renal tubular acidosis hyperkalemic renal tubular acidosis Renal tubular acidosis (RTA) that is caused by a generalized transport abnormality of the distal tubule. The transport of electrolytes such as sodium, chloride, and potassium that normally occurs in the distal tubule is impaired. This form is distinguished from classical distal RTA and proximal RTA because it results in high levels of potassium in the blood instead of low levels. UMLS:C0376185 MONDO:0100161 type 4 renal tubular acidosis type 4 RTA MEDGEN:87662 hyperkalemic RTA renal tubular acidosis type 4 GARD:0027992 Orphanet:89939