Triple test is to find out whether the fetus has Down syndrome or neural tube defect. It will not test for achondroplasia. Your risk of having a baby with achondroplasia is like the risk of any one else in the general population, i.e. about 1 in 30,000. The risk is increased if:
1. The diagnosis in the affected child is definitely achondroplasia.
2. None of you have any such problem.