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DNA & Genetic Damage

Proliferation and cytogenetic studies in human blood lymphocytes exposed in vitro to 2450 MHz radiofrequency radiation.

No Effects Found

Vijayalaxmi, Mohan, N, Meltz, ML, Wittler, MA, · 1997

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Human blood cells showed no DNA damage after 90 minutes of microwave radiation exposure at levels higher than typical cell phone use.

Plain English Summary

Summary written for general audiences

Researchers exposed human blood cells to microwave radiation at 2450 MHz (the same frequency used in microwave ovens and WiFi) for 90 minutes to see if it would damage DNA or affect cell growth. They found no genetic damage, chromosome breaks, or changes in how fast the cells multiplied compared to unexposed cells. This suggests that short-term exposure to this type of radiation at these power levels may not immediately harm human blood cells.

Why This Matters

This 1997 study provides important data on whether microwave frequency radiation can cause immediate genetic damage to human immune cells. The exposure level of 12.46 W/kg SAR is significantly higher than what you'd experience from a cell phone (typically 1-2 W/kg), yet the researchers found no DNA damage or cellular toxicity within 72 hours. However, we must interpret these findings carefully. The study only examined short-term effects over three days, while real-world EMF exposure is chronic and occurs over years or decades. Additionally, this research focused solely on isolated blood cells in laboratory dishes, which cannot capture the complex biological responses that occur in living organisms. The science demonstrates that single studies, particularly those showing no effects, should not be viewed in isolation but rather as part of the larger body of evidence on EMF health effects.

Exposure Details

SAR
12.46 W/kg
Power Density
5 mW/cm²
Source/Device
2450 MHz RFR
Exposure Duration
90 min (30 min on and 30 min off, repeated three times).

Exposure Context

This study used 5 mW/cm² for radio frequency:

This study used 12.46 W/kg for SAR (device absorption):

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 5 mW/cm²Extreme Concern - 1,000 µW/m²FCC Limit - 10M µW/m²Effects observed in the Extreme Concern range (Building Biology)This level is 5 times the FCC limit
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2.45 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2.45 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

The aim of this study is to investigate Proliferation and cytogenetic studies in human blood lymphocytes exposed in vitro to 2450 MHz radiofrequency radiation.

Aliquots of human peripheral blood collected from two healthy human volunteers were exposed in vitro...

There were no significant differences between RFR-exposed and sham-exposed lymphocytes with respect ...

Thus, there is no evidence for an effect on mitogen-stimulated proliferation kinetics or for excess genotoxicity within 72 h in human blood lymphocytes exposed in vitro to 2450 MHz RFR.

Cite This Study
Vijayalaxmi, Mohan, N, Meltz, ML, Wittler, MA, (1997). Proliferation and cytogenetic studies in human blood lymphocytes exposed in vitro to 2450 MHz radiofrequency radiation. Int J Radiat Biol 72(6):751-757, 1997.
Show BibTeX
@article{vijayalaxmi_1997_proliferation_and_cytogenetic_studies_3466,
  author = {Vijayalaxmi and Mohan and N and Meltz and ML and Wittler and MA and},
  title = {Proliferation and cytogenetic studies in human blood lymphocytes exposed in vitro to 2450 MHz radiofrequency radiation.},
  year = {1997},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/9416798/},
}
PubMed: 9416798

Cited By (46 papers)

Quick Questions About This Study

A 1997 study found no DNA damage or genetic effects when human blood lymphocytes were exposed to 2450 MHz radiation for 90 minutes. The researchers detected no chromosome breaks, mitotic changes, or cellular abnormalities compared to unexposed cells at this microwave frequency.
Research shows 90-minute exposure to 2450 MHz microwave radiation does not cause chromosome damage in human blood cells. The study found no significant differences in chromosome breaks, genetic aberrations, or DNA fragments between exposed and control lymphocytes.
A laboratory study found both intermittent and continuous 2450 MHz exposure produced identical results in human blood lymphocytes. Neither exposure pattern caused DNA damage, chromosome breaks, or changes in cell division rates over 72 hours.
While 2450 MHz microwave radiation showed no genetic effects on human blood cells, gamma radiation at 150 cGy caused significant cellular damage in the same study. This demonstrates the blood cells could respond to truly harmful radiation.
Laboratory research found 2450 MHz radiation (the same frequency as WiFi) does not affect how fast human lymphocytes divide and multiply. Cell proliferation rates remained identical between microwave-exposed and unexposed blood samples after 72 hours.