Transtubular K Gradient

Serum K

mmol/L

Serum Osmolality

mosm/kg

Urine K

mmol/L

Urine Osmolality

mosm/kg

TTKG

Formula

Grad = (K_urine*Osm_serum)/(Osm_urine*K_serum)

Info

References:
Ethier JH. Am J Kidney Dis 1990 Apr;15(4):309-15. -> PubMed