Final answer:
The answer is colposcopy. Chorionic villus sampling, amniocentesis, and karyotype are the methods used to detect fetal abnormalities.
Step-by-step explanation:
The answer to the question is colposcopy. Colposcopy is not a method used to detect fetal abnormalities. It is a procedure that examines the cervix using a special instrument called a colposcope. Chorionic villus sampling, amniocentesis, and karyotype are all methods that can be used to detect fetal abnormalities. Chorionic villus sampling involves taking a sample of cells from the placenta to test for genetic disorders. Amniocentesis involves collecting a sample of the amniotic fluid surrounding the fetus to test for genetic abnormalities. Karyotype is a technique that allows for the visualization of an individual's chromosomal composition to identify genetic abnormalities.