C C128110 Nephrotic Syndrome - Infrequently Relapsing Nephrotic Syndrome - Infrequently Relapsing Nephrotic syndrome in which there is a relapse occurring less than twice in the first six months, or less than four times in a year. Nephrotic syndrome in which there is a relapse occurring less than twice in the first six months, or less than four times in a year. C34845 Nephrotic Syndrome C123272 Pediatric Nephrology Terminology