Diagnosis & Imaging
Maternal serum AFP
Maternal serum AFP is a blood test measuring alpha-fetoprotein in the mother's blood as part of prenatal screening.
In short: Maternal serum AFP
- It is often normal in encephalocele.
- It is a screening test, not a diagnostic one.
- A normal result does not rule out encephalocele.
- Imaging is needed to detect and characterize encephalocele.
What it is
It is a blood test that measures alpha-fetoprotein in the mother's blood during pregnancy, as part of prenatal screening. It is a screening test that can flag a higher chance of certain conditions.
Understanding Maternal serum AFP
Because most encephalocele sacs are skin-covered, maternal serum AFP is often normal even when an encephalocele is present, so a normal result does not rule it out. As a screening test, it indicates risk rather than providing a diagnosis; imaging is needed to detect and characterize an encephalocele. Recognizing this limitation helps avoid false reassurance.
Why it matters
Understanding maternal serum AFP helps families see why a normal blood screen does not exclude encephalocele and why imaging is the definitive way to detect it.
Common questions
Is maternal serum AFP usually normal in encephalocele?
Often yes, because most sacs are skin-covered.
Is it diagnostic?
No — it is a screening test.
What detects encephalocele?
Imaging.
Bottom line
Maternal serum AFP is a screening blood test often normal in encephalocele, so imaging is needed for detection.
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