Shenzhen Customs in south China on Thursday intercepted 171 blood samples from pregnant women, which were supposed to be used for gender identification in Hong Kong.
The samples and some documents, including B mode ultrasound images of fetuses, were discovered in a baby carriage.
A female suspect claimed that she just wanted to make some money by taking the samples to Hong Kong at someone's request, and she knew nothing about what they would be used for.
Shenzhen Customs did not disclose her identity.
Identifying fetal gender for non-medical needs is prohibited in China.
In recent years, some intermediaries have tried to make profits by collecting pregnant women's blood samples and illegally sending them to Hong Kong for gender or gene tests.