A GP told me that a patient had shown her a leaflet
about an osteoporosis test sold by a local pharmacy.
This is a urine test sold directly to patients,
and costs about £20.
I think it is a collagen cross-link metabolite assay.
My question are:
What is the positive predictive value for, say,
fracture of the femur?
What is the sensitivity and specificity?
Is the £20 well spent?
Comments, or answers to any of these questions,
would be appreciated (especially from those of you
without a commercial interest).
Robin Marks
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