DNA Ploidy Analysis (Fetal Chromosomal Content)
This test measures the number of chromosomes in fetal cells to assess whether the fetus has the expected number (typically 46 chromosomes) or an abnormal number (such as 45 or 47). It helps identify potential chromosomal abnormalities early in pregnancy.
["Helps detect chromosomal issues that may affect fetal development."]
Key facts at a glance
- LOINC
- 30917-9
- Short code
- DNA Ploidy Spec FC-Imp
- Synonyms
- DNA Ploidy Spec FC-Imp
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- flow-cytometry
- 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
What This Test Measures
DNA ploidy analysis evaluates the genetic material (DNA) from fetal cells to determine if the number of chromosomes is normal or abnormal. In this case, the test focuses on identifying whether the fetus has a diploid (2n) or aneuploid (e.g., triploid, tetraploid) chromosomal complement. This is often done through a sample of fetal cells obtained via procedures like chorionic villus sampling (CVS) or amniocentesis.
How the Test Works
The test uses advanced genetic techniques, such as fluorescence in situ hybridization (FISH) or similar molecular methods, to count and compare the DNA content of fetal cells. By analyzing the distribution of chromosomes, healthcare providers can determine if there is an imbalance that might indicate conditions like Down syndrome, Turner syndrome, or other chromosomal disorders.
When This Test Is Performed
This test is typically performed during the first or second trimester of pregnancy, often as part of a prenatal screening or diagnostic evaluation. It may be recommended if there are concerns about chromosomal abnormalities based on ultrasound findings, maternal age, or other risk factors.
Preparation for the Test
There is usually no special preparation needed for DNA ploidy testing. The procedure to obtain fetal cells (such as CVS or amniocentesis) involves a minor medical intervention, and you may be asked to rest or stay still for a short period afterward.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
DNA ploidy analysis is crucial for identifying chromosomal abnormalities that can impact fetal health. Abnormal ploidy (e.g., triploidy or tetraploidy) is associated with severe pregnancy complications, including miscarriage, stillbirth, or congenital anomalies. Detecting these conditions early allows for informed decision-making about pregnancy management, including potential interventions or termination if necessary.
Short name
Fetal Chromosome Ploidy Screening
Frequently asked questions
What does a DNA ploidy test tell me about my baby’s chromosomes?
How is DNA ploidy testing different from standard prenatal screening tests like nuchal translucency or maternal blood tests?
Is DNA ploidy testing safe for both mother and baby?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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