Chance15 Dose increases are generally in 25mcg increments, and as your mom has heart problems then it is very sensible in her case.
She still has a long way to go to get TSH within range so make sure she has a re-test 6-8 weeks after each increase to check her levels, I imagine she will need a few more increases and it will take a few months to get her levels where they should be.
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