Andrology

Andrology is the medical specialty focused on male reproductive health and male sexual health. It covers issues involving fertility, sperm and semen quality, testosterone and other hormones, erectile function, the testes, prostate-related concerns, and conditions that affect a man’s ability to conceive or maintain reproductive wellness. If you have seen the term on a clinic website, lab report, or referral, it usually means care related to men’s fertility, hormones, or reproductive organs.

What Is Andrology?
Andrology at a Glance
Why Andrology Matters
What Andrologists Do
Common Conditions Managed in Andrology
Symptoms and Signs That May Point to an Andrology Issue
Common Causes and Risk Factors
How Andrology Problems Are Diagnosed
Key Andrology Tests and What They Measure
What’s Normal vs What’s Not?
How Andrology Affects Fertility and Conception
Treatment Options in Andrology
Lifestyle Changes That May Support Male Reproductive Health
Common Myths About Andrology
Questions to Ask Your Doctor
Related Tests and Terms
Frequently Asked Questions
References

What Is Andrology?

Andrology is often described as the male counterpart to gynecology, although the comparison is not perfect. In practical terms, andrology focuses on the diagnosis, evaluation, and treatment of conditions affecting the male reproductive system and male sexual function.

That includes concerns such as:

Male infertility
Low testosterone or other hormone disorders
Erectile dysfunction
Ejaculation problems
Testicular disorders
Varicocele
Undescended testicles
Peyronie’s disease
Male contraception, including vasectomy and vasectomy reversal in some settings

Many people encounter andrology when trying to understand a semen analysis, improve sperm health, investigate trouble conceiving, or evaluate symptoms like low libido, fatigue, or testicular discomfort. Male factors contribute to infertility in a substantial share of couples, which is one reason andrology matters so much in fertility care. The World Health Organization manual for semen examination and guidance from the American Society for Reproductive Medicine both emphasize the importance of proper male evaluation in infertility workups.

Andrology at a Glance

Definition: A medical field focused on male reproductive and sexual health.
Who it helps: Men with fertility issues, hormone concerns, sexual dysfunction, or reproductive tract disorders.
Common tests: Semen analysis, hormone blood tests, scrotal ultrasound, genetic testing, and physical exam.
Common symptoms: Difficulty conceiving, erectile dysfunction, low libido, testicular pain, low energy, or abnormal puberty/development.
Common treatments: Lifestyle changes, medications, hormone management, surgery, and assisted reproductive techniques.
Fertility link: Andrology plays a central role in evaluating sperm count, motility, morphology, and other male fertility factors.
When to seek care: If pregnancy has not happened after trying, or if you have persistent sexual, hormonal, or testicular symptoms.

Why Andrology Matters

Andrology matters because male reproductive health is a major part of overall health, fertility, and quality of life. It is not only about conception. Problems that show up in an andrology clinic can reflect broader health issues such as obesity, diabetes, sleep apnea, pituitary disease, genetic conditions, medication effects, or cardiovascular risk.

For example, erectile dysfunction can sometimes be an early sign of vascular disease, as noted by the National Institute of Diabetes and Digestive and Kidney Diseases. Low testosterone symptoms may overlap with chronic illness, poor sleep, stress, depression, or medication side effects. An abnormal semen analysis can be linked to varicocele, hormonal imbalance, infection, heat exposure, toxic exposures, or testicular disorders.

In other words, andrology is important because it can help answer questions like:

Why are we not getting pregnant?
Why has my sex drive dropped?
Why is my testosterone low?
Why do I have testicular swelling or pain?
Why did my semen analysis come back abnormal?

It can also help guide the next steps safely and efficiently, especially when time matters for family-building.

What Andrologists Do

An andrologist is a doctor who focuses on male reproductive or sexual health. In many countries, andrology is practiced by urologists with additional expertise in male infertility, microsurgery, hormones, and sexual medicine. Some reproductive endocrinology and fertility centers also have andrology laboratories that process semen samples and support fertility treatment.

