Stone composition changes what you do next, and a large proportion of fragments retrieved at ureteroscopy never reach a laboratory. The fragment goes into the suction canister, or into a pot that nobody labels, or into a report that nobody opens. The patient then gets generic advice about fluid intake, and returns in three years with the same stone.
Make retrieval and analysis a fixed step rather than an intention. Decide before the case that fragments will be collected, tell the scrub team, label the pot in theatre, and write the request at the same time as the operation note. Then close the loop: put the analysis result into the follow-up letter, because a composition result nobody reads is the same as no analysis.
The result changes management concretely. Uric acid stones are dissolvable with urinary alkalinisation and need no repeat procedure. Struvite means infection, and an incompletely cleared stone will regrow. Cystine means a lifelong metabolic diagnosis in a patient who is usually young. Calcium oxalate versus calcium phosphate points at different metabolic work-ups. None of that is available from the image.
- Agree fragment collection with the scrub team before the case starts, not during it.
- Label the specimen pot in theatre and write the request with the operation note.
- Put the composition result in the follow-up letter so the next clinician sees it.
- Do a metabolic work-up where the composition is uric acid, struvite or cystine, or where stones are recurrent.
- Tell the patient the composition and what it means — generic fluid advice is what they get otherwise.
Why it matters
Without a composition result, every stone patient gets the same generic prevention advice regardless of why they form stones.
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