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The size and shape of kidney stones

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I have kidneystones and not sure if i passed one.Could you please tell me what one would look like when it comes out.Thank you for any help with this

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replied January 25th, 2010
Kidney Conditions Answer A9494
Hi, welcome to the ehealth forum and I am glad to help you.
You seem to be concerned about the size and shape of kidney stones. Most of the stones less than 4 mm will pass spontaneously in urine without the need for any intervention and stones greater than 6 mm in size may require intervention.

The most common type of kidney stone is composed of calcium oxalate and calcium phosphate crystals, occurring in about 80% of cases. Cystine crystals in urine appear as flat, hexagonal plates. Struvite stones appear in the urine as rectangular prisms resembling coffin lids. A stone can traverse the urinary tract without symptoms but the passage usually produces pain and bleeding. Straining the urine(by urinating through a tea strainer or stonescreen) allows collection of the stone when it passes.
Hope this helps. Take care.

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