Mycoplasma and Ureaplasma: What They're Actually Doing to Your Fertility Odds

In my clinical experience, when a woman's bloods come back "normal" but IVF still isn't working, there's almost always something that hasn't been looked at yet. Not always something huge, but just something skipped.

Mycoplasma and Ureaplasma are two of the most common things I see get missed.

This is exactly why I built the Fertility Foundation Framework, because your results deserve more than a "normal" stamp and a shrug.

You've done the diet, the supplements, the lifestyle changes. Both of you are healthier than you've ever been. And you're still sitting here after another failed cycle, no closer to an answer, wondering what everyone else seems to already know that you don't.

Here's one thing worth putting on the list: Mycoplasma and Ureaplasma are small bacteria that live in the genital tract. Loads of people carry them with zero symptoms. The problem is they can sit quietly in the uterine lining or in semen, driving low grade inflammation that never shows up on a standard fertility work up.

Know what the research is actually saying

On the female side, a study in Human Reproduction Open found Ureaplasma in the vaginal microbiome was linked to lower rates of implantation, clinical pregnancy, and live birth in IVF patients. Disordered vaginal microbiota more broadly was linked to higher IVF failure rates too.

A separate study in Fertility and Sterility looked at over 1,500 women with recurrent pregnancy loss and no other identified cause. Every single patient was tested for Mycoplasma and Ureaplasma using endocervical cultures. Anyone who tested positive, along with their partner, got a 14 day course of doxycycline, then a retest to confirm it had actually cleared.

Test, treat, retest. That's the whole point. You don't guess, you check.

It's not just a "her" issue either. A study out of Athens found men whose semen tested positive for Ureaplasma had a slightly lower IVF pregnancy rate, and a much higher miscarriage rate once pregnant, 54% compared to 21%. A larger, more recent study of over 1,200 couples in China found something more nuanced: male Ureaplasma infection affected semen parameters, but its impact on embryo quality and pregnancy rates through IVF was minimal. So it can make natural conception harder, but IVF can work around some of that damage.

Get both partners tested properly

Testing is a PCR or culture swab. Cervical or urethral for you, semen culture for your partner. Most standard fertility panels don't include this automatically, so you may need to ask for it directly. This is exactly the kind of thing I walk clients through in consult, what to test, how to read the results, and what it actually means for your protocol.

Don't stop at the first round of antibiotics

Medically, antibiotics are the recommended treatment, but they only clear the infection in 30 to 40% of cases. That means there's a real chance it's still there when you go into your next IVF cycle or try to conceive naturally. Retesting after treatment isn't optional, it's the step that tells you whether you've actually solved the problem or just assumed you did. This full process, testing, treatment, and retesting, is part of what I'm building into the course I'm developing to help women get this right the first time.

Three things worth checking that most women are never told to

One, whether Mycoplasma and Ureaplasma have ever actually been tested for, not assumed clear because nothing showed up on a standard panel. Two, whether your partner has been tested alongside you, since this is very much a two person issue. Three, whether a retest happened after treatment, because a course of antibiotics without confirmation is a guess dressed up as a solution.

Where I'll be straight with you: we don't fully know yet. A 2022 systematic review pulling together the existing studies on Mycoplasma and Ureaplasma in pregnancy concluded the evidence isn't strong enough yet to say for certain how much these bacteria drive adverse outcomes, on their own or alongside bacterial vaginosis. That's not me hedging, that's the actual state of the science right now. What we do know is that when these bugs are present and inflammation is part of your picture, treating them has a plausible upside and very little downside. That's reason enough to test.

If you've had unexplained IVF failure, recurrent loss, or preterm birth and this hasn't been checked, it's worth putting on the list.

Let's get you pregnant!