A normal semen analysis shows at least 15 million sperm per milliliter, with 40% or more of those sperm moving and at least 4% with normal shape. Those three numbers, concentration, motility, and morphology, are the core of any semen analysis, but the full report includes several additional measurements that together paint a clearer picture of fertility potential.
Volume and Physical Properties
The first things measured are the physical characteristics of the sample itself. Normal semen volume is 1.5 milliliters or more per ejaculate. A sample below this may indicate a blockage, a hormonal issue, or an incomplete collection.
Fresh semen is thick and coagulated. It should liquefy within 20 to 25 minutes at room temperature, turning from a gel-like consistency into a more fluid liquid. If it stays thick beyond 60 minutes, sperm may have difficulty swimming freely. The pH of a normal sample falls between 7.2 and 8.0, which is slightly alkaline. A pH outside this range can suggest infection or a problem with the seminal vesicles or prostate.
Sperm Concentration and Total Count
Sperm concentration refers to how many sperm are packed into each milliliter of semen. The normal threshold is 15 million per milliliter. A count below that is called oligospermia, and below 5 million per milliliter is considered severe oligospermia. Total sperm count, which factors in the full volume of the ejaculate, should be at least 39 million.
These numbers have a wide normal range. Plenty of men with counts well above 15 million per milliliter still face fertility challenges due to other parameters, and some men with borderline counts conceive without difficulty. Concentration alone doesn’t determine fertility, which is why the analysis measures so many other factors.
Motility: How Sperm Move
Motility is one of the most important numbers on the report. It measures the percentage of sperm that are actively moving. At least 40% of sperm should be motile for a normal result.
Within that 40%, the lab distinguishes between progressive motility (sperm swimming forward in a straight line or large circles) and non-progressive motility (sperm that move but don’t make forward progress, like twitching in place). Progressive motility should be 32% or higher. This is the type that matters most, because only sperm swimming forward can reach and fertilize an egg.
Total Motile Sperm Count
Your report may include a value called total motile sperm count, or TMSC. This is calculated by multiplying total sperm count by the percentage that are moving. The reference range is 14 million motile sperm or more per ejaculate. Research from the University of Washington’s Male Fertility Lab identifies this as one of the most predictive single numbers for eventual pregnancy, because it combines volume, concentration, and motility into one figure. Fertility specialists often use TMSC to guide treatment decisions, such as whether to recommend timed intercourse, intrauterine insemination, or IVF.
Morphology: Sperm Shape
Morphology measures the percentage of sperm with a normal shape, meaning the head, midpiece, and tail all meet specific size and proportion criteria. Most labs use what’s known as strict criteria, and under this system the threshold for normal is just 4% or higher. That number surprises many people, but it’s completely normal for the vast majority of sperm to have some irregularity. Even in highly fertile men, 96% of sperm may be classified as abnormal under strict criteria.
When morphology falls below 4%, it’s harder for sperm to penetrate an egg, though it doesn’t make conception impossible. Men with 0 to 3% normal forms tend to have lower fertilization rates in IVF cycles, but many still achieve pregnancy with assisted reproduction.
Vitality: Live vs. Dead Sperm
If motility is low, the lab will typically run a vitality test to determine whether the non-moving sperm are alive or dead. This involves staining the sample with a dye that only penetrates dead cells. A normal result is 58% or more live sperm. The distinction matters because a live but immobile sperm cell can still be used in certain fertility procedures, while a dead one cannot.
White Blood Cells
Semen normally contains very few white blood cells. The traditional cutoff is fewer than 1 million per milliliter, though newer research suggests that inflammation may begin at lower concentrations, around 315,000 per milliliter. Elevated white blood cells can signal an infection or inflammation in the reproductive tract, which may damage sperm or reduce their function. If levels are high, your doctor will likely investigate with a culture or additional testing.
Why Results Vary Between Tests
Semen analysis results can fluctuate significantly from one test to the next. Sperm take roughly 72 to 90 days to develop, so anything that happened to your body two to three months before the test can show up in your results. A high fever, a bout of illness, heavy alcohol use, exposure to excessive heat (hot tubs, saunas, laptops on the lap), poor sleep, or high stress during that window can temporarily lower sperm count, motility, or morphology.
Because of this natural variability, a single abnormal result doesn’t necessarily mean there’s a lasting problem. Most fertility specialists will repeat the analysis at least once, typically four to six weeks later, before drawing conclusions. If both tests are abnormal, further evaluation is warranted.
How to Prepare for the Test
The World Health Organization recommends 2 to 7 days of sexual abstinence before providing a sample, while some European guidelines narrow that to 3 to 4 days. Too short an abstinence period can reduce volume and total count, while too long a period can increase the proportion of dead or sluggish sperm. Staying within that 2 to 7 day window gives the most representative snapshot.
The sample is collected through masturbation into a sterile container, usually at the lab or clinic so it can be analyzed within 30 to 60 minutes of collection. Some clinics allow home collection if you can deliver the sample quickly and keep it at body temperature during transport. Avoid lubricants unless the lab provides a sperm-safe option, as most commercial lubricants are toxic to sperm.
Quick Reference: Normal Ranges
- Volume: 1.5 mL or more
- Concentration: 15 million per mL or more
- Total sperm count: 39 million or more
- Total motility: 40% or more
- Progressive motility: 32% or more
- Total motile sperm count: 14 million or more
- Morphology (strict criteria): 4% normal forms or more
- Vitality: 58% live sperm or more
- pH: 7.2 to 8.0
- White blood cells: fewer than 1 million per mL
- Liquefaction time: within 20 to 25 minutes