Hi there momsboy, welcome too Healingwell.
It does happen quite often that there are no other cases of CF in the family. Before I was born, noone in my family had even heard of CF. Then my little borther was born, also with CF. My mum has gone back through family tree as far as she can, and there is no record of CF anywhere. I'm pretty sure this is actually too do with CF not really been recognised and understood. It has been around a long time, but the clinical aspects of it, weren't really recognized until the 1900's.
If they have just found one copy of Df508 and no other gene's, it may be that your son is a carrier of CF. For the gene too actually work properly and effect you, you need 2 copies, one from each parent. Unfortunately they can't yet test for every single gene mutation. Which is why they will be doing the sweat test. The sweat test measures the amount of salt in your sweat. People with CF sweat 100% more salt than a 'normal' person. The test is very accurate.
It would be bad if your son does have CF, it's not a nice illness. But, at least you will know what you're dealing with. Some people don't get diagnosed until later on, and have missed out on years of medication and treatment, that your son will be getting. With treatment advances that there are today, they reckon children now, have a much better chance at leading a normal life.
Keep in touch with how you are doing, and feel free to ask any questions you may have.
Co-moderator in the: Cystic Fibrosis Forums
Diagnosed with: Cystic Fibrosis, Asthma, ABPA, Clinical Depression, Mild Liver Cirrohsis, Mild Osteopenia, Erythema Nodosum. Waiting for final diagnosis on Muscular Dystrophy type symptoms.
Medication: Creon 10,000, Flucloxacillin, Vitamins A,D+E, Serevent, Salbutamol, Paracetamol, Ondansetron, Nefopam, Ursodeoxycholic Acid, Saline neb/PEP system, Mirtazapine,slow-sodium, Skandishake and Fresubin.
Had a Port-a-cath fitted on chest wall since Nov 05