The inbreeding coefficient is calculated with Wright's equation
Fx=Sum[(½)n1+n2+1(1+Fa)]
The inbreeding coefficient is the probabillity that for any given gene both alleles come from the same ancestor.
IC of 0-10 is low IC of 10-20 is medium IC 20+ is high
There is no direct relation between the genetic health and the IC.
In other words an animal with a low IC is not per definition genetically healthier then an animal with a high IC.