“No SPM detected” on a urinalysis report means no sperm were found in your urine sample. SPM is a shorthand abbreviation some laboratories use for “sperm” when reporting microscopic findings from a urine test. This is a normal result for the vast majority of people and generally nothing to worry about.
Why Sperm Appears on a Urinalysis Report
When a lab processes a urine sample, a technician examines the sediment under a microscope. They’re looking for things like red blood cells, white blood cells, bacteria, crystals, and other cellular material. Sperm cells can show up during this microscopic analysis, so most labs include a line item for it on the report. If none were seen, the result reads “no SPM detected,” “SPM: none seen,” or something similar.
Sperm showing up in urine is uncommon. In one study of over 20,000 urinary sediment samples, only 1.6% contained any sperm at all. So a “none detected” result puts you squarely in the majority.
When Sperm Would Be Found in Urine
There are a few situations where sperm can turn up in a routine urine test. The most common is simple timing: if a man provides a urine sample shortly after ejaculation, residual sperm in the urethra can wash into the specimen. This is harmless and has no medical significance.
In older men, sperm sometimes appear in urine because the internal sphincter at the bladder neck doesn’t close as tightly as it once did. Again, this is typically a normal age-related change rather than a sign of disease.
The one situation where sperm in urine does matter clinically is retrograde ejaculation, a condition where semen travels backward into the bladder instead of exiting through the penis during orgasm. A large number of sperm in a post-ejaculation urine sample is one of the key ways this condition is diagnosed. Retrograde ejaculation can be a factor in male infertility, so doctors sometimes order a specific post-ejaculatory urine test to check for it. A routine urinalysis showing “no SPM detected” effectively rules this out for that sample.
What “No SPM Detected” Means for You
If you’re reviewing a standard urinalysis and this line caught your eye, you can treat it the same way you’d treat “no bacteria detected” or “no crystals seen.” It’s simply the lab confirming they didn’t find something they routinely check for. No follow-up is needed based on this result alone.
If you’re a man undergoing a fertility evaluation and your doctor specifically ordered a post-ejaculatory urine analysis, “no SPM detected” would mean no sperm were found traveling backward into your bladder, which is a good sign in that context. Your doctor would interpret this alongside your semen analysis and other results.
Other Meanings of SPM
In other areas of medicine and biology, SPM can refer to specialized pro-resolving mediators, a group of molecules involved in controlling inflammation. However, this meaning would never appear on a standard urinalysis report. If you’re seeing “no SPM detected” on a urine test, it refers to sperm.