This web site uses cookies. Do you accept the use of external cookies? Yes No Know more x
Survey about achondroplasia
We have designed a questionnaire with the purpose to better know the population connected to achondroplasia.
The questionnaire is optional and anonymous. The data obtained will be used for statistical purposes and to better understand the natural history of achondroplasia. Please consider answering.
If you would like to take the survey later, you can click on the link at the top "Register at BA"
The following table shows what exams and tests must be performed at what ages by the paediatrician in order to prevent complications:

Trotter Table
X - To be performed; S - Subjective, by history; O - Objective, by a standard testing method; R - Discuss referral to a specialist; >>> - Continue to monitor.
OFC - Occipital-Frontal Circumference.
Adapted from: Trotter & Hall, 2005

  • Molecular/genetic testing should be done in children who are atypical or to differentiate from other similar diseases. It isn't necessary in every case where the achondroplasia diagnosis is suspected [1];

  • CT scans (computer tomography scan) and MRIs (magnetic resonance imaging) are imaging techniques used, in this case, to detect Foramen Magnum stenosis, one of the most worrisome complications in achondroplasia. Each has its advantages and disadvantages [1];
  • Polysomnographies are also called sleep studies and are used to diagnose and monitor sleep disorders (the most common in achondroplasia is sleep apnea) [1];
  • Neural ultrasonography such as transfontanelar ultrasound are imaging techniques used for monitoring ventriculomegaly (one of the causes for the large head) and excessive extra-axial fluid, which are common benign accompaniments of achondroplasia;
  • When testing for hearing, the result will be an audiogram, which is a graphical display of the hearing test for each ear. It measures  the limits of both the intensity and the frequency range the child can hear. [2]


  1. Trotter, T.L. and J.G. Hall, Health Supervision for Children With Achondroplasia. Pediatrics, 2005. 116(3): p. 771-783.
  2. Johns Hopkins Medicine. Understanding Your Audiogram. [cited 2017 05/09].
To view this site you need Internet Explorer 8 (or a higher version)
or another internet browser.

Thank You.