Testing & Diagnosis for Thumb Hypoplasia/Aplasia in Children

How is an underdeveloped or absent thumb diagnosed?

•   Thumb hypoplasia and aplasia are usually detected during your baby’s first
    newborn exam.
•   Seeing this deformity will prompt your child's doctor to look for other
    deformities that are sometimes associated with this condition.
•   An x-ray can help doctors examine the internal structures of your child’s
    thumb.
•   Other tests will depend on whether the doctor believes the thumb deformity
    is associated with another condition.