Fertility Testing: A Complete Guide to Understanding Your Reproductive Health

For couples trying to conceive — whether just beginning or after months of trying without success — fertility testing provides crucial insights into reproductive health that inform next steps, timelines, and treatment decisions. Yet the world of fertility testing can feel confusing: multiple acronyms, different test types, varying reference ranges, and often conflicting information online.

This comprehensive guide to fertility testing demystifies the key investigations available for both women and men, explains what each test measures and why it matters, and helps you understand how to interpret results — so you can have more productive conversations with your healthcare provider.

When Should You Pursue Fertility Testing?

Standard guidelines recommend seeking fertility assessment after:

• 12 months of regular unprotected sex without conception (for women under 35)
• 6 months of regular unprotected sex without conception (for women 35 and over)
• Immediately if there are known risk factors: irregular cycles, previous STIs, endometriosis diagnosis, prior fertility treatment, male factor concerns, or known medical conditions affecting fertility

You don't need to wait the full guideline period if you or your partner have known risk factors or concerns. Many reproductive endocrinologists and fertility clinics offer comprehensive fertility testing packages that you can access directly without a referral in Hong Kong and many other jurisdictions.

Fertility Testing for Women: Key Investigations

Anti-Müllerian Hormone (AMH)

AMH is produced by small antral follicles in the ovaries and is the most clinically useful marker of ovarian reserve — roughly, the quantity of eggs remaining. Unlike FSH, AMH remains relatively stable throughout the menstrual cycle and can be tested on any day.

What AMH tells you: Higher AMH indicates a larger pool of remaining eggs; lower AMH suggests reduced ovarian reserve. AMH declines naturally with age but can be lower than expected for age due to genetics, prior ovarian surgery, chemotherapy, or autoimmune conditions.

Reference ranges: These vary between laboratories, but broadly:

• Optimal (age-appropriate normal): 1.5–4.0 ng/mL (10.7–28.6 pmol/L)
• Low normal: 1.0–1.5 ng/mL
• Low (diminished ovarian reserve): <1.0 ng/mL
• Undetectable/severely diminished: <0.3 ng/mL

Important context: AMH measures quantity, not quality. A good AMH doesn't guarantee good eggs, and a low AMH doesn't mean conception is impossible. Many women with low AMH conceive naturally or with minimal intervention. AMH is most useful in predicting ovarian response to stimulation in IVF contexts.

Antral Follicle Count (AFC)

The antral follicle count is performed via transvaginal ultrasound, typically on cycle days 2–5. The sonographer counts the number of small follicles (2–10mm) visible in both ovaries. AFC directly visualises the available follicle pool and is the most predictive test for IVF response when combined with AMH.

AFC interpretation:

• Good response expected: AFC ≥16
• Normal response: AFC 6–15
• Poor response risk: AFC <6

Follicle-Stimulating Hormone (FSH)

FSH is released by the pituitary gland to stimulate follicle development. Elevated FSH on day 2–3 of the cycle indicates the pituitary is working harder to recruit follicles — often a sign of reduced ovarian reserve. However, FSH fluctuates cycle to cycle, making it less reliable than AMH as a standalone test.

Normal day 3 FSH: Below 10 mIU/mL is generally considered normal; above 10–12 mIU/mL suggests reduced reserve; above 15–20 mIU/mL is associated with poor IVF response.

Oestradiol (E2) — Cycle Day 3

Oestradiol on day 3 of the cycle provides context for the FSH result. An elevated oestradiol on day 3 (above 60–80 pg/mL) can artificially suppress FSH, making FSH appear falsely normal when reserve is actually compromised. Always interpret FSH and E2 together.

Luteinising Hormone (LH)

LH surges mid-cycle to trigger ovulation. In fertility testing, LH levels at cycle day 3 help assess basal hormonal status. Elevated baseline LH may indicate PCOS. LH:FSH ratio above 2:1 or 3:1 on day 3 is one diagnostic criterion for PCOS.

Progesterone (Day 21 or Mid-Luteal)

Progesterone rises after ovulation, secreted by the corpus luteum. A "day 21" progesterone blood test (actually timed ~7 days after ovulation, which is day 21 in a textbook 28-day cycle) confirms whether ovulation occurred. A result above 30 nmol/L generally confirms ovulation; lower results may indicate anovulation or luteal phase deficiency.

