I am a worried mom and I need advice. My one year old son has been going through a lot of tests. His hemoglobin levels are low and are to my understanding has nothing to do with iron. He has elevated Fetal hemoglobin levels. He is seeing a hematologist/oncologist to determine if he has bone marrow failure. He has been tested for fanconi anemia and we are still awaiting the results. He has lost a pound in two weeks adn the doctor has said he is failing to thrive, despite his hug appetite, and would to rule out Cystic Fibrosis so they are doing a sweat test on July 1. He has diahrea quite often and coughs a lot, but it is not always with phlem. My question to some of you more experienced parents is this: Can cystic fibrosis affect red blood cell counts? Does anybody know if an elevated fetal hemoglobin can be associated with CF? I am just so exhausted with all the testing and I feel like I have to constantly follow up with the doctors for fear that something may "slip through the cracks".