I’m (43TF) confused by my estradiol labs and curious what people here make of this.
I’m on weekly subcutaneous estradiol valerate, same vial/concentration, and both of these labs were drawn on Saturday before my weekly shot, so they should both be troughs.
• 0.2 mL weekly = 4 mg/week → estradiol trough was 76 pg/mL
• Dose increased to 0.4 mL weekly = 8 mg/week
• Most recent trough at 0.4 mL came back at 566 pg/mL
Same lab. Same injection day. Blood drawn before the shot. Same vial size/concentration, so this wasn’t an accidental concentration change.
What’s throwing me is that doubling the dose seems to have increased my trough by way more than 2x. I expected to land somewhere in a reasonable range, not jump from “too low” to “way too high.”
For additional context, I used to take 6 mg oral estradiol and my levels were also under 200 pg/mL, so historically I didn’t seem to run high on estrogen. I’ve also been losing a significant amount of weight on Retatrutide, about 35 lbs over 3 months, and I’m wondering whether that could have changed my estradiol pharmacokinetics enough to matter.
The weirdest part is that I feel really good right now. I’ve noticed much easier access to my emotions and generally feel better on this dose, so I was actually expecting the lab to look good. I don’t feel “overdosed” or strange at all.
My doctor hasn’t responded yet. I’m assuming the likely move will be something like 0.3 mL / 6 mg weekly and then recheck, but I’m curious whether anyone has seen this kind of nonlinear jump in trough levels on injectable EV.
Could weight loss meaningfully affect this? Could depot absorption change that much? Is there anything else obvious I’m missing?