A Appendix 1 - notation & abbreviations

A.1 Notation

For the hypothetical substance, X:

• $\text{plasma concentration}=P_X$
  
• $\text{urine concentration}=U_X$
  
• $\text{clearance}=C_X$
  
• $\text{exchangeable X}=X_e$

A.2 Glossary of abbreviations

Term	Abbreviation
anion gap	$AG$
corrected anion gap	$cAG$
creatinine	$creat$
electrolyte-free water	$H_{2}O\left(e\right)$
osmolality (in mOsm/kg)	$Osm$
osmolar gap	$OG$
osmolar load (in milliosmoles, mOsm)	$OL$
other effective osmoles	$OEOs$
total body water	$TBW$
transtubular potassium gradient	$TTKG$
urinary anion gap	$UAG$
urinary osmolar gap	$UOG$
urine flow rate	$\dot{V}$
urine volume	$V$