An andrology evaluation may include:

Detailed medical and reproductive history
Review of conception timeline and prior pregnancies
Medication and supplement review
Physical examination of the genitals and secondary sex characteristics
Semen testing
Hormone testing
Imaging, such as scrotal ultrasound, when needed
Discussion of treatment options, fertility timing, and referrals

In fertility care, the male evaluation is often recommended early rather than treating infertility as only a female issue. The American Urological Association and American Society for Reproductive Medicine male infertility guideline supports concurrent evaluation of both partners when infertility is suspected.

Common Conditions Managed in Andrology

Male infertility

This includes low sperm count, poor sperm motility, abnormal sperm morphology, absent sperm in the ejaculate, ejaculatory dysfunction, or unexplained fertility issues. Male infertility can result from pre-testicular, testicular, or post-testicular causes.

Hypogonadism and low testosterone

Hypogonadism means the body is not producing enough testosterone or enough sperm due to dysfunction at the testicular or pituitary-hypothalamic level. Symptoms may include low libido, fatigue, fewer morning erections, reduced muscle mass, infertility, or mood changes. The StatPearls overview of male hypogonadism and endocrine society guidance provide useful clinical context.

Erectile dysfunction

Erectile dysfunction is difficulty getting or keeping an erection firm enough for sex. Causes may be vascular, neurologic, hormonal, medication-related, or psychological.

Varicocele

A varicocele is an enlargement of veins in the scrotum. It is a common finding in men evaluated for infertility and may affect testicular temperature regulation and sperm production. The StatPearls review on varicocele offers a useful summary.

Peyronie’s disease

This condition causes fibrous plaque formation in the penis, which can lead to curvature, pain, or sexual dysfunction.

Testicular conditions

These may include testicular pain, masses, torsion, prior undescended testicle, injury, atrophy, or infection.

Ejaculation disorders

These include premature ejaculation, delayed ejaculation, retrograde ejaculation, and anejaculation.

Genetic or developmental disorders

Examples include Klinefelter syndrome, Y-chromosome microdeletions, congenital absence of the vas deferens, and disorders affecting puberty or testicular descent.

Symptoms and Signs That May Point to an Andrology Issue

Not every symptom means there is a serious problem, but several signs should prompt medical review, especially if they persist.

Difficulty conceiving after regular unprotected sex
Low libido or reduced sexual desire
Erectile dysfunction
Changes in ejaculation or orgasm
Testicular pain, swelling, heaviness, or a lump
Small testicular size or prior testicular injury
Low energy, reduced strength, or decreased body hair
Breast enlargement in men
Delayed puberty or incomplete puberty
History of undescended testicles

Seek urgent care for sudden, severe testicular pain because testicular torsion is a time-sensitive emergency. The NHS guidance on testicular torsion explains why rapid treatment matters.

Common Causes and Risk Factors

Andrology problems can have many causes. Some are reversible, some are treatable, and some remain unexplained even after a full workup.

Hormonal causes

Low testosterone
Pituitary disorders affecting LH and FSH
High prolactin
Thyroid disease

Testicular causes

Varicocele
Undescended testicles
Prior torsion
Infection such as mumps orchitis
Trauma
Chemotherapy or radiation exposure

Obstructive causes

Blockage of the epididymis or vas deferens
Prior surgery
Congenital absence of the vas deferens, which may be associated with CFTR mutations

Lifestyle and environmental factors

Smoking
Heavy alcohol use
Obesity
Poor sleep
Anabolic steroid use
Excess heat exposure to the testes
Certain workplace chemicals or toxins

Medication-related causes

Testosterone replacement can suppress sperm production
Some antidepressants may affect sexual function
Opioids can suppress hormones
Certain hair-loss, blood pressure, or prostate medications may affect sexual side effects in some men

Systemic health conditions

Diabetes
Sleep apnea
Kidney or liver disease
Autoimmune or inflammatory conditions

The effects of lifestyle and systemic health on male fertility are well recognized, and the WHO semen manual and infertility guidelines incorporate these factors into evaluation.

