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Magnesium and ammonium phosphate stones

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Magnesium ammonium phosphate stones account for 10 - 15% of urinary tract stones. They are unusual in that they often occur in alkaline, infected urine whereas other urinary tract stones tend to arise in sterile, acid urine.

Triple stones tend to be white and chalky, and may be quite soft. They are associated with urea splitting bacteria such as Proteus and some Staphylococci which convert urea to ammonia, so alkalinizing the urine and precipitating magnesium ammonium phosphate.

As urea is plentiful in urine, these stones may grow to a large size and fill the renal pelvis - staghorn calculus.


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The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

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