u/ThesisTears

After years of aggressive blood donations and decades of a vegetarian diet, my ferritin fell to 11. Due to my weight loss efforts and extreme calorie deficits, I really struggled to get enough iron and started losing a lot of hair. I started taking iron more consistently and only saw a small increase, so I went for an iron infusion that nearly killed me (I had a rare severe hypersensitivity reaction). I thought that would make a difference as I did get most of the bag in, but tragically my ferritin is back down to 34, which is even lower than my measurement last February.

My GP wants to prescribe another infusion using a different formula over a longer time period. Still there's a good chance I could have another reaction, which obviously wouldn't be safe for a fetus. Now I'm debating whether or not to postpone another month.

This would be the second time we pushed things back (the first time I decided I wanted to get my BMI on the lower end of overweight instead of the higher end to help with my PCOS). It just doesn't feel fair. I'm turning 30 in a couple months and I feel like every missed cycle could mean the difference between having kids or not, since I truly don't know my fertility picture (have never been pregnant, on hormonal birth control since 14 years old).

I guess I'm wondering what you folks would do in my situation? I'm on day 9 of my cycle which means I'll probably be ovulating around the 14th (but I couldn't say because I don't know my cycle length). Should we just sit this one out or risk a massive inflammation event shortly after possible conception? Is the worst that could happen just no implantation? How vulnerable is a blastocyst to systemic inflammation if my body doesn't take well to the infusion again? Thank you for any feedback/advice you can offer.

reddit.com
u/ThesisTears — 6 days ago
▲ 2 r/u_ThesisTears+1 crossposts

I found out I had low ferritin when I went to donate blood in early 2025 and got a letter banning me for a year because I measured at 11. Since then I've been supplementing with Ferrimax and my ferritin has slowly creeped up. I had an iron infusion which almost killed me but I got almost one full bag of iron sucrose out of the three prescribed. Tell me why my ferritin has HALVED since my last blood test!?

Timeline:

May 21 2025: ferritin 18

(Months of inconsistent supplementation)

Nov 19 2025: ferritin 26

(Started supplementing more consistently)

Feb 9 2025: ferritin 41

Feb 27 2025: iron infusion that nearly killed me

Apr 7 2025: ferritin 73 (maybe because of residual infusion iron?)

(rigorous supplementation)

May 5 2025: ferritin 34!?!?!?

Is this a fluke!? I've only had one period (I intentionally skipped most of them with hormonal birth control) since my Feb 9th test and it was last week. My husband and I just started TTC and the last time I had an iron infusion I had a severe hypersensitivity reaction that landed me in the ER so it's not like I can easily do that again, and certainly not while pregnant.

What can cause someone's iron to plummet so severely despite me taking my supplements so consistently!? Yes I already have a doctor's appointment scheduled, I just want to know if anyone else has experienced this or if someone can hypothesize as to what could be going on. I really really don't want to delay our conception planning for this.

EDIT: I should mention that I'm vegetarian and was intentionally on a calorie deficit for the past two years (where I wasn't getting enough dietary iron until very recently), but I haven't donated blood since early 2025. Up until I started my weight loss journey and frequent blood donations I never struggled with anemia.

reddit.com
u/ThesisTears — 7 days ago