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Infections after a prostate biopsy are rare, but they do occur. Now research shows that fewer than 2% of men develop confirmed infections after prostate biopsy, regardless of the technique used.

In the United States, doctors usually thread a biopsy needle through the rectum and then into the prostate gland while watching their progress on an ultrasound machine. This is called a transrectal ultrasound-guided biopsy (TRUS). Since the biopsy needle passes through the rectum, there's a chance that fecal bacteria will be introduced into the prostate or escape into the bloodstream. For that reason, doctors typically treat a patient with antibiotics before initiating the procedure.

Alternatively, the biopsy needle can be passed through the peritoneum, which is a patch of skin between the anus and the base of the scrotum. These transperitoneal prostate (TP) biopsies, as they are called, are also performed with ultrasound guidance, and since they bypass the rectum, antibiotics typically aren't required. In that way, TP biopsies help to keep antibiotic resistance at bay, and European medical guidelines strongly favor this approach, citing a lower risk of infection.

Study goals and methodology

TP biopsies aren't widely adopted in the United States, in part because doctors lack familiarity with the method and need further training to perform it. The technology is steadily improving, and TP biopsies are increasingly being conducted in office settings around the country. But questions remain about how TRUS and TP biopsies compare in terms of their infectious complications.

To investigate, researchers at Albany Medical Center in New York conducted the first-ever randomized clinical trial comparing infection risks associated with either method. The results were published in February in the Journal of Urology.

The Albany team randomized 718 men to either a TRUS or TP biopsy. Nearly all the men who got a TRUS biopsy (and with few exceptions, none of the TP-treated men) first received a single-day course of antibiotics. All the biopsies were administered between 2019 and 2022 by three urologists working at the Medical Center's affiliated and nonaffiliated hospitals.

The men were then monitored for fever, genitourinary infections, antibiotic prescriptions for suspected or confirmed infections, sepsis, and infection-related contacts with caregivers. Researchers collected data during a visit conducted two weeks after a biopsy procedure, and then by phone over an additional 30-day period following this initial meeting.

What the researchers found

According to the results, 1.1% of men in the TRUS group and 1.4% of men in the transperineal group wound up with confirmed infections. The difference was not statistically significant. If "possible" infections were counted (for example, antibiotic prescriptions for fever), then the rates increased to 2.6% and 2.7% of men in the TRUS and TP groups, respectively.

Fever was the most frequent complication, reported by six participants in each group. One participant from each group also developed noninfectious urinary retention, requiring the temporary use of a catheter. None of the men developed sepsis or required post-biopsy treatments for bleeding.

The study had some limitations: Nearly all the participants were white, and so the results may not be applicable to men from other racial and ethnic groups. Furthermore, since all the men were biopsied by a single institution, it's unclear if the findings are generalizable in other settings. Still, the study provides reassuring evidence that both types of biopsies "appear safe and viable options for clinical practice," the authors concluded.

Commentary from experts

"The paper provides needed evidence that TP biopsies without antibiotics are about as safe and efficacious as TRUS biopsies with antibiotics," said Dr. Marc Garnick, the Gorman Brothers Professor of Medicine at Harvard Medical School and Beth Israel Deaconess Medical Center. The findings also help to dispel a growing view that transperineal biopsies are superior, Dr. Garnick pointed out.

"Recent years have witnessed a marked interest and surge in the transperineal approach, primarily driven by early studies suggesting a lower risk of infectious complications compared with transrectal biopsy," said Dr. Boris Gershman, a urologist at Harvard-affiliated Beth Israel Deaconess Medical Center in Boston, and a member of Harvard Health Publishing's Annual Report on Prostate Diseases advisory board.

"Interestingly, the investigators find no difference in infectious complications, and it will be important to see if other ongoing studies report similar results," Dr. Gershman continued. "In addition to safety, we also need to confirm whether there are any meaningful differences between the two approaches with respect to cancer detection rates."

About the Author

Charlie Schmidt, Editor, Harvard Medical School Annual Report on Prostate Diseases

Charlie Schmidt is an award-winning freelance science writer based in Portland, Maine. In addition to writing for Harvard Health Publishing, Charlie has written for Science magazine, the Journal of the National Cancer Institute, Environmental Health Perspectives, … See Full Bio View all posts by Charlie Schmidt

About the Reviewer

Marc B. Garnick, MD, Editor in Chief, Harvard Medical School Annual Report on Prostate Diseases; Editorial Advisory Board Member, Harvard Health Publishing

Dr. Marc B. Garnick is an internationally renowned expert in medical oncology and urologic cancer. A clinical professor of medicine at Harvard Medical School, he also maintains an active clinical practice at Beth Israel Deaconess Medical … See Full Bio View all posts by Marc B. Garnick, MD

All of us have an internal clock that regulates our circadian rhythms, including when we sleep and when we are awake. And light is the single most important factor that helps establish when we should feel wakeful (generally during the day) and when we should feel sleepy (typically at night).