How Andrology Problems Are Diagnosed

Diagnosis starts with the basics: the right history, the right exam, and targeted testing. A single symptom rarely tells the whole story. For example, low libido can be related to testosterone, but it can also be linked to stress, poor sleep, depression, medications, or relationship factors.

What a clinician may ask about

How long you have been trying to conceive
Frequency and timing of intercourse
Prior pregnancies with current or previous partners
Childhood conditions such as undescended testicles
Puberty timing and sexual development
Past infections, surgeries, or injuries
Medication, supplement, and testosterone use
Smoking, alcohol, cannabis, and other substances
Occupation, heat exposure, and environmental exposures
Sexual symptoms, urinary symptoms, and general health symptoms

Physical exam may look for

Testicular size and consistency
Presence of vas deferens
Varicocele
Penile abnormalities
Breast enlargement
Body hair pattern and muscle mass

From there, testing is chosen based on the clinical picture rather than using every test for every person.

Key Andrology Tests and What They Measure

Andrology uses both laboratory and clinical testing. The exact panel depends on whether the main issue is fertility, hormones, erectile function, or another concern.

Core tests

Semen analysis: Measures semen volume, sperm concentration, total count, motility, morphology, and other features.
Hormone blood tests: Testosterone, LH, FSH, prolactin, estradiol, and sometimes thyroid tests.
Scrotal ultrasound: Useful for varicocele, masses, or structural concerns.
Genetic testing: Considered in severe sperm abnormalities or azoospermia.
Urinalysis or post-ejaculate urine: Can help evaluate retrograde ejaculation in selected cases.

Common andrology tests table

Test	What It Evaluates	Why It Matters
Semen analysis	Sperm count, motility, morphology, semen volume	Foundational test in male fertility evaluation
Total testosterone	Androgen status	Helps assess hypogonadism when symptoms are present
FSH and LH	Pituitary signals to the testes	Can help distinguish testicular vs central causes
Prolactin	Pituitary-related hormone excess	Useful when low libido, low testosterone, or sexual dysfunction is present
Scrotal ultrasound	Testicular structure, varicocele, masses	Helps identify anatomical causes
Genetic testing	Chromosomal or gene-related causes	Often used in azoospermia or very severe oligospermia

Semen testing should be interpreted carefully. Results can vary from sample to sample, which is one reason repeat testing is often recommended. The WHO Laboratory Manual for the Examination and Processing of Human Semen is the main international reference for semen analysis methods and interpretation.

What’s Normal vs What’s Not?

In andrology, “normal” depends on context. A result that falls within a reference range is not a guarantee of fertility or perfect health, and a result outside the range does not automatically mean infertility. Interpretation depends on symptoms, history, repeat testing, and the bigger clinical picture.

Semen analysis reference-style benchmarks

The WHO provides lower reference limits based on fertile men. These are not strict pass-fail cutoffs, but they are commonly used in fertility care.

Parameter	Common Reference Point	Why It Matters
Semen volume	About 1.4 mL or higher	Low volume may suggest collection issues, obstruction, or ejaculatory problems
Sperm concentration	About 16 million/mL or higher	Lower levels may reduce chances of conception
Total motility	About 42% or higher	Sperm need to move effectively to reach the egg
Progressive motility	About 30% or higher	Forward movement matters for natural conception
Normal morphology	About 4% or higher by strict criteria	Shape is one piece of the fertility picture
Total sperm number	About 39 million per ejaculate or higher	Reflects overall sperm output

For up-to-date methodology and interpretation, see the WHO semen manual.

Testosterone interpretation

Testosterone results should usually be measured in the morning and interpreted with symptoms, age, repeat testing, and lab method in mind. Different labs use different reference ranges. Low testosterone cannot be diagnosed reliably from one number without context. Guidance from the Endocrine Society emphasizes confirming low levels with appropriate testing and evaluating the cause before treatment.

