Bad Semen Analysis? What Your Numbers Mean and What to Do in the Next 90 Days

Reviewed by Dr. Dimberg, reproductive endocrinologist.

For two years, it was hers to fix. The apps, the tests, the appointments, the temperature charts. Then your result came back, and the GP or clinic spent eight minutes on it: "a bit low", "keep them cool", maybe the word IVF.

You walked out with a sheet of numbers and no plan.

This guide fixes that. Here's what every number on your semen analysis means, why one test is not a verdict, and exactly what to do in the 90 days before your retest. That's the window where your next result is actually decided.

First: one result is not your result

Sperm numbers swing a lot from sample to sample. Illness, a fever weeks earlier, a short or long gap since you last ejaculated, stress, alcohol, even how the sample was collected can move the numbers. A single sample can read well below your true average.

That's why the WHO laboratory manual and NICE guidance in the UK both work on repeat testing. NICE recommends a repeat confirmatory test if the first is abnormal, ideally 3 months later, because that's how long it takes to make a new batch of sperm.

So read your first result as a starting point, not a sentence.

What the numbers mean

Below are the WHO reference limits (6th edition, 2021). They're the lower end of what's found in fertile men, not a pass mark for "fertile" or "infertile". Plenty of men below them still conceive, and some above them don't.

The words on your report, in plain English

• Oligozoospermia: low count
• Asthenozoospermia: low motility (slow or poor swimmers)
• Teratozoospermia: low normal morphology (shape)
• Oligoasthenoteratozoospermia (OAT): all three low at once
• Azoospermia: no sperm found in the sample. This needs a urologist, not a supplement. Book a specialist referral.

The three numbers that matter most

Most men's reports come down to three things, and it helps to think of them simply:

1. Count: how many
2. Speed (motility): how well they swim
3. Shape (morphology): how they're built

Your partner's clinic may also mention TMSC (total motile sperm count): volume x concentration x progressive motility. It's often what decides between trying naturally, IUI or IVF, so it's worth knowing your number.

Why your numbers came back low

Sometimes there's a clear medical cause, and those need a doctor:

• Varicocele (enlarged veins in the scrotum), one of the most common treatable causes
• Hormone problems, including past or current testosterone, TRT or steroid use, which can shut down sperm production
• Infections, injuries or previous surgery
• Some medications, including finasteride for some men

Often, though, there's no single cause, and the result reflects everyday load: heat, smoking, alcohol, poor sleep, excess weight, stress, and nutrition that doesn't supply what sperm production uses. That last group is where the next 90 days come in.

Why 90 days is the window that matters

Sperm take roughly 74 days to make, plus time to mature and travel. That means:

• The sperm in your last test were made around 3 months ago.
• The sperm on your next test don't exist yet.
• What you do from today is what your retest will measure.

That's good news. It means your next result isn't fixed. You get a full cycle to change the inputs before anyone measures again.

Your 90-day plan

1. Stop the obvious damage

• Smoking and vaping: stop. It's one of the most consistent links to poor sperm quality.
• Alcohol: cut it right down for the 90 days.
• Heat: avoid hot tubs, saunas and long hot baths, and keep the laptop off your lap.
• Sleep: aim for 7 to 8 hours. Poor sleep is linked to lower semen quality.
• Weight: if you're carrying extra weight, even a modest loss helps hormones.
• Testosterone, TRT or "T boosters" with hormones: don't start them while trying. If you're already on them, speak to your doctor before changing anything, because external testosterone can switch sperm production off.

2. Supply what sperm production actually uses

Making millions of new sperm a day takes specific raw materials, and the research points to the same handful again and again:

• For speed: CoQ10 (trials used 200 to 400mg a day) and carnitine
• For count: zinc (around 30mg), vitamin D, selenium
• For shape: selenium (100 to 200mcg), methylfolate, B12, B6, vitamins C and E

The honest picture: studies show these nutrients improving individual semen numbers, mostly in small trials. No supplement has been proven to raise live birth rates on its own (Cochrane 2022; MOXI trial 2020). But you're going to retest in 90 days either way, and these are the inputs the research measured.

