Semen Analysis Test in Australia

What a semen analysis is

A semen analysis is a structured laboratory assessment of one ejaculate against internationally standardised criteria, reporting both how many sperm are present and how well they move and are formed.

The examination begins with the fluid itself: volume, appearance, viscosity, liquefaction time and pH. These reflect the contributions of the seminal vesicles and prostate, and an abnormality here can point to an obstruction or an accessory gland problem even when sperm numbers are adequate.

The laboratory then counts sperm concentration per millilitre and calculates the total number in the ejaculate — the more biologically meaningful figure, since a small-volume sample can have a high concentration but a low total. Motility is graded as progressive (moving purposefully forward), non-progressive and immotile. Morphology is assessed against strict criteria, and vitality staining distinguishes immotile-but-living sperm from dead ones.

Australian andrology laboratories report against World Health Organization reference values. The sixth edition, published in 2021, sets the lower reference limits used in current practice. Those limits are the fifth percentile of men who fathered a child within twelve months — they are a statistical reference point, not a pass mark, and men below them do conceive.

Why a semen analysis is performed

Semen analysis is performed to investigate a couple's difficulty conceiving, to confirm the success of a vasectomy, and to establish a baseline before treatment that may affect fertility.

Around one in six Australian couples of reproductive age experience infertility, and a male factor contributes in roughly half of those cases. Despite that, investigation still frequently begins and sometimes ends with the female partner. A semen analysis is inexpensive, non-invasive and fast, and doing it early avoids months of one-sided investigation.

The second common indication is post-vasectomy confirmation, where the laboratory is looking specifically for the absence of motile sperm rather than assessing quality. Clearance is confirmed only by the test, not by elapsed time.

A third is baseline assessment before treatment known to affect spermatogenesis — chemotherapy or radiotherapy being the clearest examples — where sperm storage may be offered beforehand. Men who have used anabolic steroids or exogenous testosterone are another important group, since suppression of the hypothalamic-pituitary-gonadal axis reduces sperm production, sometimes profoundly and sometimes for a prolonged period after stopping.

What abnormal high or unusual results can indicate

Higher-than-expected values are rarely a clinical concern; the findings that matter above the reference range are raised leucocytes and abnormal fluid characteristics.

A high sperm concentration is not associated with harm and does not require action. What does warrant attention is a raised leucocyte (white blood cell) count above roughly 1 million per millilitre, which can indicate infection or inflammation of the male reproductive tract and may prompt your doctor to arrange a semen culture and examination.

Abnormal viscosity or delayed liquefaction can impair sperm movement out of the seminal fluid, and a high pH may accompany infection. Because these are fluid rather than sperm findings, they can occur alongside entirely normal sperm numbers.

Any abnormal finding should be reviewed by your GP or a urologist or fertility specialist. Semen parameters fluctuate considerably, so an isolated abnormality is usually repeated before conclusions are drawn.

What low semen analysis results can indicate

Results below WHO reference limits describe reduced sperm number, movement or normal forms, and indicate a lower probability of natural conception rather than infertility.

The standard terminology maps directly onto the parameters: oligozoospermia (low concentration or total number), asthenozoospermia (reduced motility), teratozoospermia (reduced normal forms), oligoasthenoteratozoospermia (all three) and azoospermia (no sperm found in the sample after centrifugation).

Causes are wide-ranging: varicocele, previous testicular injury, torsion or undescended testis, infection, genetic conditions such as Klinefelter syndrome or Y-chromosome microdeletions, obstruction, and endocrine causes including hypogonadotrophic hypogonadism. Reversible contributors include recent fever, heavy alcohol intake, smoking, some medications, significant heat exposure, obesity and exogenous testosterone or anabolic steroid use.

Because spermatogenesis takes approximately 72 to 90 days, a result reflects conditions of the previous three months. An illness in the weeks before collection can meaningfully depress a result that would otherwise be normal. That is why a repeat sample after several weeks is standard practice before a diagnosis is made, and why treatment decisions belong with a specialist rather than with a single number.

Semen analysis reference values used in Australia

Australian laboratories report against the World Health Organization sixth-edition lower reference limits, which represent the fifth percentile of recently fertile men.

A result below a limit does not mean conception is impossible, and a result above every limit does not guarantee it. Interpretation is always in the context of the couple, including the female partner's assessment.

Who should consider a semen analysis

Semen analysis is indicated for men whose partner has not conceived after twelve months of trying, after vasectomy, and before treatment that may impair fertility.

• Twelve months of regular unprotected intercourse without conception — or six months if the female partner is over 35.
• Confirming clearance after a vasectomy.
• Before chemotherapy, radiotherapy or other treatment that may affect fertility.
• Previous testicular surgery, torsion, undescended testis, mumps orchitis or significant injury.
• Current or past use of anabolic steroids or exogenous testosterone.
• Wanting a documented baseline before delaying fathering children.

How semen analysis works with FORM in Australia

FORM issues the request for an accredited andrology laboratory, the laboratory arranges collection, and you receive a written interpretation to take to your GP or specialist.

FORM provides diagnostic testing and interpretation only. We do not provide fertility treatment or prescribe medicines.

• Order online — no GP referral required.
• Receive your pathology request form by email.
• Book collection with a NATA-accredited (ISO 15189) andrology laboratory. Most provide an on-site private collection room; some accept a sample produced at home if it reaches the laboratory within an hour at body temperature.
• Abstain from ejaculation for 2 to 7 days before collection.
• Receive a written, plain-English report against WHO reference values.
• Take the report to your GP, urologist or fertility specialist.