I'm sure you are very worried about your son but if it were one of my kids I would let them continue too. My mom has had a heart murmur her entire life and she is 79 yrs old. The echo will be able to tell you more. It just stinks that you need to wait for almost 2 weeks. Maybe if you call them they will be able to put you on a "will call" list if someone cancels. I did that with a test and they called the same day.
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