Procedures and treatments

Preparing a child for a procedure or treatment can be an anxious occasion. Great Ormond Street Hospital have produced a number of factsheets to help explain what will happen and what to expect.

Procedures and treatments search

Search for information on procedures and treatments at Great Ormond Street Hospital.

Bone marrow test

Bone marrow is the soft tissue inside bones that is responsible for producing new blood cells. A bone marrow test (or biopsy) is a procedure that doctors use to examine the bone marrow inside certain bones.

Alveolar bone grafts

The alveolus is the part of the bone that holds our teeth. The alveolus is made of alveolar bone. Some people with a cleft lip and palate can also have a cleft defect of the alveolus, where there is a gap in the alveolar bone. They sometimes also have a hole in the roof of their mouth which connects with their nose. This hole is called a fistula.


A colonoscopy is a test that allows the doctor to look at the colon for any abnormalities. This is to confirm or rule out a condition or diagnosis. A colonoscopy is the ‘gold standard’ way of assessing the gut.