Abbreviation	Abbreviated Entity
[Na+]S	Serum sodium concentration
[Na+]SW	Sodium concentration in serum water
[Na+]Scor	Serum sodium concentration in hyperglycemia corrected for normalization of serum glucose without changes in body sodium, potassium, or water
[Na+]U	Sodium concentration in urine
TBNaExch	Total body exchangeable sodium
[K+]U	Potassium concentration in urine
VU	Urine flow rate
TBKExch	Total body exchangeable potassium
TBW	Total body water
SWC	Serum water content
SSC	Serum solid content
[Osm]LS	Serum osmolality
[Osm]RS	Serum osmolarity
[Gap]OsmS	Serum osmol gap
[Osm]LU	Urine osmolality
[Ton]S	Serum tonicity (effective osmolarity)
CHF	Congestive heart failure
CKD	Chronic kidney disease
ADH	Antidiuretic hormone (vasopressin)
SIADH	Syndrome of inappropriate antidiuretic hormone secretion
ECV	Extracellular volume
EABV	Effective arterial blood volume
AVPR2	Arginine vasopressin receptor 2
CSW	Cerebral salt wasting
Il-6	Interleukin-6
HPRwsp	Haptoglobin-related protein without signal peptide
ANP	Atrial natriuretic peptide
BNP	Brain natriuretic peptide
NT--proBNP	N-terminal pro b-type natriuretic peptide
ACTH	Adrenocorticotropic hormone
[Ca++]U/[Cr]U	(Urine calcium concentration)/(Urine creatinine concentration)
BIA	Bioelectrical impedance
SGLT2	Sodium-glucose co-transporter 2
CRRT	Continuous Renal Replacement therapy
ODS	Osmotic demyelination syndrome