With antibodies such as TPOab and TGab, the ranges vary wildly.
With a result of 42 and a range of 0-50, you could divide by 50, and read it as 0.84 in a range of 0-1. And that is what some labs do - they scale it to a convenient number.
As SeasideSusie says you are negative for Hashimotos as you are within the laboratory range. As you are high in range it would be worth re-testing in 5 or 6 months time to find out if still the same or any change.
Definitely worth a retest, as this is a test that can have false negatives - antibodies rise and fall, so they may have got you on a low antibody day and you may get a different result on a retest.
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