How Useful Are At-Home PSA Tests for Detecting Prostate Cancer?

When you hear prostate cancer is the most common cancer among men in the United States (outside skin cancer), you figure it’s a good practice to screen whenever possible, even at home.

But screening for prostate cancer is complex, and the methods we have now aren’t cut-and-dried. What we test for — prostate-specific antigen (PSA) levels — aren’t direct links to prostate cancer, so PSA tests are only part of a much larger screening picture.

At our men’s health practice, board-certified urologist Dr. Robert J. Cornell regularly helps men navigate prostate cancer, which is diagnosed in nearly 13% of the adult male population. Drawing on that expertise, here are some key considerations for at-home PSA testing.

What PSA testing can, and cannot, tell us

As we mentioned earlier, PSA testing doesn't paint the whole picture when it comes to prostate cancer. Let’s dive into that a bit more.

Measuring PSA levels is only a first step

We measure PSA levels in nanograms per milliliter (ng/mL) and use general guidelines for these measurements. For example, a reading above 4 ng/mL is widely considered to be higher than we like to see and likely warrants further investigation.

That said, it’s not that simple. Other factors influence this reading, such as:

• Age
• Health
• Prior history of prostate cancer
• Medications or health issues that can affect PSA levels

As a result of these factors, some men with higher PSA levels don’t end up with prostate cancer, while some men with PSA levels below 4 ng/mL can still have the disease. 

PSA results are nuanced

Complicating matters even more, PSA exists in two different forms, including:

• Percent-free PSA that’s unattached to proteins 
• Complexed PSA that’s attached to proteins

When we refer to PSA levels, we usually mean total PSA, but the ratio between these two forms influences how we interpret the results.

The point is that PSA testing is far from conclusive. For that, we use PSA tests to guide us before turning to further testing and biopsies.

Benefits and drawbacks of at-home PSA testing

At-home PSA testing is certainly convenient: You can conduct a PSA test yourself with a skin prick. Once you collect your blood sample, you send it or drop it off at a lab for testing, and the results go directly to you and any medical provider you indicate.

The at-home test can also save you time. The testing itself isn’t any different, so results won’t vary between at-home testing and the testing we do here.

That said, with in-office PSA testing, you’ll have an expert team at your disposal to answer any questions. We can also advise on when you should test — and perhaps more importantly — when you shouldn’t. 

In other words, doing a PSA test yourself may cause unnecessary anxiety, especially if you don’t know how to interpret the results in combination with your unique circumstances. 

Get personalized guidance on your PSA levels

If you have more questions about PSA testing, whether at-home or here at our practice, we’re happy to answer them. To consult with one of our team members, please contact our Houston office today to schedule an appointment.