Cystic fibrosis and fast moving haemoglobin [letter].

We have measured fast moving components of haemoglobin (FMH) in nine children 
with cystic fibrosis without any clinical evidence of diabetes mellitus. The 
nine patients with cystic fibrosis had a mean FMH of 9.3 
which differed significantly from 97 controls with a mean FMH of 
7.6. There was no correlation between FMH and age or FMH 
and duration of disease. The above results raise the question as 
to what extent the FMH is a reflection of hyperglycaemia or 
insulinopenia. 