Fertility Testing: Your Complete Guide to Understanding Your Reproductive Health

Understanding your fertility is one of the most empowering steps you can take on the path to parenthood. Whether you're just beginning to think about starting a family, have been trying to conceive for several months without success, or simply want to understand your reproductive timeline, fertility testing provides concrete, actionable information that can guide your next steps.

This comprehensive guide covers the full spectrum of fertility testing available for both women and men — what each test measures, what the results mean, when to get tested, and how to prepare. Knowledge is the foundation of informed decisions.

Female Fertility Tests: The Essential Panel

A baseline fertility assessment for women typically involves several blood tests and an ultrasound, ideally coordinated across specific days of the menstrual cycle. Together, they paint a picture of ovarian reserve, hormonal function, and pelvic anatomy.

Day 3 FSH (Follicle-Stimulating Hormone): FSH is released by the pituitary gland to stimulate the development of ovarian follicles. It is measured on Day 2 or 3 of the menstrual cycle, when it should be at its basal level. As ovarian reserve declines with age, the pituitary compensates by releasing more FSH to stimulate the remaining (less responsive) follicles. A rising FSH is therefore a sign of declining ovarian reserve. Normal range: <10 IU/L (labs vary); FSH >15 IU/L suggests significantly reduced reserve; FSH >25 IU/L is consistent with ovarian insufficiency or failure.

Day 3 LH (Luteinizing Hormone): LH is often tested alongside FSH. Elevated LH on Day 3, or an LH:FSH ratio greater than 2:1, can indicate PCOS, even in women with regular cycles. A normal LH on Day 3 is typically less than 7 IU/L.

Estradiol (E2): Measured alongside FSH and LH on Day 2–3. Elevated estradiol early in the cycle can suppress FSH, causing a falsely reassuring (normal) FSH result in a woman with reduced reserve. Day 3 estradiol >80 pmol/L (or >20–30 pg/mL depending on assay) warrants careful interpretation of FSH results.

Progesterone (Day 21 or mid-luteal): Measured approximately 7 days after ovulation (in a 28-day cycle, this is around Day 21; in longer cycles, it should be timed to approximately 7 days before the expected period). A progesterone level >16–30 nmol/L (5–10 ng/mL) is generally consistent with ovulation having occurred. Low levels suggest anovulation or a luteal phase defect.

Prolactin: Elevated prolactin (hyperprolactinemia) suppresses GnRH, LH, and FSH — directly impairing ovulation. It can be caused by a pituitary adenoma, hypothyroidism, stress, or certain medications. If elevated on initial testing, it should be repeated under standardized conditions (fasting, no breast stimulation before the test, drawn mid-morning).

Thyroid function (TSH, FT4, TPO antibodies): Thyroid dysfunction — both hypothyroidism and hyperthyroidism — impairs fertility. Autoimmune thyroiditis (Hashimoto's disease) is associated with a 2–3x increased risk of miscarriage and is common in women of reproductive age. TSH should ideally be below 2.5 mIU/L in women trying to conceive; many reproductive endocrinologists recommend treatment when TSH exceeds 2.5 mIU/L in the periconceptional period.

Transvaginal ultrasound (TVUS) for antral follicle count (AFC): Performed in the early follicular phase (Days 2–5), this ultrasound counts the number of small resting follicles (2–10 mm) visible in both ovaries. AFC is one of the best predictors of ovarian response to stimulation (and, to a lesser extent, of remaining ovarian reserve). Normal AFC varies by age but is typically 10–20 total follicles in women under 35. AFC below 7–10 suggests reduced reserve; AFC above 20 raises concern for PCOS and high response risk.

Understanding AMH: What Your Ovarian Reserve Number Means

Anti-Müllerian hormone (AMH) has become the most widely used — and most misunderstood — fertility test of the past decade. Understanding what it actually measures, and what it doesn't, is essential.

What AMH measures: AMH is produced by the granulosa cells of small antral follicles in the ovary. Because AMH production is proportional to the number of these small follicles, it serves as a proxy for the size of the remaining follicle pool — known as ovarian reserve. Unlike FSH, AMH does not fluctuate significantly across the menstrual cycle, meaning it can be measured on any day.