Thyroid Function Tests (TSH, Free T4)

Thyroid disorders — both hypothyroidism and hyperthyroidism — significantly impair fertility and increase miscarriage risk. TSH (thyroid-stimulating hormone) and free T4 are essential components of fertility testing. TSH above 2.5 mIU/L in women trying to conceive is increasingly treated by fertility specialists, even if within the broader "normal" laboratory range.

Prolactin

Elevated prolactin (hyperprolactinaemia) suppresses ovulation and can cause irregular or absent periods. Mild elevation can result from stress, recent exercise, or certain medications. If elevated, repeat testing under optimised conditions and investigation for pituitary causes (adenoma) may be needed.

Pelvic Ultrasound

A baseline pelvic ultrasound as part of fertility testing evaluates uterine anatomy (fibroids, polyps, uterine shape), endometrial thickness and appearance, ovarian morphology (polycystic appearance, endometriomas), and AFC as above. Many abnormalities identifiable on ultrasound — such as submucous fibroids or large polyps — are treatable and can significantly improve fertility outcomes when addressed.

Hysterosalpingogram (HSG)

An HSG is an X-ray procedure where contrast dye is injected through the cervix into the uterine cavity and fallopian tubes. It evaluates tubal patency (whether the tubes are open for egg transit) and uterine cavity shape. Blocked tubes — most commonly from prior pelvic inflammatory disease or endometriosis — are identified by this test and direct management (such as IVF bypassing the tubes).

Some women experience significant cramping during HSG. There is also a well-documented "fertility effect" of HSG itself — the oil-based contrast media may clear mild tubal blockages and some women conceive in the cycles following HSG, possibly from a mild immune-modulatory effect of the procedure.

Hysteroscopy

A hysteroscopy involves passing a thin camera through the cervix to directly visualise the inside of the uterine cavity. It is the gold standard for diagnosing and treating intrauterine abnormalities including polyps, fibroids, septa, and adhesions (Asherman's syndrome). Hysteroscopy is typically recommended when HSG shows an abnormality or in women with recurrent implantation failure.

Fertility Testing for Men: Key Investigations

Semen Analysis

The semen analysis is the cornerstone of male fertility testing and should always be performed early in any couple's investigation. It evaluates:

• Volume: Normal >1.4 mL per ejaculate
• Concentration: Normal ≥16 million sperm/mL (WHO 2021 reference values)
• Total motility: Normal ≥42% motile sperm
• Progressive motility: Normal ≥30% moving forward
• Morphology (Kruger strict criteria): Normal ≥4% normal forms
• Vitality: Normal ≥54% live sperm

Results below these thresholds describe oligozoospermia (low count), asthenozoospermia (poor motility), or teratozoospermia (abnormal morphology) — conditions that affect fertilisation potential but often respond to lifestyle optimisation and targeted supplementation.

A single abnormal semen analysis should always be repeated after 2–3 months, as sperm production fluctuates with illness, temperature, stress, and lifestyle factors.

Sperm DNA Fragmentation Testing

Standard semen analysis cannot assess sperm DNA quality. Sperm DNA fragmentation (SDF) testing measures the percentage of sperm with damaged or fragmented DNA strands. High DNA fragmentation affects fertilisation rates, embryo development quality, and is associated with recurrent pregnancy loss.

SDF testing is particularly recommended for:

• Couples with unexplained infertility
• Recurrent pregnancy loss
• Poor embryo development in IVF despite normal semen parameters
• Failed IVF/ICSI cycles

The most common SDF tests are TUNEL and SCSA, with DNA fragmentation index (DFI) below 15% considered normal; 15–25% borderline; above 25% elevated.

Hormone Testing for Men

When semen analysis is abnormal, hormonal testing helps identify the underlying cause:

• FSH and LH — Evaluate the pituitary-testicular axis. Elevated FSH with low sperm count points to primary testicular failure; low FSH with low count suggests hypogonadotrophic hypogonadism (treatable with hormone therapy)
• Testosterone (total and free) — Low testosterone affects libido, energy, and sperm production
• Prolactin — Elevated prolactin in men suppresses testosterone and sperm production
• Thyroid function — Thyroid disorders affect sperm parameters in men as well as women

Testicular Ultrasound

When there are physical concerns (varicocele — enlarged testicular veins, hydrocele, testicular mass), ultrasound provides direct visualisation. Varicocele is present in approximately 35% of men with infertility and is a treatable condition that can significantly improve sperm parameters post-repair.

