": Maternal cell contamination testing helps confirm that genetic results from an amniotic fluid sample truly reflect the baby and not the mother."]

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

Key facts at a glance

LOINC
35457-1
Short code
Maternal Cell Contam Amn
Synonyms
Maternal Cell Contam Amn
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

: What Is This Test?

: During pregnancy, a small sample of amniotic fluid may be collected for genetic testing. This test evaluates whether cells from the mother are mixed in with the sample, which is important because maternal cells can affect the accuracy of results meant to describe the baby.

: Why Is It Done?

: Maternal cells can sometimes be present in amniotic fluid samples. If they go undetected, they could be mistaken for the baby's cells and lead to incorrect interpretations. This analysis helps laboratories confirm that the sample is suitable for reliable genetic testing.

: How the Sample Is Collected

: The amniotic fluid sample is typically obtained through a procedure called amniocentesis, in which a healthcare provider uses a thin needle to withdraw a small amount of fluid from the uterus. The sample is then sent to a laboratory for analysis and any related genetic testing.

: What the Results Mean

: Results generally indicate whether maternal cell contamination is present and, if so, whether it is at a level that could affect test interpretation. Your healthcare provider or genetic counselor can explain what the findings mean for your specific situation and any additional testing that may be needed.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

: Detecting maternal cell contamination is important for the accuracy of prenatal genetic testing. When contamination is identified, laboratories can adjust their interpretation or request a new sample, helping to ensure that genetic findings reflect the baby rather than the mother.

Short name

: Maternal Cell Contamination Testing

Frequently asked questions

: Does this test diagnose a genetic condition?
: No. This test evaluates sample quality by checking for maternal cells. It supports the accuracy of other genetic tests but does not itself diagnose a condition.
: Is the test painful?
: The test itself is performed on fluid already collected during amniocentesis. Any discomfort is related to the amniocentesis procedure, not to this laboratory analysis.
: What happens if maternal cells are found?
: If maternal cell contamination is detected, your care team may interpret the results with caution or recommend additional testing. A genetic counselor can discuss the options and what they mean for you.
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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