Hi, a quick question, i have a six week old niece, when she was born there was worries she was down syndrome , she got all the tests and thank god they came back clear, my question is could the tests have been wrong, cause there is times you look at her a

No.: The diagnosis is always based on the presence of an extra number 21 chromosome on a karyotype (a picture of an individual's chromosomes).

Test limits: I will assume that the tests that were completed was specific to look for a chromosomal abnormality. The typical ds diagnosis can be ruled out, but the test does not exclude other problems that can give an infant an unusual look, or might be a problem in the future. The pcp can monitor the situation over time & look for other issues if there appears to be a need for additional study.