Thumb Hypoplasia/Aplasia | Testing & Diagnosis

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.