Free Semen Analysis Interpreter, Based on WHO 2021 Standards

How to Use This Tool

Using the semen analysis interpreter is straightforward. You do not need a complete report; enter only the values you have available.

Step 1.  Enter your values

Type the numbers from your semen analysis report into the corresponding fields. All parameters are optional except for at least one; the tool will interpret whatever you provide. Values should be entered exactly as they appear on your lab report.

Step 2. Click “Interpret My Results”

The tool instantly compares each value you entered against the WHO 2021 (6th Edition) lower reference limits and classifies each parameter as Normal, Borderline, or Below Normal.

Step 3. Read your interpretation

Each parameter receives a detailed explanation of what your specific result means, what may be causing it if it is below the reference range, and what steps are typically recommended. An overall summary at the top gives you an immediate picture of your results as a whole.

A note on privacy

No data you enter is stored, transmitted, or shared. The tool runs entirely within your browser; your results remain completely private.

Understanding your semen analysis results

A semen analysis (also called a spermogram) is the primary test used to assess male fertility. It measures several distinct characteristics of sperm and semen, each of which tells a different part of the story about a man’s reproductive health. Understanding what each parameter measures, and why it matters, is the first step toward making sense of your results.

Semen Volume

Semen volume refers to the total amount of fluid produced in a single ejaculation. Adequate volume is important because it creates the medium in which sperm travel and provides protection from the acidic environment of the vagina. The WHO 2021 lower reference limit is 1.4 ml. Very low volume may indicate a blockage in the ejaculatory ducts, retrograde ejaculation, or issues with the seminal vesicles or prostate. Very high volume can dilute sperm concentration.

Sperm Concentration

Sperm concentration measures how many sperm are present per millilitre of semen. This is one of the most commonly reported values on a semen analysis. The WHO 2021 lower reference limit is 16 million sperm per millilitre (million/ml). A count below this is classified as oligospermia, which reduces the likelihood of natural conception. Causes include hormonal imbalance, varicocele, heat exposure, infection, and certain lifestyle factors.

Total Sperm Count

Total sperm count is the total number of sperm in the entire ejaculate; calculated by multiplying concentration by volume. Many fertility specialists consider this the most clinically meaningful count parameter, as it reflects how many sperm are actually delivered per attempt at conception. The WHO 2021 lower reference limit is 39 million per ejaculate.

Total Motility

Total motility is the percentage of sperm that are moving in any direction. Moving sperm are essential for fertilisation because they must travel through the female reproductive tract to reach the egg. The WHO 2021 lower reference limit is 42%. When total motility falls below this threshold, the condition is called asthenospermia, and natural conception becomes significantly more difficult.

Progressive Motility

Progressive motility is the percentage of sperm moving forward in a straight line or large circles. This is considered the most clinically important motility parameter because only sperm that move forward purposefully can successfully navigate the female reproductive tract and reach the egg. The WHO 2021 lower reference limit is 30%. Progressive motility is frequently affected by oxidative stress, infection, and varicocele.

Normal Morphology

Morphology refers to the shape and structure of sperm, specifically the percentage that are considered normally formed under strict Kruger criteria. Abnormally shaped sperm may have difficulty binding to and penetrating the egg. The WHO 2021 lower reference limit is 4%. It is important to note that even in fertile men, the majority of sperm are morphologically abnormal. 4% is the minimum threshold, not an ideal target. When morphology falls below this, the condition is called teratospermia.

Sperm Vitality

Sperm vitality measures the percentage of live sperm in the sample, including both moving and non-moving sperm. This parameter is important because not all non-moving sperm are dead; some are alive but immotile, which has different clinical implications. The WHO 2021 lower reference limit is 54%. Very low vitality, where most sperm are dead, is called necrospermia and may indicate infection, oxidative stress, or epididymal dysfunction.