Check the doses. Many men's fertility tablets list these ingredients at a tiny fraction of the trial dose, or hide them in a "proprietary blend". Our comparison shows the gap: Best Male Fertility Supplements UK: 7 Compared by the Dose. For the strongest single ingredient, read CoQ10 for Sperm: The 200mg Dose the Studies Used.

3. Be consistent for the full cycle

Most men quit in week three because they "don't feel any different". You won't feel it. Sperm quality isn't something you notice day to day. Set a daily habit (with breakfast is easiest) and don't break it until the retest.

4. Retest properly

• Book your repeat test about 90 days after you start.
• Follow the lab's abstinence instructions exactly (usually 2 to 7 days), and keep the gap similar to your first test so the results are comparable.
• Compare count, progressive motility and morphology with the first report, line by line.

When to see a specialist straight away

Don't wait 90 days if any of these apply. Ask your GP for a urology or andrology referral:

• No sperm found (azoospermia) or a very low count (under about 5 million per mL)
• A lump, pain or swelling in the testicles
• Past testosterone or steroid use, or symptoms of low testosterone
• Your partner is 35 or older and you've been trying for 6 months or more

Before you're pushed into IVF

Private IVF in the UK costs £5,000+ per cycle, and the male side is often treated as an afterthought: "keep them cool and try IVF." If you haven't started treatment yet, the next 90 days are the cheapest window you'll ever get to improve your numbers. Walk into that next appointment with the best result you can build.

Where SPERMFUEL+ fits

We built SPERMFUEL+ for exactly this 90-day window: 14 fertility nutrients in 2 capsules a day, at the doses the research points to, with every dose printed on the label.

• Speed: CoQ10 200mg, acetyl-L-carnitine 440mg
• Count: zinc 30mg, vitamin D3 4,000 IU, boron 10mg
• Shape: selenium 200mcg, methylfolate 800mcg, methyl-B12 48mcg, B6 (P5P) 8.5mg, vitamins C and E

It comes with a 120-day money-back guarantee, long enough to cover a full sperm cycle and your retest. See the full label.

FAQ

What is a normal sperm count? The WHO lower reference limit is 16 million sperm per mL, or 39 million per ejaculate. Below that is called oligozoospermia, but many men below it still conceive.

Can a bad semen analysis be wrong? A single sample can read well below your true average, which is why repeat testing is standard. NICE suggests a repeat test about 3 months after an abnormal result.

How long does it take to improve sperm count? Sperm take roughly 74 days to develop, so changes show up on a retest about 3 months later.

What does low motility mean? Fewer sperm are swimming forwards. The WHO lower reference limit for progressive motility is 30%.

Should I retest before starting IVF? If you haven't started treatment, retesting after 90 days of changes gives you and your clinic a clearer picture. Ask your clinic about timing.

References

1. World Health Organization. WHO laboratory manual for the examination and processing of human semen, 6th edition. 2021. Source
2. NICE. Fertility problems: assessment and treatment (CG156). National Institute for Health and Care Excellence. Source
3. Bakri S et al. Efficacy and Safety of Coenzyme Q10 in Idiopathic Male Infertility: A Systematic Review and Meta-Analysis of Randomized Trials. World J Mens Health, 2026. PubMed
4. Lenzi A et al. A placebo-controlled double-blind randomized trial of the use of combined l-carnitine and l-acetyl-carnitine treatment in men with asthenozoospermia. Fertil Steril, 2004. PubMed
5. Scott R et al. The effect of oral selenium supplementation on human sperm motility. Br J Urol, 1998. PubMed
6. de Ligny W et al. Antioxidants for male subfertility. Cochrane Database Syst Rev, 2022. PubMed
7. Steiner AZ et al. The effect of antioxidants on male factor infertility: the Males, Antioxidants, and Infertility (MOXI) randomized clinical trial. Fertil Steril, 2020. PubMed
8. Michaelsen MP et al. The Effect of Dietary Supplements on Male Infertility in Terms of Pregnancy, Live Birth, and Sperm Parameters: A Systematic Review and Meta-Analysis. Nutrients, 2025. PubMed