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submitted by brethren_md(44),

Requires knowing how to calculate an anion gap - look it up. In this case, it is a normal anion gap metabolic acidosis. Know the mneumonics MUDPILES and HARDASS. Renal Tubular acidosis is the only answer choice that is an example of a normal anion metabolic acidosis.

mousie  Anion Gap: Na - (Cl + HCO3) = normally around 10-12 +1  
seagull  good to know. I keep looking up the urine values but all it said was "varies", then I threw my computer and yelled "does that vary Mother F****ers. I do feel better now. +14  
_yeetmasterflex  glad I wasn't the only one who got very pissed off at the urine values +1  
fulminant_life  Usually the first thing I look at is whether or not the Cl- is high. Generally if the Cl- is high its going to be a normal gap +1  
henoch schonlein  i think they gave you the urine values bc you can calculate the URINE anion gap which is (Na + K - Cl). In this case the Urine Anion Gap is positive (5). Boards and Beyond mentions that a positive UAG is due to Renal Tubular Acidosis Type 1 (inability of alpha intercalated cells to secrete hydrogen ions). just another approach to answer this q +6  
270onstep1  Actually diarrhea is the "D" in "HARDASS"(reason why I was stuck between Chron's and RTA). Ended up getting it right with RTA.. +