Imperial Collage Healthcare

Renal stone analysis (calculi)


Test Background
Kidney stones are solid accretions of dissolved minerals in urine found inside the kidneys or ureters. These are subsequently expelled in the urine stream, leading to ureteric obstruction and distension. Stones form around a central nidus from which a crystalline structure expands and are typically derived of calcium salts (of which calcium oxalate predominates). Other examples of calculi include the (urea-splitting) bacterially-derived struvite (Mg, NH4 and PO4), uric acid and cystine.


Clinical Indications
All renal calculi should be analysed Symptoms of nephrolithiases include: renal colic, (acute and spasmodic flank pain) nausea, UTI, haematuria and vomiting


Reference Range

We provide fully quantitative reporting of all major stone components. Results are reported as weight of stone, description and percentage composition.


Sample Required
Renal stone


Sample Collection
Sterile universal


Sample Volume
Ideally 10 mg


Transport/Storage
Stable at ambient temperature, send by first class post.


Turnaround Time

2 weeks


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