Does EMF Lower Testosterone or Harm Human Sperm Quality

Does EMF Lower Testosterone or Sperm Quality?

The best human reviews rate the evidence on phone radio waves and sperm as very uncertain, and testosterone effects in humans are unproven. A 2024 WHO-commissioned review examined nine human observational studies on mobile phone exposure. Seven studies covered the general public, and two were occupational. The review concluded that the evidence identified is very uncertain about the effect of radio-frequency exposure from mobile phones on sperm outcomes.

A 2021 review by Maluin and colleagues states that RF radiation from mobile phones and Wi-Fi devices 'can cause testosterone reduction'. The review combines animal and human data, and its abstract gives no human-only breakdown. A 2005 study recorded a 2.8 C temperature rise on the right side of the scrotum during working laptop use and 2.1 C from sitting alone. The study did not test radio waves.

The Food and Drug Administration (FDA) states that there is no established health benefit from reducing an individual's RF exposure from cell phones. The Wi-Fi radiation guide covers Wi-Fi radiation at home.

What the Sperm Studies Report

In the 2024 WHO-commissioned review led by Kenny and colleagues, researchers analysed nine human observational studies. Of four motility studies reviewed, only one identified a statistically significant effect. A 2024 WHO-commissioned review led by Cordelli and colleagues assessed 117 animal papers and 10 human in-vitro studies. Human sperm exposed in dishes showed a small detrimental effect on vitality, rated very low certainty, with no effect on DNA or chromatin. The authors write that most studies used exposure levels higher than the levels to which human populations are typically exposed. They concluded that the evidence did not allow firm conclusions on most endpoints. The animal data are not evidence about people.

Two earlier meta-analyses published in 2014 arrived at conflicting conclusions. A 2014 meta-analysis by Adams et al. evaluated ten studies with 1,492 samples across in-vitro and observational designs. They found exposure associated with reduced sperm motility, with a mean difference of -8.1% (95% CI -13.1 to -3.2). Viability showed a mean difference of -9.1% (95% CI -18.4 to 0.2), an interval that crosses zero. Sperm concentration outcomes were more equivocal in their dataset. The authors called for further study of clinical implications.

A second 2014 meta-analysis by Liu et al. examined 18 studies and reported different conclusions. They found no adverse effects on semen parameters in human studies, while in-vitro studies pooled to lower motility and viability. The two 2014 meta-analyses disagree. The reviews as summarised here do not state why they differ.

Phone in the Pocket and Sperm

A WHO-commissioned review found there may be no or little effect of carrying a mobile phone in the front pocket on sperm concentration, total count or morphology, and rated the certainty very low. The authors noted there may be no or little effect on progressive motility or time to pregnancy. Across four motility evaluations in that review, only one identified a statistically significant effect.

The 5G health effects guide covers the HHS review.

Testosterone and Radio Waves

Whether radio waves lower testosterone in men is unproven. A 2021 review that addresses the question mixes animal and human data. A 2021 review by Maluin et al. states that RF radiation from mobile phones and Wi-Fi devices 'can cause testosterone reduction'. The authors also reported that effects on luteinizing hormone and follicle-stimulating hormone are 'inconclusive'. Its abstract provides no human-only breakdown and no numbers.

No WHO-commissioned review of RF exposure and serum testosterone was found here. The low testosterone in young men guide covers causes.

Heat From a Laptop on Your Lap

Heat from a laptop on the lap is the better-documented mechanism. In a 2005 study of 29 healthy volunteers by Sheynkin et al., scrotal temperature rose 2.8 C on the right and 2.6 C on the left with a working laptop on the lap. In the same seated posture without a laptop, scrotal temperature rose 2.1 C. The laptop temperature rise was higher, with P<0.0001.

The authors attribute the rise to heat exposure and posture-related effects. They write that scrotal warming 'may have a negative impact upon spermatogenesis' and call for further studies. In the laptop study, temperature rose 2.1 C from sitting alone and 2.8 C with the laptop on the lap. Most of the rise came from posture and heat trapped between the legs. The study did not test radio waves at all.

How to Find Out for Yourself

A semen analysis and a morning total testosterone test are the two ways to check your own numbers. According to MedlinePlus, a semen analysis measures the quantity and quality of semen and sperm. Because parameters can vary from day to day, you may need multiple samples. The AUA/ASRM male infertility guideline says clinicians should include one or more semen analyses in the initial evaluation of a male. Because semen parameters vary, at least two semen analyses obtained a month apart are important to consider, especially if the first has abnormal parameters. The guideline recommends hormonal evaluation for infertile males with impaired libido, erectile dysfunction, very low sperm counts, atrophic testes or hormonal abnormality on exam.

For hormone levels, MedlinePlus notes that the blood sample is usually taken in the morning between 7 and 10. Levels are typically highest then. The Endocrine Society recommends measuring fasting morning total testosterone concentrations using an accurate and reliable assay as the initial diagnostic test. They recommend confirming the diagnosis by repeating the measurement of morning fasting total testosterone. Diagnosis of hypogonadism requires symptoms and signs consistent with deficiency and unequivocally, consistently low testosterone.

The AUA testosterone guideline uses total testosterone below 300 ng/dL as a reasonable cut-off. The AUA requires two morning measurements on separate occasions. The two guidelines differ on fasting. The AUA does not recommend that clinicians insist on fasting prior to testing. The hormone testing page covers hormone testing and the free testosterone biomarker page covers free testosterone.

What Would Change This Answer

A human study that measures each participant's radio-frequency exposure and records both semen analysis results and morning total testosterone would change this answer. Until then, the human evidence on phones and sperm is very uncertain and testosterone effects are unproven.

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