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On 09/26/07, his T4 was 7.6 and TSH was 3.509, which were normal.
or On 09/26/07, his T4 was 7.6 and TSH was 3.509, which are normal.
"are normal," or "are both normal." You're referring to the normal range of these blood tests, and even though his results are in the past, the safe or normal range is still current.