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Information for children, teenagers and families

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Bone density (DEXA) scans

DEXA stands for "dual energy X-ray absorptiometry". DEXA (sometimes DXA) scans are used to measure the mineral density of bone, which can indicate the strength of bones. Although DEXA scans do use radiation, the amount is at a much lower level of radiation than standard X-rays.

It is common for teenagers with CF to have lower than average bone density - the reasons why are poorly understood, but are to do with having a long term condition where there is low-grade inflammation (see section on Problems that might happen). We will order routine DEXA scans on all teenagers from the age of 14 years. Usually only one scan is needed. If there are other risk factors for low bone mineral density (particularly repeated courses of oral steroids), then DEXA scan may be done when children are younger than 14 years. The main result we look at from the DEXA scan in the density of the bones in the lumbar spine.