Question:easy
Struvite stone is caused by which metal?
Struvite stone is caused by which metal?
Show Hint
Struvite = magnesium ammonium phosphate, the infection or triple phosphate stone.
Updated On: Jun 23, 2026
- Magnesium
- Calcium
- Sodium & potassium
- Both (a) & (b)
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: Recall the five common urinary stones: calcium oxalate, calcium phosphate, magnesium ammonium phosphate (struvite), uric acid, and cystine.
Step 2: Focus on struvite. Its molecular formula is $MgNH_4PO_4 \cdot 6H_2O$, and the cation metal it carries is magnesium.
Step 3: Clinically these are infection stones - urease-splitting bacteria alkalinise the urine, allowing struvite and carbonate apatite to crystallise, which is why they grow large into staghorn calculi.
Step 4: Since calcium belongs to other stone types and sodium and potassium are not the answer, the metal of struvite is magnesium.\[\boxed{\text{Magnesium}}\]
Step 2: Focus on struvite. Its molecular formula is $MgNH_4PO_4 \cdot 6H_2O$, and the cation metal it carries is magnesium.
Step 3: Clinically these are infection stones - urease-splitting bacteria alkalinise the urine, allowing struvite and carbonate apatite to crystallise, which is why they grow large into staghorn calculi.
Step 4: Since calcium belongs to other stone types and sodium and potassium are not the answer, the metal of struvite is magnesium.\[\boxed{\text{Magnesium}}\]
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