You will know that one of your mutations or differences from the RSRS is a heteroplasmy by its letter codes.

Symbol Meaning Symbol Meaning
U U (Uracil) S C or G
M A or C Y C or T
R A or G K G or T
W A or T V A or C or G
H A or C or T B C or G or T
D A or G or T X G or A or T or C
N G or A or T or C

Like other types of mitochondrial DNA (mtDNA) mutations, heteroplasmy is written with the original value, the location of the mutation, and the new (mutated) value. For example, a heteroplasmy at position 73 where the heteroplasmic values are A or G is written as G73R.