Pus Cells in Semen: Normal Range & When to Worry
Here is the straight answer on the normal range of pus cells in semen: a normal semen report shows up to 1 million peroxidase-positive white cells per millilitre — the WHO 6th-edition cut-off — which usually reads as roughly 1–4 round cells per high-power field (HPF). Most “pus cells” your lab reports are actually harmless round cells, not true infection. As a practising andrologist in Chennai, I get a message like this almost every day: a man photographs the line on his semen report that says “pus cells: 8–10/HPF,” and is convinced his fertility is finished and an infection is eating away inside him. Let me settle your nerves first, then give you the facts. In the large majority of these reports there is no infection and nothing to treat — the lab has simply counted round cells and called them pus. For the smaller number who do have a real problem, the fix is a targeted antibiotic course after a culture, not panic. Book a Consultation Most raised pus-cell counts on a semen report are harmless round cells, not infection. Quick Facts Normal is up to 1×10⁶ peroxidase-positive white cells/mL — the WHO 6th-edition threshold for true leukocytospermia (Dutta & Agarwal, 2025); on most Indian reports that corresponds to about 1–4 round cells per HPF. Not every “pus cell” is a white blood cell. Round cells in semen include both inflammatory cells (true pus) and immature sperm-making cells; you cannot tell them apart by eye, only with a peroxidase stain (Johanisson, 2000). Leukocytes in semen are common, not automatically a disease — found in about 30% of infertile men and up to 20% of fertile men (Henkel, 2024). White cells turn up even in proven-fertile sperm donors and these are linked to normal or improved fertilisation outcomes (Barraud-Lange, 2011). A genuine bacterial infection is the version that bites — it lowers sperm quality and raises sperm DNA fragmentation (Eini, 2021), which is exactly why a semen culture matters before antibiotics. What is the normal range of pus cells in semen? For most men I see, the honest answer is: lower than you fear. The internationally accepted reference is the World Health Organization’s: true leukocytospermia means more than 1 million peroxidase-positive leukocytes per millilitre of semen (Dutta & Agarwal, 2025). On the per-HPF count your Indian lab actually prints, that threshold usually works out to about 1–4 round cells per high-power field being well within normal. So a report of 2–4, or even an isolated 4–6, is rarely the catastrophe it feels like at 6 a.m. The trouble is that the two scales do not line up neatly. The WHO number is a concentration per millilitre measured with a stain; your lab’s number is a rough visual count per microscope field. That mismatch is why I always interpret the count alongside the rest of the full semen analysis report — the sperm count, the motility, and whether there is any clinical symptom — rather than reacting to one line in isolation. What “normal” actually means on your report Normal does not mean zero. A few white cells are part of a healthy ejaculate — they are housekeeping cells. What we are screening for is a count high enough, and a clinical picture suspicious enough, to suggest real inflammation or infection. A single number, divorced from your symptoms and the rest of the report, tells me very little. Why the lab reports a count per HPF Most Indian semen reports do a manual microscope count and express it as cells “per high-power field.” It is quick and cheap, but it cannot distinguish a neutrophil (a true pus cell) from an immature germ cell — both look like “round cells” down the eyepiece. That single limitation is behind most of the over-diagnosis I unwind in clinic. Round cells include harmless immature germ cells and true peroxidase-positive leukocytes — only a stain tells them apart. Pus cells vs round cells: the mix-up most reports make Here is the most important thing on this page. The cells your lab labels “pus cells” are more correctly called round cells, and round cells are a mixed bag. Some are genuine inflammatory white blood cells — neutrophils, lymphocytes, macrophages — and those are the true pus cells. But a large share are immature germ cells: young sperm-making cells shed normally from the testis. Under an ordinary microscope, the two look almost identical, and morphology alone cannot reliably tell them apart (Johanisson, 2000). So when a report says “8–10 pus cells/HPF,” what it very often means is “8–10 round cells/HPF” — and a good chunk of those may be harmless immature germ cells, not infection at all. Why not every “pus cell” is a true white blood cell To know whether those round cells are really leukocytes, the lab has to do a peroxidase test (also sold as a leuco-screen). Peroxidase-positive cells are true white cells; the rest are germ cells. Without that stain, a high “pus cell” count is an unconfirmed suspicion, not a diagnosis. This is precisely why I rarely treat a number alone — I treat a confirmed, symptomatic infection. What your exact pus-cell count means (2–4 to 20–25 per HPF) Searchers land here having typed their exact count, so let me give you the interpretation I use in clinic. Read this as a guide, not a verdict — the count is always weighed against your symptoms and the rest of the report. Pus cells in semen by count (per HPF) — likely meaning and what I do Count per HPF What it most likely means What I do 0–1 Completely normal Nothing — reassurance 2–4 Normal; well within WHO range Nothing — reassurance 4–6 Upper-normal; usually round cells, not infection Repeat sample after 3–4 days’ abstinence if symptomatic 8–10 Mildly raised; could be round cells or early leukocytospermia Peroxidase test ± semen culture only if symptoms 10–12 Raised; confirm whether truly leukocytes Peroxidase test + semen culture 20–25 Clearly high; true leukocytospermia likely