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Your Medical Test Explained: What It Is, Why It Matters, and How to Understand Your Results

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

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.

Quick summary

{"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"}

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

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?
No, this is a screening test, not a diagnostic test. It is optional, and you can choose whether to have it performed. Your healthcare provider will discuss the benefits and limitations to help you make an informed decision.
Does an abnormal result mean my baby has a problem?
No, a screening test identifies risk, not definitive diagnoses. Most women with abnormal first trimester screen results have healthy babies. If your results show increased risk, your provider will discuss additional testing options to confirm or rule out any conditions.
How should I prepare for this test?
No special preparation is needed. You do not need to fast before the test. Simply schedule your appointment during the recommended 10-13 week window and inform your healthcare provider of any medications or supplements you are taking.
What if I miss the testing window?
If you are past 13 weeks of pregnancy, the first trimester screen is no longer accurate. Your healthcare provider may offer alternative screening tests such as the quad screen or cell-free DNA testing during the second trimester.
Will insurance cover this test?
Most insurance plans cover first trimester screening as part of routine prenatal care. Coverage may vary, so it is recommended to check with your insurance provider about specific coverage and any out-of-pocket costs.
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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