Age-related reference ranges: AMH declines with age as the follicle pool depletes. Approximate age-related median values:

• Age 25–30: approximately 3.0–4.0 ng/mL (21–29 pmol/L)
• Age 30–35: approximately 2.0–3.0 ng/mL (14–21 pmol/L)
• Age 35–40: approximately 1.0–2.0 ng/mL (7–14 pmol/L)
• Age 40–45: approximately 0.5–1.0 ng/mL (3.5–7 pmol/L)
• Low reserve (any age): below 1.0 ng/mL (7 pmol/L)
• Very low reserve: below 0.5 ng/mL (3.5 pmol/L)

It is critically important to note that AMH — while highly valuable for predicting ovarian response to IVF stimulation — is a poor predictor of natural fertility in younger women. A landmark study in JAMA (2017) by Steiner et al. found that among women aged 30–44 without a history of infertility, low AMH was not associated with a reduced chance of natural conception compared to those with normal AMH. This means that a low AMH in a woman who is naturally cycling and trying to conceive does not necessarily mean conception is impossible — it primarily signals that fewer eggs remain, and that the window for conception (and for fertility treatment) may be shorter.

What AMH tells you: How many eggs you have in reserve and how likely you are to respond well to IVF stimulation.

What AMH does NOT tell you: The quality of those eggs, whether ovulation is occurring, or your precise probability of conceiving naturally in any given month.

Male Fertility Testing: The Semen Analysis Explained

The semen analysis is the primary and most informative test for male fertility evaluation. It should be among the first investigations ordered when a couple has been trying to conceive without success — yet it is often deprioritized or delayed.

WHO 2021 reference values (5th percentile of fertile men):

• Volume: ≥1.4 mL
• Sperm concentration: ≥16 million/mL
• Total sperm count: ≥39 million per ejaculate
• Total motility (progressive + non-progressive): ≥42%
• Progressive motility: ≥30%
• Normal morphology (strict Kruger criteria): ≥4%
• Vitality (live sperm): ≥54%

These values represent the 5th percentile of men who fathered a pregnancy within 12 months — meaning approximately 95% of fertile men have values above these thresholds. However, they should not be interpreted as absolute cutoffs: men with values slightly below the reference can still conceive naturally, and men with values above the reference can still have fertility challenges (particularly with DNA fragmentation or abnormal sperm function tests not captured by standard analysis).

How to prepare for a semen analysis:

• Abstain from ejaculation for 2–7 days (48–72 hours is optimal for most parameters)
• Collect sample via masturbation into a sterile container
• Analyze within 30–60 minutes of collection
• Avoid lubricants (most are spermicidal)
• Avoid alcohol, smoking, and hot baths for at least 3 days prior
• If results are abnormal, repeat after 3 months (one full spermatogenesis cycle)

The importance of repeating abnormal results: Semen analysis parameters can vary significantly between samples taken weeks apart, due to illness, stress, heat exposure, or other transient factors. The WHO recommends confirming abnormal results with a second sample before making clinical decisions, unless the abnormality is severe (e.g., azoospermia).

Advanced Fertility Testing Options

Beyond the standard panel, a range of more specialized tests can identify subtle causes of infertility, recurrent miscarriage, or repeated IVF failure.

Sperm DNA Fragmentation Index (DFI): Standard semen analysis assesses sperm quantity and movement but does not evaluate the integrity of the genetic material within the sperm. DNA fragmentation — breaks or nicks in the sperm's DNA strands — is increasingly recognized as a significant cause of male subfertility that is invisible to routine semen analysis. Tests include TUNEL assay, SCSA, and SCD (halo) test. DFI above 15–25% (depending on the test used) is associated with reduced natural conception rates, higher miscarriage risk, and lower IVF/ICSI success rates. Lifestyle factors (smoking, heat, oxidative stress) and infection are leading reversible causes.

Endometrial Receptivity Array (ERA): A biopsy of the uterine lining performed in a simulated or natural cycle, the ERA assesses the expression of genes associated with endometrial receptivity to identify each woman's personalized implantation window. Most embryo transfers occur on a standard schedule; however, approximately 25–30% of women have a displaced implantation window, and for these women, timed transfers based on ERA results significantly improve success rates. ERA is most often recommended after two or more failed transfers with good-quality embryos.

Hysteroscopy: A minimally invasive camera examination of the uterine cavity, hysteroscopy can detect and treat structural abnormalities — polyps, fibroids, uterine septa, intrauterine adhesions (Asherman's syndrome) — that may impair implantation. Saline infusion sonography (SIS) or sonohysterography is a less invasive ultrasound-based alternative that can detect most intrauterine pathology.

Karyotyping: Chromosomal analysis of both partners, typically recommended after recurrent miscarriage (2+ losses), severe male factor infertility, or family history of chromosomal abnormalities. Balanced translocations — where chromosomal material is rearranged but not lost — can cause recurrent miscarriage or implantation failure without affecting the carrier's health.

