When it comes to conversion
factors, it seems that the one used most often is one grain
for each 100 mcg of T4. It all depends on what the assumption is for the effect of T3, compared to T4. There s another conversion factor I have seen that used 75 mcg of t4 for each grain
In either case, your 1 1/2 grain
s of armour
is slightly higher than just a straight substitution. So, it appears your doctor also increased your dosage.