DNA Fragmentation Index (DFI)

DNA fragmentation measures the amount of damage to the genetic material inside the sperm. Unlike the parameters above, a lower DFI is better; the WHO-referenced threshold for concern begins above 15%, with DFI above 25% considered high. High DNA fragmentation is one of the most underdiagnosed causes of male infertility and is strongly associated with failed IVF cycles, poor embryo quality, and recurrent miscarriage. It is not measured in all standard semen analyses and must often be requested separately.

To learn more about the causes and treatment of specific sperm problems, read our detailed guides on male infertility, sperm problems in infertility, fertility tests for men, and ways to increase sperm quality.

What Do the WHO 2021 Reference Values Mean?

The reference values used in this tool come from the WHO Laboratory Manual for the Examination and Processing of Human Semen, 6th Edition, published in 2021. This is the most authoritative and widely used international standard for semen analysis, and the one followed by fertility laboratories and specialists across the world.

It is important to understand what these reference values represent. They are not ideal targets or averages; they are lower reference limits derived from studying men who achieved pregnancy with their partners within 12 months. In other words, a result at or above the reference limit means your value falls within the range seen in men who are known to be fertile. A result below the reference limit does not automatically mean infertility; it means your result is outside the range most commonly associated with natural conception within one year.

Here is a complete reference table of all parameters assessed in this tool:

An important note about the 2021 update

The WHO 2021 (6th Edition) reference values differ in several key ways from the previous 2010 (5th Edition) standards. The most significant changes are:

• Sperm concentration threshold increased from 15 million/ml to 16 million/ml
• Total sperm count threshold increased from 39 million to 39 million per ejaculate (unchanged but clarified)
• Total motility threshold increased from 40% to 42%
• Progressive motility threshold decreased from 32% to 30%
• Sperm vitality threshold decreased from 58% to 54%
• Semen volume threshold decreased from 1.5 ml to 1.4 ml

If your semen analysis was interpreted using the 2010 standards, some values may be classified differently under the 2021 criteria. This tool uses the 2021 (6th Edition) reference limits.

What to Do if Your Results Are Abnormal

Receiving abnormal semen analysis results can feel alarming, but it is important to understand that an abnormal result is not a final verdict on your fertility. It is a starting point for investigation, and in the majority of cases, the underlying cause is identifiable and treatable.

If your results are borderline

Borderline results (values that are slightly below the WHO 2021 reference limits) are common and do not necessarily mean infertility. Many men with borderline sperm parameters conceive naturally. However, borderline results are a signal worth taking seriously. Targeted lifestyle changes, nutritional supplementation, and a specialist review can often bring borderline parameters back within the normal range within 3 months. Since sperm take approximately 70-90 days to mature, consistent improvement efforts over this period will show up clearly in a follow-up semen analysis.

If one or more results are clearly below normal

When one or more parameters fall significantly below the WHO reference limits, a thorough medical evaluation is recommended. The semen analysis result alone does not tell you why the parameter is abnormal; identifying the underlying cause requires a specialist review of your full medical history, hormone blood tests, and in some cases additional investigations such as a DNA fragmentation test, scrotal ultrasound, or genetic screening. The good news is that most causes of abnormal semen parameters (including hormonal imbalance, varicocele, infection, and nutritional deficiency) respond well to treatment.

If multiple parameters are abnormal

When several parameters are abnormal simultaneously, this typically indicates a systemic issue affecting sperm production or quality across the board. This is more likely to require active medical treatment than lifestyle changes alone. However, even men with very poor semen analysis results have gone on to father biological children through natural conception after treatment, or through assisted reproduction techniques such as IUI, IVF, or ICSI. The appropriate path depends entirely on the specific pattern of your results and your full clinical picture.

When to seek specialist help immediately

Seek specialist evaluation without delay if any of the following apply:

• Your sperm concentration is below 5 million/ml
• Your semen analysis shows zero sperm (azoospermia)
• Your DNA fragmentation index is above 25%
• You have been trying to conceive for 12 months or more without success
• You have a known history of infections, surgeries, or injuries to the reproductive area
• You are over 40 and actively trying to conceive

Frequently Asked Questions