a. What do the three letters represent mnemonically?... RTA

b. What is a urea splitting infection?...

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Lith O Link
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Primary Urine Chemistry Data
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Dynamic Probability Ranging:
Large and bold, like a stone forming patient
(all values are mg/day except as noted below; normal ranges as below).

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Cit 24  Urine Citrate    Date Urine Collection
802                      2/16/2004  
1074 [ font very tiny ]  8/18/2003
1023 [ font very tiny ]  8/17/2003
men >450, women >550:
when low, consider K citrate 25 bid;
if from RTA (urine pH > 6.5) also use K citrate.

SS CaP  Supersaturation CaP
0.31 [ font very tiny ]      2/16/2004
1.95 [ font Bold ]           8/18/2003  
2.61 [ font Bold ]           8/17/2003
0.5-2;
correlates with CaP stones.
Urine urually pH > 6.5,
IH common.

UpH  24 Hour Urine pH
5.478 [ font slightly larger and bold ]  2/16/2004  
6.229                                    8/18/2003  
6.847 [ font Bold ]                      8/17/2003  
5.8-6.2;
<5.8 consider K or Na citrate 25-30 mEq BID;
6.5, RTA if citrate is low;

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Reference
http://litholink.com