Normal vs abnormal in plain English

Potentially reassuring: Mild symptoms with normal exam and normal repeat testing.
Needs follow-up: Low sperm count, no sperm seen, clearly low testosterone with symptoms, or a testicular lump.
Urgent: Sudden severe testicular pain, suspected torsion, or a new hard testicular mass.

How Andrology Affects Fertility and Conception

Andrology is central to male fertility because conception depends on more than just having sperm present. Sperm must be produced in adequate numbers, move effectively, and have the ability to fertilize an egg. Semen also has to be ejaculated normally and the reproductive tract needs to be open enough for sperm to travel.

Male-factor infertility may involve:

Oligozoospermia: Low sperm concentration
Asthenozoospermia: Reduced motility
Teratozoospermia: Higher proportion of abnormally shaped sperm
Azoospermia: No sperm seen in the ejaculate
DNA integrity issues: A developing area of testing and interpretation, not always needed routinely

Importantly, semen analysis does not capture everything about fertility, and natural conception can still happen with suboptimal values. On the other hand, apparently normal semen results do not rule out all male-factor issues. That is why the full andrology assessment matters.

When assisted reproductive treatment is needed, andrology can guide whether a couple may try timed intercourse, intrauterine insemination, IVF, or intracytoplasmic sperm injection. The treatment path depends on the specific cause, female partner factors, timeline, and reproductive goals.

Treatment Options in Andrology

Treatment depends entirely on the diagnosis. There is no single “andrology treatment.” The goal may be to improve fertility, relieve symptoms, correct a hormonal problem, restore sexual function, or treat an underlying medical condition.

Common treatment approaches

Lifestyle changes: Weight management, smoking cessation, moderating alcohol, improving sleep, reducing heat exposure, and stopping anabolic steroids.
Medication review: Adjusting medications that may impair hormones, erections, ejaculation, or fertility when medically appropriate.
Hormonal treatment: Selected men may benefit from fertility-preserving hormonal approaches rather than testosterone replacement, especially if trying to conceive.
Surgical treatment: Varicocele repair, sperm retrieval procedures, vasectomy reversal, or correction of obstructive issues in selected cases.
Sexual medicine treatments: Evidence-based treatment for erectile dysfunction or ejaculation disorders.
Assisted reproduction: IUI, IVF, or ICSI when natural conception is less likely or time is limited.

Important fertility note about testosterone therapy

Exogenous testosterone can suppress the hormonal signals needed for sperm production and may significantly reduce fertility. This is a key andrology issue that many men do not realize. Men trying to conceive should discuss fertility goals before starting testosterone. The AUA testosterone deficiency guideline highlights this concern.

Comparison table: common goals in andrology care

Clinical Goal	Possible Andrology Focus	Examples
Improve fertility	Optimize sperm production or delivery	Varicocele treatment, hormone evaluation, sperm retrieval, ART referral
Improve sexual function	Address erection, ejaculation, libido, or penile pain/curvature	ED treatment, Peyronie’s management, medication adjustment
Correct hormone imbalance	Identify cause of low testosterone or pituitary dysfunction	Repeat labs, imaging in select cases, targeted endocrine treatment
Treat structural problems	Fix obstruction or anatomy issues	Microsurgery, reversal procedures, scrotal surgery when indicated

Lifestyle Changes That May Support Male Reproductive Health

Not every andrology problem can be fixed with lifestyle alone, but daily habits do influence hormones, sperm production, vascular health, and sexual function. Reasonable, evidence-informed changes may help some men and support overall health even when medical treatment is also needed.

Maintain a healthy body weight
Exercise regularly without overtraining
Avoid anabolic steroids and non-prescribed testosterone
Stop smoking
Limit heavy alcohol use
Prioritize sleep and evaluate possible sleep apnea if symptoms fit
Manage diabetes, blood pressure, and other chronic conditions
Reduce prolonged high heat exposure to the scrotum when possible
Review supplements and medications with a clinician
Seek support for stress, anxiety, or depression when relevant

If fertility is the goal, avoid assuming that over-the-counter fertility supplements will solve the problem. Some may be reasonable in certain situations, but they do not replace proper evaluation for causes such as varicocele, obstruction, hormonal disease, or genetic conditions.

