My son is 5. Back in the spring he started making this really loud noise, a cross between a throat clear and a cough. It lasted a couple months, got better. Then this summer, it came back. Somedays are worse than others. We tried allergy meds (Flonase and Claritin) and it didn't get any better. We were back to the doctor who listened to his chest and said that she could hear a definite wheeze. She's given us the blue puffer to use when he's in a bad spell, and wants us using the peak flow meter to check before/after numbers, tracking how often he needs it etc. For his age/size, his "norm" would be 145, his best is 170 that he's blown. Based on that, he is often down in the yellow. At those times I'll give him the puffer and it definitely brings him back up into green. However, sometimes when he's having those "spells" his numbers are in the green. So can you have asthma, and still at times be blowing normal numbers?