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Quad Screen Results Interpretation

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Quad Screen Results Interpretation

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Markers to assess fetal well-being are often combined into a quad screen because their power lies in their use together. The quad screen views inhibin A, hCG, AFP and estriol levels to assess the fetus' risk of chromosomal abnormalities. Using these markers we can predict specific defects, like Down syndrome, which has a high hCG and inhibin A, or Turner syndrome, which has a very high hCG and inhibin A. Edward syndrome has a low hCG, estriol, and AFP. In Patau syndrome, AFP is normal.
8 KEY FACTS
MARKERS
AFP
Air Force Pilot

Alpha-fetoprotein (AFP) is found in both fetal serum and also amniotic fluid. This protein is produced early in gestation by the fetal yolk sac and then later in the liver and gastrointestinal tract. This value is then combined with other markers, as well as the mothers' age and family history to assess a risk for abnormalities.

Estriol
Extra-terrestial

Estriol is only produced in significant amounts during pregnancy, as it is made by the placenta. If levels of unconjugated estriol are abnormally low in a pregnant woman, this may indicate chromosomal or congenital anomalies like Down syndrome or Edward syndrome.

hCG
Hard-Core-Gnome

Human chorionic gonadotropin (hCG) is a hormone produced by a portion of the placenta following implantation. It is used to detect pregnancy, and diagnose and monitor germ cell tumors, as well as gestational trophoblastic diseases. It is combined with other markers to assess fetal disorders in the quad test.

Inhibin A
Inhibiting-chains Apple-tree

Inhibin is produced in the gonads, pituitary gland, placenta, corpus luteum and other organs. It plays a role in regulating FSH, but when combined with other serological markers, it is useful in screening for fetal disorders and aneuploidies.

ANEUPLOIDIES
Down Syndrome = HIgh
Child with Down Syndrome says HI

There is a high probability of Down syndrome with quad screen results showing low AFP, low estriol, high hCG, and high inhibin A. This can be recalled with "HI," representing high hCG and inhibin A.

Turner Syndrome = Very HIgh
Turnip says HI

There is a high likelihood of Turner syndrome in the fetus with quad screen results showing decreased AFP, decreased estriol, very high hCG, and very high inhibin A. The mnemonic Turner is "very high" represents a very high hCG and inhibin A.

Edward Syndrome = Low HEAp
Edward in a low HEAp

Quad screen results show a very low hCG, low estriol, and low AFP. These results are predictive of Edward syndrome. The mnemonic "Edward is a low HEAP" corresponds with low hCG (H), low estriol (E), and low AFP (AP). Inhibin A is usually normal in Edward syndrome.

Patau Syndrome = AFP is Normal
Paddles from Normal Air-Force-Pilot

Quad screen results showing a normal estriol, normal hCG, normal inhibin A, and normal AFP are indicative of Patau syndrome.

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