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Do temperatures or T4 test doses have to be taken to the minute like the T3?

Do temperatures or T4 test doses have to be taken to the minute like the T3?

No.
Temperatures should be taken about every 3 hours, 3 times a day, starting about 3 hours after waking, but the timing is not critical. Likewise, the T4 test doses are taken only as needed according to the clinical situation, and exact timing is not critical. Some people may find that they need a T4 test dose about every 3 days, but that T4 wouldn’t have to be taken every 72 hours precisely.