Blood test at 16 weeks?

Question

Why do they take more blood at 16 weeks ? They just took 8 vials at 12weeks is this more testing for genetic screening ? Just curious .

Answer

My Dr avised against doing afp at 16 weeks and said the anatomy scan at 18 weeks is a better indicator for major spinal problems. Said the blood test will show minor abnormalities that aren't cause for concern and coukd stress me out and said to wait.

Answer

Found this online:
Second trimester prenatal screening may include several blood tests, called multiple markers.  These markers give information about a woman's risk of having a baby with certain genetic conditions or birth defects. Screening is usually done by taking a sample of the mother's blood between the 15th and 20th weeks of pregnancy (16th to 18th is ideal). The multiple markers include:
Alpha-fetoprotein screening (AFP). This blood test measures the level of alpha-fetoprotein in the mothers' blood during pregnancy. AFP is a protein normally produced by the fetal liver and is present in the fluid surrounding the fetus (amniotic fluid), and crosses the placenta into the mother's blood. The AFP blood test is also called MSAFP (maternal serum AFP).

Answer

it could be anatomy testing thats usually around the time they do it 16-20 weeks

Blood test at 16 weeks?

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