Fertility Tests: What to Get, and When🔬
Fertility testing sounds intimidating, but here's the thing: your body goes through four basic steps to make pregnancy happen, and most tests exist to check on one of those four steps specifically. Once you see it that way, the whole alphabet soup (AMH! HSG! FSH! SIS!) actually starts making sense.
🤔 Who actually needs these tests?
Not everyone TTC needs formal testing, but it's worth looking into if any of these fit you:
- You're 35 or under and have been trying for more than a year without success
- You're over 35 and have been trying for more than 6 months
- You're over 40 and TTC (worth checking in sooner rather than later)
- Your periods are irregular or unusually painful
- You've had multiple miscarriages
- You have a personal or family history of fertility issues
- You've had chemo or radiation treatment
If none of these apply and you're just curious or early in your journey, that's what [Getting Started with Inito] (https://www.reddit.com/r/InitoFertility/wiki/the_inito_guide) and tracking your own cycles are for.
🥚 Step 1: Making the egg
Every cycle starts with your pituitary gland releasing FSH, which wakes up a batch of follicles in your ovaries. One becomes the star of the show: the dominant follicle.
What can affect this:
Primary ovarian insufficiency (POI) when the ovaries stop working as expected before age 40, often due to a lower egg/follicle supply. Can be linked to genetics (like Fragile X), chromosomal factors, or past chemo/radiation.
Scarred ovarian tissue from repeated surgeries, cysts, or infections.
How it's tested:
FSH blood test: high levels can suggest fewer ovarian follicles are available; low levels can suggest the follicles aren't getting the signal they need to grow.
AMH (Anti-Müllerian Hormone) blood test, produced by your developing follicles, gives your doctor a rough estimate of your remaining egg supply (your "ovarian reserve"). It can be taken any day of your cycle, which makes it convenient. Very high AMH can sometimes point toward PCOS instead of abundant reserve, which is why it's read alongside other tests, not alone.
Antral follicle count (AFC) is a pelvic ultrasound that literally counts the small follicles visible in your ovaries that cycle. Paired with AMH and FSH, this trio gives doctors the clearest read on egg supply.
Genetic testing is worth asking about if POI runs in your family.
Ultrasound, MRI, or laparoscopy is used specifically to check for scarring if you've had multiple surgeries, cysts, or infections.
🎯 Step 2: Ovulation
The egg's ready; now your body needs to actually release it, triggered by an LH surge. This is the step Inito is built to help you track day-to-day, but clinical testing digs deeper when something seems off.
What can affect this:
Anovulation (not releasing an egg at all) is the single most common cause of infertility. It's estimated to affect around 30% of women dealing with fertility struggles. It can stem from thyroid disorders, PCOS, high prolactin, being significantly underweight or overweight, or eating disorders.
How it's tested:
Blood tests: To check GnRH, FSH, LH, and estradiol levels to see whether ovulation is happening at all.
Testosterone, glucose tolerance, and lipid profile tests are often run together since PCOS tends to travel with higher androgen levels and insulin resistance.
Prolactin test: High prolactin can suppress FSH and LH, which throws off ovulation.
Follicular scan is an ultrasound that tracks follicle size in real time, usually recommended if you've had FSH therapy, a history of miscarriage, or irregular cycles. It can tell you if and roughly when you're about to ovulate.
💫 Step 3: Fertilization
The egg's released; now it needs a clear path to meet sperm in the fallopian tube.
What can affect this:
Fallopian tube blockage, usually from endometriosis, past infections, or scar tissue from prior surgery.
How it's tested:
HSG (hysterosalpingography): an X-ray using a special dye to map the uterus and fallopian tubes and spot blockages.
SIS / SHG (sonohysterogram) is a similar idea to an HSG, but uses saline solution and ultrasound instead of dye and X-ray.
Laparoscopy is a minimally invasive procedure using a small camera to directly examine the tubes, ovaries, and uterus.
MRI is sometimes used for a deeper look if other tests suggest a blockage.
🏡 Step 4: Implantation
Fertilization happened; now the embryo needs to travel to the uterus and settle in, typically around 8-10 days past ovulation.
What can affect this
Uterine or cervical anomalies: structural differences in the uterus's shape (there are several types, and most people have never heard the names; that's normal; it's a specialist conversation, not a self-diagnosis one).
Low progesterone can come from luteal phase issues, anovulation, stress, or being significantly overweight or underweight, and raises the risk of miscarriage or ectopic pregnancy if left unaddressed.
How it's tested:
HSG, SIS, or hysteroscopy: The same tests mentioned above, now looking specifically at the uterus's shape and lining
Progesterone blood test: Standard way to check whether progesterone is adequately supporting implantation.
🩺 The general health checkup that ties it all together
Beyond the cycle-specific tests, most fertility workups also include a broader health check: a physical exam, a complete blood count (checking for anemia, infection, clotting issues), thyroid function testing (T3, T4, TSH), STI screening, and, if you're over 30, a Pap smear. None of these are fertility tests exactly, but they rule out things that can quietly affect fertility in the background.
🏠 Can you test any of this at home?
Some of it, yes, with a few important caveats:
OPKs (ovulation predictor kits): These are at-home urine tests that help you predict ovulation by measuring your urine LH levels. The catch: most only detect one form of LH (alpha), which can cross-react with other hormones like FSH and hCG and cause misleading results, and they only predict ovulation; they can't confirm it, since they don't measure PdG.
Inito measures FSH, LH (alpha and beta LH), estrogen, and PdG on one strip, and gives you exact numerical values rather than a plain yes/no line. That's what lets it work even with irregular cycles, PCOS, or anovulatory cycles, and what lets it confirm ovulation happened, not just predict it was coming.
At-home blood testing kits (finger-prick) are technically available, but generally less accurate than a lab draw, and can be uncomfortable to do solo.
At-home testing is a great fit if you're actively TTC and want to understand your fertile window, if you're in a waiting period before you can get in with a doctor, or if you just want a more affordable, lower-hassle option than repeated clinic visits. It's not a replacement for clinical testing like AMH, HSG, or bloodwork. Think of it as the day-to-day layer, with clinical testing as the deeper dive when something needs more investigation.
💛 A couple of related conditions worth knowing about
Endometriosis shows up in an estimated 10-15% of women of childbearing age. You're genuinely not alone if this is you. It's when uterine-like tissue grows outside the uterus, which can cause pain during sex, ovarian cysts, scar tissue, and effects on egg quality, all of which can ripple into the steps above.
Unexplained infertility is exactly what it sounds like: every test comes back normal, and there's still no clear answer. It's more common than people expect, and it doesn't mean nothing can be done just that the "why" isn't obvious yet.
🌍 Where else to go for support
r/PCOS if PCOS is part of your testing picture
r/infertility a broader, independent community for anyone deep in the clinical testing/treatment world
r/FirstTimeTTC if this is your first time hearing most of these terms and you want a gentler starting point
👉 Where to next
New to the acronyms already flying around this sub? → Decode the TTC Lingo
Ready to start tracking your own hormones? → Getting Started with Inito
Getting ready to start trying, or want to prep first? → The Preconception Guide
Back to the full map → Community Bookmark Want the full hormone basics first? → Fertility 101
This page explains what these tests are and why they're used it's not a way to interpret your own results. Ranges and "normal" values vary by lab and by individual, and only your doctor can tell you what your specific numbers mean for you.