Magno
Sex Hormones
Estradiol on TRT
What the number means, why it moves on a protocol, and how it sits with related markers.
What it is
Estradiol (E2) is the estrogen men make from testosterone through aromatase. On TRT it rises with the dose, and it matters for bones, joints, libido and HDL.
The range
How to read the lab range
The lab range is for men making their own testosterone. On TRT some people also look at the ratio of testosterone to estradiol (testosterone in ng/dL divided by E2 in pg/mL). The sensitive LC-MS/MS assay reads more accurately in men than the standard one.
Why it moves on a protocol
- Bigger, less frequent injections aromatize more at the peak.
- Body fat carries aromatase, so leaner men run lower E2 on the same dose.
- Aromatase inhibitors push it down fast, often a long way.
- Alcohol in the days before the draw raises it.
How Magno reads it
Magno keeps every test on one line, against your lab's range, with the change since last time. Pro explains it in plain words. Get Magno for iPhone.
Read yours
Drop your lab PDF or a photo and get every marker explained in plain words. Free, no account, your file never leaves your browser. Track it in the iPhone app to see the change since your last test.
Questions people ask
What estradiol is normal on TRT?
Figures of roughly 20 to 40 pg/mL (75 to 150 pmol/L) are commonly quoted, and some people read the testosterone to estradiol ratio too. Symptoms matter as much as the number; your doctor reads them together.
What are the signs of high or low estradiol?
Water retention, sore nipples and moodiness are the signs people link to high E2; joint ache, flat mood and low libido to low E2. They overlap with other causes, so they are worth raising with your doctor next to the number.
Related markers
Not medical advice
This explains what the number is and why it moves. It is not medical advice; decisions belong to you and your clinician.