NK cell and immunological testing: Natural killer (NK) cell activity in the uterine lining (uterine NK cells, or uNK) plays a critical role in implantation. Elevated uNK cell activity has been associated with implantation failure and recurrent miscarriage. Testing and treatment (typically with steroids, intralipids, or low-dose aspirin) remains somewhat controversial and is not yet part of standard care, but is offered by specialist reproductive immunology clinics.

Preimplantation Genetic Testing for Aneuploidies (PGT-A): An IVF add-on that screens embryos for chromosomal abnormalities (extra or missing chromosomes) before transfer. While controversial in terms of whether it improves cumulative live birth rates for all IVF patients, it is most consistently evidence-supported for women over 38, those with recurrent miscarriage, and those with repeated IVF failure with good-quality embryos.

When Should You Get Tested? Age-Based Timelines

The decision of when to seek fertility testing is influenced primarily by the female partner's age — because female fertility declines significantly with age, earlier evaluation allows more time for intervention if problems are found.

Under 35 years old: Current guidelines from NICE, ESHRE, and ASRM recommend seeking evaluation after 12 months of regular unprotected intercourse without conception. However, there are situations where earlier evaluation is appropriate (see below). Couples who know of a potential fertility issue in either partner should not wait 12 months.

35–37 years old: Seek evaluation after 6 months of trying without success. At 35, approximately 1 in 6 couples will face fertility challenges — early evaluation allows earlier intervention and preserves treatment options.

38–40 years old: Seek evaluation after 3 months of trying, or immediately if there are known fertility concerns. Ovarian reserve declines rapidly in the late 30s, and proactive investigation is strongly recommended.

Over 40: Seek evaluation immediately or proactively before trying to conceive. At 40, monthly fecundity rates are approximately 5% and declining. Understanding current ovarian reserve and egg quality status before trying allows strategic planning.

Circumstances warranting immediate evaluation regardless of age:

• Irregular or absent menstrual cycles
• Known or suspected PCOS or endometriosis
• Previous pelvic infection or sexually transmitted infection
• Previous ectopic pregnancy or pelvic surgery
• Known structural uterine abnormalities
• Two or more previous miscarriages
• Male partner with known history of varicocele, previous vasectomy, cryptorchidism, or cancer treatment

How to Prepare for Fertility Testing

Proper preparation ensures that results are accurate, interpretable, and as useful as possible. Here is a practical guide for both partners:

For women — blood tests:

• Day 2–3 tests (FSH, LH, E2, AFC): Must be done on Days 2, 3, or 4 of your menstrual cycle (Day 1 = first full day of menstrual bleeding). Contact your clinic on Day 1 to arrange same-day or next-day testing.
• Mid-luteal progesterone: Aim for approximately 7 days before expected next period (in a 28-day cycle, around Day 21)
• AMH: Can be tested on any day of the cycle; no special timing needed
• Thyroid and prolactin: Best tested fasting in the morning; avoid breast stimulation for 24 hours before prolactin testing

For men — semen analysis:

• Abstain from ejaculation for 2–5 days before collection (avoid extremes in either direction)
• Avoid alcohol, smoking, saunas, and hot baths for at least 3 days beforehand
• Try to be well rested and not acutely ill; postpone if you have had a fever in the past 3 months (high fever impairs sperm production)
• Collect sample at home or in the clinic according to lab instructions; deliver warm within 30–60 minutes if collecting at home

Questions to ask your doctor:

• What does my AMH level mean for my chances of natural conception vs. IVF?
• Is my FSH level consistent with my age?
• Should we test both partners simultaneously?
• Do I need a hysteroscopy or HSG to evaluate my uterus and tubes?
• What would you recommend as next steps based on these results?

Understanding Your Results and Next Steps

Receiving fertility test results can provoke anxiety — particularly when values fall outside the "normal" range. Here's how to contextualize common findings and understand what they mean for your fertility journey:

Elevated FSH: Suggests the pituitary is working harder to stimulate follicle development — a sign of reduced ovarian reserve. Does not mean conception is impossible, but may indicate a shorter fertility window and potentially a lower response to IVF stimulation. Specialist evaluation is recommended.

Low AMH: Indicates a smaller remaining egg pool. In women trying to conceive naturally who are otherwise healthy and cycling normally, low AMH does not predict the outcome of any given month's cycle. In the context of IVF, it predicts a lower number of eggs retrieved per cycle and may influence the decision to pursue egg freezing sooner rather than later.

Abnormal semen analysis: A single abnormal result should always be repeated after 2–3 months. If consistently abnormal, referral to a urologist or andrologist for physical examination, hormonal testing, and genetic evaluation is appropriate. Many cases of abnormal semen analysis can be improved with lifestyle changes, supplementation, or treatment of underlying causes.

