There isn’t a single test that tells you whether you’re infertile. Instead, fertility evaluation is a series of tests for both partners, each one checking a different piece of the puzzle: whether ovulation is happening, whether sperm are healthy, whether the reproductive anatomy is structurally sound, and whether hormones are at the right levels. Most couples start this workup after 12 months of regular unprotected sex without conceiving, or after 6 months if the female partner is 35 or older.
Tests for Ovulation
The first question a fertility workup answers for women is whether you’re ovulating regularly. The most common way to confirm this is a blood test that measures progesterone about seven days before your next expected period (often called a “day 21” test if you have a 28-day cycle). A progesterone level at or above 30 nmol/L is strong evidence that ovulation occurred that cycle, though a lower number doesn’t necessarily mean it didn’t.
At-home ovulation predictor kits, which detect a surge of luteinizing hormone in urine, can give you a preliminary sense of whether you’re ovulating before you ever see a doctor. They’re useful for timing intercourse but aren’t as reliable as blood work for confirming ovulation actually happened after the hormone surge.
Hormone and Ovarian Reserve Testing
Beyond confirming ovulation, blood tests can reveal how many eggs your ovaries likely have left, a concept called ovarian reserve. This matters because a lower reserve can mean fewer options and more urgency in treatment decisions. Two tests work together here.
The first is an AMH (anti-Müllerian hormone) blood test. AMH is produced by the small follicles in your ovaries, so the level in your blood reflects how many eggs remain. An average AMH falls between 1.0 and 3.0 ng/mL. Below 1.0 ng/mL is considered low, and below 0.4 ng/mL is severely low. Unlike most fertility blood work, AMH can be drawn on any day of your cycle.
The second is an antral follicle count, done via transvaginal ultrasound in the first few days of your period. A technician counts the small follicles (2 to 10 mm) visible on both ovaries. A combined count of 10 or fewer is associated with lower pregnancy rates and suggests diminished reserve. Together, AMH and the follicle count give a much clearer picture than either test alone.
Other hormones are typically checked at the same time, including FSH (follicle-stimulating hormone), estradiol, and thyroid hormones. Elevated FSH early in your cycle can signal that the brain is working harder to stimulate the ovaries, another marker of declining reserve. Thyroid problems, even mild ones, can interfere with ovulation and implantation.
Checking Fallopian Tubes and the Uterus
Even if ovulation and hormone levels look normal, a structural problem can prevent pregnancy. The most common test for this is a hysterosalpingogram, or HSG. During the procedure, a small amount of dye is injected through the cervix while X-ray images are taken. The dye outlines the inside of the uterus and shows whether it flows freely through both fallopian tubes, confirming they’re open.
HSG is quite reliable for tube assessment, with about 96% sensitivity and 92% specificity for detecting whether the tubes are open or blocked. It’s less precise for identifying problems inside the uterus itself, such as polyps or fibroids, where sensitivity drops to around 70%. If the HSG raises questions about the uterine cavity, your doctor may follow up with a saline ultrasound or a hysteroscopy, which uses a thin camera inserted through the cervix for a direct look.
The procedure itself takes about 10 to 15 minutes. Most women describe it as moderate cramping similar to a bad period. Some feel little discomfort at all. You can typically go back to normal activities the same day.
Semen Analysis
Male factors contribute to roughly half of all infertility cases, so a semen analysis is one of the first tests ordered. The sample is collected (usually through masturbation at the clinic or at home with a special collection kit) and evaluated in a lab. Three main numbers matter.
- Total sperm count: At least 39 million sperm per ejaculate is considered the lower end of normal.
- Motility: At least 42% of sperm should be moving, since sperm that can’t swim effectively are unlikely to reach the egg.
- Morphology: At least 4% of sperm should have a normal shape. This threshold sounds low, but it’s the standard reference point established by the World Health Organization.
One abnormal result doesn’t always mean there’s a problem. Illness, fever, stress, or even the gap between the last ejaculation and the test can skew results. A repeat analysis two to four weeks later is standard before drawing conclusions.
Advanced Sperm Testing
When a standard semen analysis looks normal but a couple still can’t conceive, or when IVF cycles keep failing, a sperm DNA fragmentation test can dig deeper. This test measures how much of the DNA inside each sperm cell is damaged. A standard semen analysis only looks at count, movement, and shape. It tells you nothing about whether the genetic cargo the sperm carries is intact.
DNA fragmentation testing is particularly useful in a few scenarios: couples with unexplained infertility, recurrent miscarriages, repeated IVF failures, or when the male partner has significant environmental or occupational exposures (chemicals, heat, radiation). High fragmentation can also help identify men who would benefit from varicocele repair, even when their semen analysis numbers look borderline normal. In some cases, high fragmentation leads doctors to recommend using sperm retrieved directly from the testicle rather than from an ejaculated sample, since testicular sperm tends to have less DNA damage.
At-Home Fertility Tests
A growing number of companies sell at-home hormone testing kits, most commonly for AMH. These use a finger-prick blood sample mailed to a lab. The accuracy varies significantly depending on the collection method. One study comparing at-home devices to standard blood draws found that one type of collection device matched clinical lab results 97.5% of the time, with near-perfect correlation. Another device type, however, matched only 85% of the time and had just 57% sensitivity for detecting low ovarian reserve before statistical corrections were applied.
At-home sperm tests also exist, typically measuring count and sometimes motility. They can flag an obvious problem, like a very low sperm count, but they don’t assess morphology or provide the full picture a lab analysis does. These tests are best thought of as a screening step. A normal at-home result doesn’t rule out fertility issues, and an abnormal one needs clinical confirmation.
When All Tests Come Back Normal
After a full workup, somewhere between 15% and 30% of couples receive a diagnosis of unexplained infertility. Every test checked out, yet conception isn’t happening. This is genuinely frustrating, but it doesn’t mean nothing is wrong. It means the standard tests aren’t sensitive enough to catch whatever the issue is. Problems with egg quality, subtle implantation failures, or sperm function issues that don’t show up on a semen analysis can all play a role.
Unexplained infertility isn’t a dead end. Many of these couples respond well to treatment, often starting with ovulation-stimulating medication combined with intrauterine insemination, then moving to IVF if needed. The “unexplained” label simply means the treatment approach is empirical rather than targeted at a specific diagnosis.