McCall McPhersonFounder, Modern Thyroid Clinic.

Thyroid Health Pre-Pregnancy: Key Hormone Levels Explained

13 Jan 2025 · 1 min

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This content was created by McCall McPherson. This content was uploaded by McCall McPherson. This is a YouTube video titled "Thyroid Health Pre-Pregnancy: Key Hormone Levels Explained" (created 2025-01-13) featuring McCall McPherson. The excerpt is an educational/medical segment in which McCall outlines target thyroid hormone ranges for pre-pregnancy (TSH close to 1 and well below 1.8; free T4 ~1.0–1.2; T3 ~3.6–4.2; reverse T3 pre-pregnancy ~8–12, up to 15) and explains that reverse T3 commonly rises (into the high 20s–30s) during pregnancy as a normal physiological response and typically is not treated.

Questions this video answers

Close to 1, can be a little less or more than 1, should be well below 1.8.

Between 1.0 and 1.2.

Between 3.6 and 4.2 throughout the bulk of the day.

8 to 12, could be up to 15.

It commonly increases into the high 20s–30s and is a normal physiological response; it is typically not treated.

Chapters

Pre pregnancy I want TSH close to 1, can be a little less than 1, can be a little more than 1, well below 1.8. Okay. And that's also what the study verified. T4 I want between 1 and 1.2 which is a little more narrow margin. T3 I want between 3.6 and 4.2 throughout the bulk of your day. Reverse T3 pre pregnancy planning I want 8 to 12 it could be up to 15. However during pregnancy y' all reverse T3 will increase. It is a normal physiological response. Your body is trying to you lay down, rest and recover. So it is very common almost always to see reverse T3s in the high 20s, 30s, whereas comparatively I see reverse T3 in the 30s maybe one to two times a month in non pregnant people. So if that gives you a little perspective, we do not treat an elevated reverse T3 during pregnancy because again it is expected and a normal physiological response can.