What to expect? New born screening

Our son was born just over a month ago and while doing thegenetic newborn screening, they found high IRT levels but no gene or mutation from the basics that they test.

He is gaining weight really well, (average 50g / day) and not really showing any signs. He was born at term and delivery was normal and not stressful.

We are going in for a sweat test this week. Has it happened to anyone that they got a bunch of news that they might have it but finally, it turned out okay?

Thanks.