Box 1.
Current ‘clinical’ classification of renal tubular acidosis (RTA)
• Type 1: Distal RTA (most common)—‘complete’ and ‘incomplete’ (hypokalaemia common) |
• Type 2: Proximal RTA |
• Type 3: A poorly characterized mixture of 1 and 2 in infants and which may reflect an ‘immature’ renal tubule |
• Type 4: Hypoaldosteronism (real or apparent)—‘distal-like’ with hyperkalaemia |