Your Medical Test Explained: What It Is, Why It Matters, and How to Understand Your Results
A blood test performed between 10-13 weeks of pregnancy to measure pregnancy hormones and proteins, helping assess fetal health and screen for certain chromosomal conditions.
{"This test uses a blood sample to measure key pregnancy hormones and proteins","It helps screen for chromosomal conditions like Down syndrome (Trisomy 21)","The test is typically performed between weeks 10-13 of pregnancy","Results help healthcare providers monitor pregnancy health","Abnormal results may require additional testing for confirmation"}
Key facts at a glance
- LOINC
- 48798-3
- Short code
- 1st trimester maternal scn Pnl SerPl
- Synonyms
- 1st trimester maternal scn Pnl SerPl
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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
This test is a diagnostic procedure that helps your healthcare provider learn more about how your body is functioning. Depending on what your provider has ordered, it may involve a small sample of blood, urine, or other tissue, or it may use imaging technology to look inside your body. The information gathered helps check for signs of illness, monitor an existing condition, or confirm that a current treatment is working as expected.
The First Trimester Maternal Screen is a blood test that measures specific hormones and proteins in a pregnant woman's blood during the first trimester (weeks 10-13). This panel typically includes: Pregnancy-Associated Plasma Protein A (PAPP-A) and Human Chorionic Gonadotropin (hCG), along with other pregnancy-related hormones. When combined with an ultrasound measurement of the nuchal translucency (fluid at the back of the baby's neck), it creates a comprehensive screening assessment.
This test provides valuable information that cannot always be gathered from a physical exam alone. It can help detect health problems early, often before you notice any symptoms, which may allow treatment to begin sooner. It also helps your provider track changes in your health over time, adjust medications safely, and make well-informed decisions about your ongoing care.
This screening test helps healthcare providers assess the health of your pregnancy. It can indicate whether there may be an increased risk for certain chromosomal conditions such as Down syndrome (Trisomy 21), Trisomy 18, and Trisomy 13. The test also provides information about how the pregnancy is progressing and whether there may be concerns for miscarriage or other complications.
The exact steps depend on the type of test your provider ordered. For most blood or urine tests, a trained technician will collect a small sample, which usually takes only a few minutes and may cause brief, mild discomfort. For imaging or specialized tests, you may be asked to change into a gown, lie still on a table, or hold your breath for short moments. The staff will explain each step beforehand, and you can ask questions at any time.
A healthcare professional will draw a small blood sample from a vein in your arm. The procedure only takes a few minutes and may cause minimal discomfort or bruising at the injection site. The blood sample is then sent to a laboratory for analysis. Results are typically available within a few days to a week.
Your results will be reviewed by your healthcare provider, who will explain what the numbers or findings mean for you. Some results fall within a normal range, while others may be slightly high or low and still be nothing to worry about. If anything looks unusual, your provider may recommend repeat testing or additional exams before making a diagnosis. Ask about anything you do not understand, and follow any instructions about follow-up visits or lifestyle changes.
Your results will be presented as a risk assessment (such as '1 in 1,000' chance) rather than a simple positive or negative. A 'screen positive' result means there is a higher risk for certain conditions, but it does not confirm that the baby has a problem. Further diagnostic testing (such as chorionic villus sampling or amniocentesis) can provide definitive answers if needed.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Is this test mandatory?
Does an abnormal result mean my baby has a problem?
How should I prepare for this test?
What if I miss the testing window?
Will insurance cover this test?
Sources
- 1
- 2
- 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