Male Infertility and Andrological Assessment

Male infertility refers to a man's inability to contribute to conception after a defined period of regular unprotected intercourse, and andrological assessment is the structured clinical and laboratory evaluation used to characterise the male reproductive system. Because a male factor contributes to roughly half of infertile couples, the systematic appraisal of the man is a core component of any infertility workup.

Definition

Male infertility is the failure to achieve a pregnancy with a fertile partner after twelve months of regular unprotected intercourse attributable, in whole or part, to the male; andrological assessment is the combined history, examination, semen analysis, hormonal testing, imaging and, where indicated, genetic evaluation used to characterise its cause.

Scope

This area orients the topics that make up the andrological evaluation: the semen analysis and its interpretation, the spectrum of disordered sperm production (azoospermia and oligozoospermia), functional sperm defects (motility and morphology), the endocrine and testicular basis of impaired spermatogenesis, and disorders of ejaculation and sexual function. It is a reference framework for understanding how the male contribution to fertility is assessed, not a protocol for diagnosis or treatment.

Sub-topics

• Azoospermia and Oligozoospermia: Etiology and Evaluation
• Ejaculation Disorders and Sexual Dysfunction
• Semen Analysis: Collection, Methodology and Interpretation
• Sperm Dysfunction: Motility Disorders and Morphologic Abnormalities
• Testicular Failure and Hormonal Assessment

Core questions

• Is there a male factor, and how severe is it?
• Does the semen profile point to a problem of sperm production, transport, or function?
• Is the abnormality pre-testicular (endocrine), testicular, or post-testicular (obstructive)?
• Are there reversible or treatable contributors, and are there genetic or systemic-health implications?

Key concepts

• Male factor infertility
• Semen analysis as the cornerstone test
• Pre-testicular, testicular, and post-testicular classification
• Spermatogenesis and the hypothalamic-pituitary-gonadal axis
• Obstructive versus non-obstructive causes
• Andrology as the clinical discipline of male reproduction

Mechanisms

Normal male fertility depends on intact spermatogenesis within the testis, driven by the hypothalamic-pituitary-gonadal axis, followed by sperm maturation in the epididymis, patent ductal transport, and functional delivery through ejaculation. Andrological assessment maps a presentation onto this pathway: endocrine (pre-testicular) failure disrupts hormonal drive; primary testicular failure impairs sperm production directly; and post-testicular problems obstruct or disorder the transport and delivery of otherwise produced sperm. The semen analysis is the integrating measurement, and abnormalities in count, motility, or morphology direct further endocrine, imaging, or genetic evaluation.

Clinical relevance

Because male factors contribute to about half of couple infertility, a structured andrological assessment is part of evaluating any infertile couple, and findings such as azoospermia can also flag underlying systemic or genetic conditions. This area describes how that evaluation is organised and interpreted; it is educational reference material and not a substitute for individualised clinical assessment or treatment.

Epidemiology

Infertility affects roughly one in six couples, and a male factor is identified, alone or together with a female factor, in approximately half of these. The distribution of causes spans varicocele, endocrine disorders, genetic conditions, obstruction, infection, and a large idiopathic fraction, with semen quality also serving as a broader marker of men's health.

Evidence & guidelines

Contemporary practice is anchored by professional guidelines including the AUA/ASRM guideline on diagnosis and treatment of male infertility (Schlegel et al., 2021) and ASRM committee opinions on diagnostic evaluation, while the World Health Organization laboratory manual and its reference values (Cooper et al., 2010) standardise semen analysis. These are evidence summaries for orientation and do not constitute individual medical advice.

History

Andrology emerged as a distinct clinical discipline in the twentieth century alongside standardised semen analysis. The successive editions of the World Health Organization laboratory manual progressively harmonised how semen is examined and reported, and the introduction of evidence-based reference values reframed the interpretation of male fertility around population-derived distributions rather than arbitrary thresholds.

Seminal works

• cooper-2010
• schlegel-2021
• agarwal-2021

Frequently asked questions

What is andrology?

Andrology is the branch of medicine concerned with the male reproductive system, including the evaluation of male infertility, sperm production and function, and related hormonal and ejaculatory disorders.

How often is the male the cause of a couple's infertility?

A male factor is identified, alone or alongside a female factor, in roughly half of infertile couples, which is why structured evaluation of the man is a routine part of the couple's workup.