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Stones: Predicting stone episodes using cystine capacity

Cystine capacity is an assay for assessing urinary cystine saturation and risk of a stone episode in patients with cystinuria. Lowering the threshold for this test improves its sensitivity, potentially enabling relaxation of follow-up regimens for patients at lowest risk of stone episodes and dose modification of medications for those at highest risk.

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Author information


  1. Matthew Bultitude and Kay Thomas are at the Stone Unit, Guy's and St Thomas' NHS Foundation Trust, 1st Floor Southwark Wing, Guy's Hospital, Great Maze Pond, London SE1 9RT, UK.

    • Matthew Bultitude
    •  & Kay Thomas


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Competing interests

The authors declare no competing financial interests.

Corresponding authors

Correspondence to Matthew Bultitude or Kay Thomas.