The simplest starting point is tracking whether you ovulate each month, but a full picture of fertility requires specific blood tests, a semen analysis, and sometimes imaging of the reproductive organs. Infertility is formally defined as not conceiving after one year of regular, unprotected sex, or six months if you’re over 35. You don’t need to wait that long to start gathering information, though. Several signs, tests, and screenings can give you a clearer sense of where things stand.
Signs Worth Paying Attention To
Before any lab work, your own body offers clues. RESOLVE, the national infertility association, recommends asking yourself a few pointed questions: Are your periods painful? Can you identify when you ovulate? Have you had more than one miscarriage? Is your BMI significantly above or below a healthy range? Have you or your partner ever had a sexually transmitted infection? Answering yes to any of these is reason enough to talk with a provider, regardless of how long you’ve been trying.
Certain patterns in your menstrual cycle also raise flags. Cycles shorter than 24 days or longer than 35 days, periods that last more than six days, very heavy bleeding, or cycles that are unpredictable from month to month can all point to a hormonal imbalance. These are hallmarks of conditions like polycystic ovary syndrome (PCOS), which is one of the most common causes of ovulatory infertility. Excessive facial hair or acne on your face, chest, or abdomen can accompany that hormonal picture.
Endometriosis is another condition closely linked to fertility problems, and it tends to run in families. The telltale symptoms include menstrual cramps that worsen over time, extremely heavy flow, painful bowel movements around your period, and pain during sex. If your mother or sisters had similar symptoms or were diagnosed, that family history matters.
Tracking Ovulation at Home
The most accessible first step is confirming that you actually release an egg each cycle. Ovulation predictor kits (OPKs) detect a surge in luteinizing hormone (LH) in your urine, which typically happens about 24 to 36 hours before ovulation. These strips are inexpensive, widely available, and reasonably reliable. In a study comparing different LH testing methods, strips detected the surge in 82% to 95% of cycles, and results correlated almost perfectly with more advanced fertility monitors.
You’ll start testing a few days before you expect to ovulate (usually around day 10 of a 28-day cycle) and test daily until you see the surge. If you consistently test through multiple cycles and never detect a surge, that’s a meaningful finding to bring to a doctor. It doesn’t guarantee a problem, but it suggests ovulation may not be happening regularly.
Basal body temperature (BBT) tracking is another option. Your resting temperature rises slightly after ovulation, so charting it each morning before getting out of bed can confirm that ovulation occurred. The catch is that it only tells you after the fact, and it’s easy to get inconsistent readings from poor sleep, illness, or simply forgetting to check at the same time. BBT is more useful as a pattern over several months than as a one-cycle snapshot.
Blood Tests for Female Fertility
If you move to clinical testing, your doctor will likely start with blood work timed to specific days in your cycle. The most common panel is drawn on day 3 of your period (counting from the first day of menstrual bleeding) and includes two key hormones.
Follicle-stimulating hormone (FSH) is a gauge of ovarian reserve, meaning how many eggs your ovaries still have available. A day 3 level under 6 mIU/mL is considered excellent, 6 to 9 is good, 9 to 10 is fair, and anything above 10 suggests diminished reserve. The higher your FSH, the harder your brain is working to stimulate your ovaries, which signals that fewer eggs are responding.
Estradiol is tested on the same day. Normal day 3 levels fall between 25 and 75 pg/mL, with lower values in that range generally being more favorable. An abnormally high reading on day 3 can indicate diminished ovarian reserve or a functional cyst.
Anti-Müllerian hormone (AMH) is another common ovarian reserve marker. Unlike FSH and estradiol, AMH can be drawn on any day of your cycle, which makes it convenient. It reflects the pool of developing follicles in your ovaries. Low AMH suggests a smaller egg supply, while very high levels can be associated with PCOS.
Later in your cycle, around day 21, your doctor may check progesterone. This hormone rises after ovulation, so a mid-cycle progesterone level confirms whether you actually released an egg that month. If progesterone is low, it’s evidence that ovulation didn’t occur or wasn’t strong enough to support a pregnancy.
Testing for Male Fertility
Male factors contribute to roughly half of all infertility cases, so testing both partners is essential. The cornerstone is a semen analysis, which evaluates several characteristics of a sperm sample. Normal values include a sperm concentration of 20 million or more per milliliter, at least 40% of sperm moving (motility), and at least 4% with a normal shape (morphology).
One important detail: sperm parameters fluctuate significantly from one sample to the next. Illness, stress, heat exposure, and even the time since your last ejaculation can all affect results. Current guidelines recommend at least two semen analyses performed about a month apart, especially if the first shows abnormal numbers. A single bad result isn’t a diagnosis.
If the analysis reveals no sperm at all (azoospermia), further workup typically includes a physical exam, semen volume and pH measurements, and an FSH blood test. These help determine whether the issue is a blockage in the reproductive tract or a problem with sperm production itself.
At-Home Sperm Tests
Several over-the-counter sperm test kits are now available, and they’re not inaccurate for what they measure. The problem is what they leave out. Most home kits check only sperm concentration. A lab analysis evaluates concentration, motility, morphology, volume, pH, and vitality, all examined under a microscope and by computer. As Cleveland Clinic specialists put it, home test results are only a fraction of what a formal analysis reports. Even if your at-home results look normal, you could still have a male-factor issue that the kit can’t detect. These tests are reasonable as a first look, but they don’t replace clinical testing.
Imaging and Structural Tests
Blood work and semen analysis check the hormonal and cellular side of fertility. Imaging tests look at the physical structures involved. For women, the main question is whether the fallopian tubes are open and the uterine cavity is clear of fibroids, polyps, or scar tissue that could interfere with implantation.
A hysterosalpingogram (HSG) is the most common procedure for this. A doctor injects dye through the cervix while taking X-rays, following the dye as it passes through the uterus, into the fallopian tubes, and (ideally) spills out the other end. If the dye flows freely, the tubes are open. If it stops, there may be a blockage. The procedure takes about 15 to 30 minutes and can cause cramping similar to period pain.
A sonohysterogram uses saline and ultrasound instead of dye and X-rays. Saline is injected into the uterus to expand it, giving a clear ultrasound view of the interior lining. If tube evaluation is also needed, tiny bubbles are injected through the catheter to see whether they pass through and out the ends of the tubes. This approach avoids radiation and can give a detailed look at uterine abnormalities.
Both procedures are done in-office and don’t require anesthesia, though your doctor may recommend taking an over-the-counter pain reliever beforehand.
When to Start Testing
The standard recommendation is to seek an evaluation after 12 months of trying if you’re under 35, or after 6 months if you’re 35 or older. If you’re over 40, the guidance is to begin an evaluation right away rather than waiting. These timelines exist because about 85% of couples conceive within a year of trying, so testing before that point often catches people who simply haven’t had enough cycles yet.
That said, the timelines assume nothing else is going on. If you have irregular periods, a known condition like PCOS or endometriosis, a history of pelvic infections, or prior cancer treatment, there’s no reason to wait out the clock. The same applies if your partner has a known history of testicular injury, undescended testicles, or prior chemotherapy. Starting the conversation with a provider earlier means catching treatable issues sooner, and many of the initial tests are straightforward blood draws and ultrasounds that carry minimal risk.