Blocked tubes: If hysterosalpingography (HSG) or laparoscopy reveals blocked fallopian tubes, the treatment depends on the location and cause. Proximal blockages (near the uterus) can sometimes be cleared with tubal catheterization. Distal blockages (near the ovary) may require laparoscopic surgery or, if severe, IVF as the most effective path to conception.

Most importantly: abnormal fertility test results are a starting point, not a verdict. Many couples with initially challenging results go on to have healthy pregnancies — with appropriate medical support and timely intervention.

Frequently Asked Questions

At what age should I start thinking about fertility testing?

Many reproductive medicine specialists recommend women consider a baseline fertility assessment (AMH and AFC) from age 30–32, particularly if pregnancy is not planned until the mid-to-late 30s. This allows informed decision-making about timing — including whether egg freezing might be appropriate. If you have symptoms of endometriosis, PCOS, or irregular cycles, earlier evaluation is recommended regardless of age.

Does a normal semen analysis guarantee male fertility?

Not entirely. Standard semen analysis measures count, motility, and morphology but does not assess sperm function, DNA integrity, or chromosomal content. Men with normal semen analysis can still have high DNA fragmentation (associated with miscarriage and IVF failure), anti-sperm antibodies, or subtle morphological defects not captured by routine testing. If there is recurrent miscarriage or repeated IVF failure despite good embryo quality, DNA fragmentation testing is recommended.

Can fertility tests predict my chances of getting pregnant?

Tests can provide useful information about ovarian reserve, hormonal function, anatomical factors, and sperm quality — all of which influence fertility. However, no single test or panel can accurately predict the probability of conception for an individual. Fertility is the product of many interacting factors, and even couples with normal test results can experience delays, while those with abnormal results can sometimes conceive naturally.

Is AMH testing available without a referral?

In Hong Kong and many countries, private AMH testing is available through private clinics, private hospitals, and some direct-to-consumer testing services. While accessible, it is most useful when interpreted by a reproductive medicine specialist in the context of other findings (cycle day 3 hormones, AFC, and clinical history), rather than in isolation.

How often should I repeat fertility tests?

Ovarian reserve tests (AMH, AFC) typically do not need to be repeated more frequently than annually unless there has been ovarian surgery (which can acutely reduce AMH). Hormonal tests (FSH, LH, E2) should be repeated if previous results were borderline or if circumstances change. Semen analysis should be repeated after any major lifestyle change or intervention, or if treatment decisions are pending.

What does it mean if my FSH is high but my AMH is normal?

This seemingly contradictory finding does occur. High FSH with normal AMH may indicate early compromise of follicle quality or follicular response, even when the overall count remains adequate. It may also reflect an intermittent hormonal pattern — FSH varies cycle-to-cycle. The combined picture (AFC, clinical symptoms, age) is always more informative than any single result. Repeat testing is recommended.

Can I improve my test results?

AMH and AFC — which reflect the fixed pool of remaining follicles — cannot be increased. However, the quality of those eggs can potentially be supported through lifestyle optimization, targeted supplementation (particularly CoQ10 for egg quality and mitochondrial function), and reducing oxidative stress. Sperm parameters, by contrast, are highly modifiable and can improve substantially with lifestyle changes over 3 months.

Is fertility testing covered by insurance in Hong Kong?

Basic fertility investigations may be covered by some comprehensive medical insurance plans in Hong Kong. IVF and ART treatments are generally not covered by standard insurance policies. Individual policies vary widely — review your plan details carefully, and many private fertility clinics in Hong Kong offer transparent self-pay pricing for initial consultations and testing.

How do I find a reputable fertility clinic in Hong Kong?

Hong Kong has a number of well-regarded fertility clinics, including those affiliated with major hospitals (Queen Mary Hospital, Pamela Youde Nethersole Eastern Hospital) and private reproductive medicine centres. Look for clinics with board-certified reproductive endocrinologists (HKFROG fellowship or equivalent international qualifications), published success rates transparent to patients, and a multidisciplinary team including embryologists, counsellors, and nursing specialists.

What is the difference between a fertility clinic and a gynaecologist for fertility investigations?

A gynaecologist can perform initial fertility investigations (blood tests, pelvic ultrasound, referral for semen analysis) and is appropriate for the first line of evaluation. A reproductive endocrinologist (RE) or fertility specialist has additional subspecialty training in complex fertility diagnosis and all forms of assisted reproduction (IUI, IVF, ICSI, egg freezing). If initial investigations reveal abnormalities, or if you do not conceive within expected timelines, referral to an RE is recommended.