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Pregnancy-Associated Plasma Protein-A ( PAPP-A )

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Pregnancy-Associated Plasma Protein-A (PAPP-A) Test

The Pregnancy-Associated Plasma Protein-A (PAPP-A) Test measures the level of PAPP-A, a protein produced by the placenta during pregnancy. It is primarily used in first-trimester screening to assess the risk of chromosomal abnormalities, such as Down syndrome (Trisomy 21), Edwards syndrome (Trisomy 18), and Patau syndrome (Trisomy 13).

Why is the Test Done?

✅ First-trimester screening (between 9 and 13 weeks of pregnancy)
✅ Assess risk of chromosomal abnormalities (when combined with hCG and nuchal translucency ultrasound)
✅ Evaluate placental function (low levels may indicate poor placental development)
✅ Predict risk of pregnancy complications (e.g., preeclampsia, stillbirth, intrauterine growth restriction – IUGR)

Normal PAPP-A Levels

PAPP-A levels vary by gestational age. Typically, levels increase throughout pregnancy.

📌 Results are given as “Multiples of the Median” (MoM):

  • Normal Range: 0.5 – 2.0 MoM
  • Low PAPP-A: <0.4 MoM (linked to higher risk of complications)

⚠ Each lab may have slightly different reference ranges, and results should be interpreted in combination with other tests.

Interpreting Abnormal PAPP-A Levels

PAPP-A Level Possible Interpretation
Low PAPP-A (<0.4 MoM) Increased risk of Down syndrome (Trisomy 21), Edwards syndrome (Trisomy 18), Patau syndrome (Trisomy 13), preeclampsia, growth restriction, stillbirth
Normal PAPP-A (0.5–2.0 MoM) Normal pregnancy, low risk of chromosomal abnormalities
High PAPP-A (>2.5 MoM) Usually not concerning, but may be linked to a larger baby (macrosomia)

📌 Low PAPP-A alone does not confirm a chromosomal disorder—it must be combined with other tests for a complete risk assessment.

What Happens If PAPP-A is Low?

🔬 Additional Tests May Be Recommended:

  • hCG (Human Chorionic Gonadotropin) Test – Combined with PAPP-A for screening
  • Nuchal Translucency (NT) Ultrasound – Measures fluid at the back of the baby’s neck
  • Non-Invasive Prenatal Testing (NIPT) – Checks fetal DNA for chromosomal conditions
  • Amniocentesis or Chorionic Villus Sampling (CVS) – Confirms chromosomal abnormalities

💊 Pregnancy Monitoring & Management:

  • Frequent Ultrasounds – To monitor fetal growth
  • Blood Pressure Checks – To detect preeclampsia early
  • Aspirin Therapy (if recommended) – May reduce risk of complications