Common Myths About Andrology

Myth 1: Fertility problems are usually a female issue

Not true. Male factors contribute to a large proportion of infertility cases, either alone or alongside female factors. That is why both partners should usually be evaluated.

Myth 2: Normal testosterone means fertility is fine

Also false. A man can have normal testosterone and still have low sperm count, poor motility, obstruction, or other fertility issues.

Myth 3: Testosterone therapy always improves fertility

In fact, testosterone therapy can suppress sperm production and may worsen fertility while it is being used.

Myth 4: One abnormal semen analysis means permanent infertility

Not necessarily. Semen parameters can fluctuate. Repeat testing and proper interpretation matter.

Myth 5: Erectile dysfunction is always psychological

No. Erectile dysfunction may have vascular, neurologic, hormonal, medication-related, or mixed causes. It deserves a proper evaluation.

Questions to Ask Your Doctor

If you are seeing a clinician for fertility, hormone, or sexual health concerns, these questions can help you get clearer answers:

What is the most likely cause of my symptoms or abnormal test result?
Do I need repeat semen analysis or repeat hormone testing?
Should my partner and I be evaluated at the same time?
Could any of my medications or supplements affect fertility or testosterone?
Do I need a scrotal ultrasound or genetic testing?
If I want children soon, how does that affect treatment choices?
Would testosterone treatment reduce my sperm production?
What lifestyle changes are actually worth making in my case?
When should we consider referral to a fertility specialist?

Semen analysis: The core lab test for male fertility assessment.
Azoospermia: No sperm in the ejaculate.
Oligozoospermia: Low sperm concentration.
Asthenozoospermia: Reduced sperm motility.
Teratozoospermia: Abnormal sperm morphology.
Varicocele: Enlarged scrotal veins that may affect sperm production.
Hypogonadism: Inadequate testosterone production or testicular function.
FSH and LH: Pituitary hormones that regulate testicular function.
ICSI: A fertility treatment where a single sperm is injected into an egg.
Urology: A broader specialty covering the urinary tract and male reproductive organs; andrology is often a subspecialty within it.

Frequently Asked Questions

Is andrology the same as urology?

No. Urology is broader and includes urinary tract conditions in men and women. Andrology is more narrowly focused on male reproductive health, fertility, hormones, and sexual function.

What does an andrologist treat?

An andrologist may treat male infertility, low testosterone, erectile dysfunction, ejaculation problems, varicocele, Peyronie’s disease, and other testicular or reproductive concerns.

When should a man see an andrologist?

Consider evaluation if you have been trying to conceive without success, have persistent erectile or ejaculation issues, symptoms of low testosterone, testicular pain or swelling, or abnormal semen results.

Can andrology help with low sperm count?

Yes. Andrology evaluation can help identify causes of low sperm count and guide treatment, whether that involves lifestyle changes, surgery, hormone-directed treatment, or assisted reproduction.

Does testosterone therapy improve fertility?

Usually not. Testosterone therapy can suppress sperm production and may reduce fertility. Men trying to conceive should discuss alternatives with a qualified clinician.

What tests are done in andrology?

Common tests include semen analysis, testosterone and other hormone blood tests, scrotal ultrasound, physical examination, and sometimes genetic testing.

Is one abnormal semen analysis enough to diagnose infertility?

Not usually. Semen results can vary, so repeat testing is often recommended before drawing conclusions.

Can lifestyle changes improve male fertility?

They can help in some cases, especially when smoking, obesity, poor sleep, heavy alcohol use, or anabolic steroid use are contributing. But lifestyle changes do not replace medical evaluation.

What is the difference between andrology and male fertility?

Male fertility is one part of andrology. Andrology also includes sexual function, hormones, testicular health, penile conditions, and other aspects of male reproductive medicine.