Sally Phillips won praise on Twitter for creating A World Without Down's Syndrome?, a difficult-to-watch but thought-provoking BBC Two documentary.
The Bridget Jones actress, 46, embarked on a journey to investigate the medical profession's views over Down's babies, and the pregnant mothers-to-be who are expecting them.
She explored the screening processes, including a new method which intends to eradicate the condition, and what life is like raising a disabled child.
While looking into the diagnosis and high rate of termination for expectant mums who are likely to give birth to a Down's baby, she asked: "Why is everyone behaving that it's a catastrophe?"
Another part of the programme saw her meeting with a doctor who described raising a child with Down's as "a burden for a long time" because it is a mental disability and that "they live for many years".
She also visited Iceland, which has a 100% termination rate in Down's cases after the introduction of the prenatal test.
Viewers watching the programme took to Twitter to praise Sally for her efforts, and for raising awareness of the issues surrounding Down's syndrome.
Down's syndrome is a genetic condition, caused by an extra copy of chromosome 21 (most people have 23 pairs of chromosomes) that leaves the person with differing levels of learning disability as well as physical and medical issues, such as heart or thyroid defects.
However, aside from the praise, other Twitter users thought that Sally was making mothers feel bad for terminating a Down's baby, while raising the point that it is solely up to the individual and their situation.