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Hi Terri Sue,
I had a doctor friend from church explain the TSH numbers. According to him, it is when this number is HIGH, that it indicates we may need more synthroid. It is thyrroid stimulating hormone so when it is normal, it indicates that we have enough hormone. My doctor uses the TSH and the T4 each time I have blood drawn. This last time, my T4 was low and my TSH was high, so that justified an increase. Sorry, I do not know what LATS is, though. Take care. Debbie