So, let me ask you a personal question: just how dark is your bedroom? To find out why that matters — and whether sleeping in an eye mask is worthwhile — read on.

How is light related to sleep?

Our circadian system evolved well before the advent of artificial light. As anyone who has been to Times Square can confirm, just a few watts of power can trick the brain into believing that it is daytime at any time of night. So, what’s keeping your bedroom alight?

• A tablet used in bed at night to watch a movie is more than 100 times brighter than being outside when there is a full moon.
• Working on or watching a computer screen at night is about 10 times brighter than standing in a well-lit parking lot.

Light exposure at night affects the natural processes that help prepare the body for sleep. Specifically, your pineal gland produces melatonin in response to darkness. This hormone is integral for the circadian regulation of sleep.

What happens when we are exposed to light at night?

Being exposed to light at night suppresses melatonin production, changing our sleep patterns. Compared to sleeping without a night light, adults who slept next to a night light had shallower sleep and more frequent arousals. Even outdoor artificial light at night, such as street lamps, has been linked with getting less sleep.

But the impact of light at night is not limited to just sleep. It’s also associated with increased risk of developing depressive symptoms, obesity, diabetes, and high blood pressure. Light exposure misaligned with our circadian rhythms — that is, dark during the day and light at night — is one reason scientists believe that shift work puts people at higher risk for serious health problems.

Could sleeping with an eye mask help?

Researchers from Cardiff University in the United Kingdom conducted a series of experiments to see if wearing an eye mask while sleeping at night could improve certain measures of learning and alertness.

Roughly 90 healthy young adults, 18 to 35 years of age, alternated between sleeping while wearing an eye mask or being exposed to light at night. They recorded their sleep patterns in a sleep diary.

In the first part of the study, participants wore an intact eye mask for a week. Then during the next week, they wore an eye mask with a hole exposing each eye so that the mask didn't block the light.

After sleeping with no light exposure (wearing the intact eye mask) and with minimal light exposure (the eye mask with the holes), participants completed three cognitive tasks on days six and seven of each week:

• First was a paired-associate learning task. This helps show how effectively a person can learn new associations. Here the task was learning related word pairs. Participants performed better after wearing an intact eye mask during sleep in the days leading up to the test than after being exposed to light at night.
• Second, the researchers administered a psychomotor vigilance test, which assesses alertness. Blocking light at night also improved reaction times on this task.
• Finally, a motor skill learning test was given, which involved tapping a five-digit sequence in the correct order. For this task, there was no difference in performance whether participants had worn an intact eye mask or been exposed to light at night.

What else did the researchers learn?

No research study is ever perfect, so it is important to take the conclusions above with a grain of salt.

According to sleep diary data, there was no difference in the amount of sleep, nor in their perceptions of sleep quality, regardless of whether people wore an eye mask or not.

Further, in a second experiment with about 30 participants, the researchers tracked sleep objectively using a monitoring device called the Dreem headband. They found no changes to the structure of sleep — for example, how much time participants spent in REM sleep — when wearing an eye mask.

Should I rush out to buy an eye mask before an important meeting or exam?

If you decide to try using an eye mask, you probably don’t need to pay extra for overnight shipping. Instead, follow a chronobiologist’s rule of thumb: “bright days, dark nights.”

• During the daytime, get as much natural daylight as you possibly can: go out to pick up your morning bagel from a local bakery, take a short walk during your afternoon lull at work.
• In the evening, reduce your exposure to electronic devices such as your cell phone, and use the night-dimming modes on these devices. Make sure that you turn off all unnecessary lights. Finally, try to make your bedroom as dark as possible when you go to bed. This could mean turning the alarm clock next to your bed away from you or covering up the light on a humidifier.

Of course, you might decide a well-fitted, comfortable eye mask is a useful addition to your light hygiene toolkit. Most cost $10 to $20, so you may find yourself snoozing better and improving cognitive performance for the price of a few cups of coffee.

About the Author

Eric Zhou, PhD, Contributor

Eric Zhou, PhD, is an assistant professor at Harvard Medical School. His research focuses on how we can better understand and treat sleep disorders in both pediatric and adult populations, including those with chronic illnesses. Dr. … See Full Bio View all posts by Eric Zhou, PhD