TSH and 54?

My ESL speaker is stating this as a sentence:

Her CMP, TSH and 54 as well a 24-hour Holter monitor.

The part in question is the 54. At least it s/l he is saying 54.

Can a 54 fit in anywhere?

Thanks for any help! You all are great help on this site!

• TSH and 54? - Ozarkmtmama
  • free T4 - could this be it?
    • free T-4 is correct! - Ozarkmtmama
  • TSH and T4 - MT50
    • TSH, T3, T4? - Ozarkmtmama
      • From your mouth to God's ears! - MT50

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