You typed "OHSS rate" into a search bar with a donor contract open in another tab.
The first result said under 2 percent.
The tenth said one in three.
Nobody in the clinic office is going to explain that gap before you sign.
The Search That Started This
One page cites ASRM, saying severe OHSS happens in 1 to 2 percent of cycles.
Another cites HFEA, saying about a third of donors get mild OHSS.
A third is a forum thread full of women swearing the real number is closer to one in three.
A fourth is a small researcher's survey where 15 donors reported moderate-to-severe symptoms.
None of these pages agree, and none tell you which one describes you.
That's the 38-point gap.
It isn't a typo or bad math.
It's four different questions wearing the same three letters.
What "Under 2 Percent" Actually Measures
That figure is a severe-OHSS rate, counted per cycle.
It does not include mild symptoms, moderate symptoms, or anything short of hospitalization-level severe.
It resets every cycle, as if your body forgets what happened last time.
A donor who went through two cycles isn't one data point in that number.
She's two, and clinics rarely say that out loud.
When a nurse says "under 2 percent" during counseling, she's answering a narrow clinical question.
You were asking a much bigger one: what happens to me.
What "One In Three" Actually Measures
HFEA's own figure says about a third of donors experience mild OHSS.
Forums that report "one in three" are often talking about that same territory, not the severe cases ASRM tracks.
Bloating, weight gain, days lost to pain, that's the one in three.
One donor described her stomach as looking "five months pregnant," with pain on touch.
Another said her abdomen got "the size of a basketball" and she could barely eat.
Neither of those women needed the ICU.
Both needed someone to have told them this was possible.
Why Both Numbers Can Be True At Once
The clinic isn't lying when it says under 2 percent.
The forum isn't lying when it says one in three.
They're measuring different things and calling both of them "OHSS rate."
A skeptical reader might say both sides are technically correct and just talking past each other.
That reader is right, and that's the problem.
Nobody is required to reconcile severe-per-cycle with mild-per-donor before you sign anything.
The Word "Rare" Doing A Lot Of Work
"Rare" is doing the job a real number should be doing.
It's simplification dressed up as reassurance.
One donor was told by a doctor, after a severe reaction, that what happened to her was "uncommon."
That word didn't change what her body went through.
It changed how seriously anyone treated it afterward.
If a clinic can call a documented, describable event "rare," it can call almost anything rare.
That's not a statistic.
That's a tone.
When The Average Isn't Your Number
A donor with 53 eggs retrieved ended up in a medical coma in the ICU for four days.
A donor with 63 eggs only learned that number after severe symptoms had already started.
A donor with 43 eggs needed the ER the very next day.
Egg yield isn't a footnote here, it's a variable that changes personal risk.
Young ovarian reserve, PCOS, prior response, none of these show up in a generalized population percentage.
A first-time donor trying to vet her real risk deserves a number tied to her profile, not a national average.
Right now, almost nobody offers that.
The Escalating Dose Nobody Flags
A smooth first cycle gets read as proof the body "handled it well."
That reading is common, and it's often wrong.
A repeat donor's dose can go up for cycle two without a clear explanation of why.
One donor's easy first cycle was followed by a second that was far more dangerous.
Another survived two life-threatening cycles and called herself "extremely goddamn lucky" to have made it through both.
If your dose changes and nobody tells you what that means for risk, that's not a technicality.
That's the exact moment informed consent stops being informed.
Where "Wait It Out" Stops Being Reasonable
Symptoms often don't show up right after retrieval.
They show up two or three days later, once you think you're clear.
One donor described bubbles she could feel around her collarbone, and trouble breathing.
Another developed chest pain, fluid on the lungs, and needed the ER the day after retrieval.
"Drink water and take painkillers" is standard advice for standard bloating.
It is not standard advice for shortness of breath, or a stomach that won't stop swelling.
The line between those two things is exactly what most intake counseling skips.
Who Pays When It Stops Being Small
A donor cleared to fly home while severely ill later suffered a stroke, and spent 10 days hospitalized.
Another was hospitalized for a full month, and became so weak she "forgot how to walk."
Nobody at intake walks you through what happens financially if that's your cycle.
A donor blindsided mid-recovery might worry that going to the ER and hearing "it's nothing" will feel humiliating, and expensive on top of it.
That fear is rational.
It's exactly why the coverage question belongs in the contract, not discovered afterward in a hospital billing office.
What Solidarity Actually Looks Like
Forums exist because clinical counseling left a gap, not because donors enjoy comparing symptoms.
We Are Egg Donors and groups like it fill in what intake packets don't say.
A nurse who was also a donor called her own OHSS experience "terrifying" and "near-fatal," despite having heard the same reassurances she later gave patients.
That's someone on both sides of the counter telling you the script doesn't match the reality.
Community-sourced information isn't a replacement for medical care.
It's the sanity check nobody else is offering.
Will Speaking Up Actually Change Anything
The honest answer: not on its own, and not fast.
The next intake packet may still say "under 2 percent" and stop there.
But every donor who asks for the denominator, the severity breakdown, or her own profile-specific number makes that stopping point harder to defend.
Your story mattering doesn't require a policy change tomorrow.
It requires the next woman searching "OHSS rate" to find your account next to the clinic's.
That's already happening, one forum thread at a time.
Before You Sign Anything
Ask which number your clinic is quoting, and what it excludes.
Ask whether it's per cycle or per donor.
Ask what your specific profile does to that number.
Ask what symptom should send you to the ER instead of the phone.
Ask who pays if it does.
None of these questions are paranoid.
They're the informed consent you were supposed to get before the first appointment ever happened.