Genetic Testing in Fertility Investigation

Certain fertility challenges have genetic underpinnings that fertility testing can identify:

• Karyotype analysis — Chromosomal abnormalities (such as Klinefelter syndrome 47,XXY in men with severe male factor) can be identified
• Y chromosome microdeletion testing — Men with very low or absent sperm counts may have deletions in the AZF regions of the Y chromosome; certain deletions predict success of surgical sperm retrieval
• MTHFR testing — The C677T and A1298C variants affect folate metabolism, relevant for supplementation decisions and potentially for recurrent pregnancy loss
• Cystic fibrosis gene testing — Men with congenital bilateral absence of the vas deferens (CBAVD) typically carry CF mutations; partner testing matters for reproductive planning
• Fragile X premutation testing — In women with premature ovarian insufficiency

Recurrent Pregnancy Loss Testing

For couples experiencing three or more consecutive pregnancy losses, or in some guidelines two or more losses, targeted fertility testing for underlying causes includes:

• Antiphospholipid antibody syndrome panel (lupus anticoagulant, anticardiolipin, anti-beta2 glycoprotein I)
• Parental karyotyping
• Uterine anatomy assessment (HSG or sonohysterogram)
• Thyroid function
• Natural killer cell testing (controversial but offered by some fertility clinics)

Frequently Asked Questions: Fertility Testing

Q: How do I request fertility testing in Hong Kong?
A: You can request fertility testing through your gynaecologist, GP, or directly through a fertility clinic. Many private fertility clinics in Hong Kong offer comprehensive testing packages without requiring a specialist referral.

Q: Should both partners be tested at the same time?
A: Yes. Male factor contributes to approximately 40–50% of infertility cases. Investigating both partners simultaneously is the most efficient approach and avoids delays in identifying the contributing factors.

Q: Is a low AMH result a definitive sign I can't conceive?
A: No. AMH measures ovarian reserve quantity, not egg quality. Many women with low AMH conceive naturally or with minimal intervention. It is one data point among many in fertility assessment.

Q: How often should fertility tests be repeated?
A: AMH, AFC, and semen analysis may change over time. Annual testing is reasonable for those in prolonged TTC journeys; individual tests may be repeated per clinical need.

Q: Can lifestyle changes improve fertility test results?
A: Yes, particularly for men. Semen parameters respond to lifestyle optimisation — smoking cessation, alcohol reduction, heat avoidance, and targeted supplementation can meaningfully improve sperm count, motility, and morphology over 3 months.

Q: What should I do with abnormal fertility test results?
A: Discuss results with a reproductive endocrinologist or fertility specialist who can contextualise them within your complete clinical picture and advise on appropriate next steps.

Q: Does stress affect fertility test results?
A: Acute stress around the time of testing (particularly for semen analysis) can transiently affect results. Both partners should be well-rested and ideally not acutely unwell at the time of testing.

Q: Is fertility testing covered by insurance in Hong Kong?
A: Coverage varies significantly. Many basic tests (hormone panels, semen analysis) are covered by comprehensive health insurance plans, while specialised tests and procedures may require out-of-pocket payment. Check with your insurer before proceeding.

Q: Can supplements improve fertility test results?
A: Targeted supplementation can support fertility health alongside testing. For men, zinc, selenium, CoQ10, and folate support sperm health. For women, CoQ10, methylfolate, and vitamin D support ovarian function. Conceive Plus offers both women's and men's fertility supplement ranges designed to complement your fertility journey.

Q: At what age should women proactively check their fertility?
A: Proactive AMH and AFC testing from age 30–35 gives valuable baseline information for family planning. Women who know they want children but aren't ready yet may benefit from early testing to understand their timeline.

Taking Action After Fertility Testing

Fertility testing is not an end point — it's a starting point. Armed with accurate information about your reproductive health, you and your healthcare team can make informed decisions about timelines, interventions, and next steps. Results that seem alarming in isolation often look different in the context of a full clinical picture, and many fertility challenges have effective solutions.

While undergoing fertility testing, supporting your reproductive health through targeted nutrition and supplementation is one of the most productive things you can do. Conceive Plus provides fertility supplements for both women and men, formulated to support the specific nutritional needs of people trying to conceive.

Support your fertility journey with Conceive Plus →

This article is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider or fertility specialist for personalised assessment and guidance.