Calciuria
<p ><b>Urinary calcium</b> is <a href="http://en.wikipedia.org/wiki/Calcium_in_biology" title="Calcium in biology" >calcium</a> in the <a href="http://en.wikipedia.org/wiki/Urine" title="Urine" >urine</a>. It is termed <b>-calcuria</b> or <b>-calciuria</b> as a <a href="http://en.wikipedia.org/wiki/Suffix" title="Suffix" >suffix</a>.</p>
<h2 ></h2>
<h2 >Normal amount</h2>
<p >In a <a href="http://en.wikipedia.org/wiki/Urinalysis" title="Urinalysis" >urinalysis</a>, the normal amount of urinary calcium can be measured in amount per time (commonly per 24 hours). It can also be measured in amount per mass of <a href="http://en.wikipedia.org/wiki/Creatinine" title="Creatinine" >creatinine</a>, which avails for estimating the urinary calcium excretion in a spot urine sample, because urinary <a href="http://en.wikipedia.org/wiki/Creatinine_clearance" title="Creatinine clearance" class="mw-redirect" >creatinine clearance</a>is relatively unaffected by differences in <a href="http://en.wikipedia.org/wiki/Free_water_clearance" title="Free water clearance" >free water clearance</a> which occurs, for example, in <a href="http://en.wikipedia.org/wiki/Dehydration" title="Dehydration" >dehydration</a> and which would distort the interpretation of the urinary calcium in a spot urine sample.
Normally, in an average adult, the amount of calcium excreted in the urine is 100–250 mg (15–20 mmol) over a 24 hour period.<sup id="cite_ref-foley.26boccuzzi_0-0" class="reference" ><a href="http://en.wikipedia.org/wiki/Calciuria#cite_note-foley.26boccuzzi-0" >[1]</a></sup> For those on <a href="http://en.wikipedia.org/w/index.php?title=Low-calcium_diet&action=edit&redlink=1" class="new" title="Low-calcium diet (page does not exist)" >low-calcium diets</a>, there is normally 50–150 mg/24 hours, while those on a calcium-free diet will have 5–40 mg/24 hours.<sup id="cite_ref-foley.26boccuzzi_0-1" class="reference" ><a href="http://en.wikipedia.org/wiki/Calciuria#cite_note-foley.26boccuzzi-0" >[1]</a></sup>
<sup id="cite_ref-foley.26boccuzzi_0-1" class="reference" > </sup>
An abnormally high amount of urinary calcium is called <a href="http://en.wikipedia.org/wiki/Hypercalciuria" title="Hypercalciuria" >hypercalciuria</a> and an abnormally low amount is called <a href="http://en.wikipedia.org/wiki/Hypocalcuria" title="Hypocalcuria" class="mw-redirect" >hypocalcuria</a>.</p>