<<Disclaimer:  Verify this information before applying it to your situation.>>

people with Syymptoms of CD and/or positive blood tests ( antibodies)
should probably have a biopsy too confirm that they have CD.
Why?
Osteoporosis
subtle symptoms like chronic fatigue, depression etc
Risk of malignancy,
Certainty: usually needed to motivate diet compliance for life
Risk of developing symptoms later in life when it may not respond as well
to gluten withdrawal.
Perhaps to allow searches of another branch of the family related to 2nd
person.
as yet blood tests are not precise enough to make the diagosis without a
biopsy.  joe Murray
Disclaimer( not specific medical advice. Individuals should discuss
matters with their own doctor)