Type 1 is also called classic distal RTA. (Acid is not secreted) Type 2 is called proximal RTA. (Bicarb is not absorbed) Type 3 is rarely used as a classification today because it is now thought to be a combination of type 1 and type 2. Type 4 RTA is caused by another defect in the distal tubule, but it is different from classic distal RTA and proximal RTA because it results in high levels of potassium in the blood instead of low levels.
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