Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Follow-up depends on whether arachnodactyly is isolated or part of another condition.
If an evaluation finds no related disorder, routine medical care may be all that is needed.
Reassessment can be appropriate if new features develop during growth or if the family history changes.
Arrange routine follow-up if there is increasing hand or foot pain, loss of movement, reduced ability to complete daily tasks, worsening vision, new joint problems, or concern about growth or spinal posture.
These concerns are usually not emergencies, but they deserve assessment.
The article also says
People with a confirmed genetic or metabolic condition may need coordinated care involving primary care, cardiology, medical genetics, ophthalmology, orthopedics, physical or occupational therapy, and other specialists.
The schedule for examinations and imaging depends on the diagnosis, age, previous results, and rate of change.
Keep copies of genetic test reports, imaging measurements, and specialist notes.
A record of aortic measurements is especially useful because trends over time can matter more than one result.
Every sign above is quoted from the sofidex article on Arachnodactyly. If you are not sure, err upward — it is always reasonable to be checked.