Aquablation vs. TURP: How Do They Compare?

If you’re researching surgery for an enlarged prostate, you’ve almost certainly run into these two names. TURP — transurethral resection of the prostate — has been the gold standard for decades. Aquablation is the newer, robotic alternative. I perform Aquablation at Swedish in Seattle, and patients ask me some version of this question every week: is the new one actually better, or just newer?

The honest answer: both are excellent operations for the right patient, and the differences that matter are specific and knowable. Here’s how I walk through it in clinic.

What each procedure actually does

Both procedures do the same fundamental job: they remove the inner prostate tissue that’s squeezing your urethra shut, reopening the channel so your bladder can empty normally. Both are done through the urethra — no incisions. The difference is how the tissue is removed.

TURP uses an electrified wire loop. Working through a scope, the surgeon shaves away obstructing tissue piece by piece, judging depth and boundaries by eye and experience. In skilled hands it’s a very good operation — it’s the standard against which everything else is measured for a reason.

Aquablation removes tissue with a high-velocity jet of sterile water, guided robotically. Before any tissue is removed, the surgeon maps the treatment on a live ultrasound image of your specific prostate — marking exactly what to remove and what to protect, including the sphincter that keeps you dry and the structures near the bladder neck involved in ejaculation. The robot then executes that plan with the surgeon supervising closely.

That mapping step is the heart of the difference: TURP’s precision depends on what the surgeon can see through the scope in the moment; Aquablation’s is planned on cross-sectional imaging before the first pass.

Symptom relief: effectively a tie

This surprises people. In the WATER trial — a randomized, double-blind, head-to-head comparison — Aquablation matched TURP’s symptom relief, and both were dramatic: severe symptom scores dropping into the normal range, flow rates roughly doubling. Five-year follow-up shows both holding up, with low retreatment rates.

So if the only question were “will my stream and my sleep improve?” — you could choose either and do well. The real differences are elsewhere.

Sexual function: the clearest difference

After TURP, retrograde ejaculation is the expected outcome — semen flows backward into the bladder rather than forward, permanently, in the majority of men. Erections are typically unaffected, and it isn’t harmful, but for many men it matters a great deal.

After Aquablation, most men keep normal ejaculation, because the ultrasound map deliberately spares the tissue responsible for it. This was a key finding of the randomized data: equivalent symptom relief with substantially less ejaculatory dysfunction.

If preserving ejaculation is a priority for you, this difference alone usually settles the question. If it isn’t — and for plenty of men it isn’t — TURP loses nothing on this front.

Bleeding: TURP’s cautery advantage, mostly neutralized

TURP’s electrified loop cauterizes as it cuts, which historically gave it an edge on bleeding. The waterjet doesn’t generate heat — which is exactly why it can preserve function so precisely — so bleeding was the early concern with Aquablation.

Technique has largely closed that gap. I cauterize all visible bleeding points directly after the ablation (a focused approach I learned from Dr. Mihir Desai at USC), and with that, most of my patients go home the same day without bladder traction. Meaningful bleeding requiring transfusion is uncommon with either operation today, though it remains on the honest risk list for both.

Gland size: where each one fits

• TURP is most efficient in small-to-average glands — roughly under 80 mL. Beyond that, resection time under anesthesia grows and efficiency falls.
• Aquablation handles roughly 30–100 mL comfortably — the robot doesn’t get slower or less precise as glands grow within that range.
• Beyond ~100–150 mL, I usually recommend single-port robotic simple prostatectomy — removing the obstructing tissue completely rather than ablating it.

Recovery: similar shape, slightly different pace

Both are hospital procedures under anesthesia. With Aquablation, most of my patients go home the same day with a catheter for 2–3 days; desk work at 3–5 days; full activity around two weeks. TURP typically means a night in the hospital with a catheter for a similar stretch, and a comparable overall arc. Both involve a few weeks of urgency and burning while the treated channel heals, and both deliver a noticeably stronger stream the day the catheter comes out.

Track record vs. modern data

Fairness requires saying it plainly: TURP has a 50-year track record; Aquablation’s data extends about a decade. But Aquablation’s evidence is unusually strong for a newer procedure — FDA clearance came through a randomized trial against the gold standard itself, not a single-arm study, and durability now runs past five years. This isn’t an experimental technology; it’s a well-studied one that simply arrived recently.

So which one should you choose?

My honest framework:

• Choose Aquablation if your gland is in the 30–100 mL range and preserving ejaculation matters to you — or if you simply want the most anatomically precise version of this operation.
• TURP remains a sound choice if ejaculation isn’t a concern for you, your gland is modest in size, or your circumstances favor the longest track record.
• Neither is right if your gland is very large — that’s simple prostatectomy territory, and treating a 150 mL gland with the wrong tool is how patients end up needing a second procedure.

The most important variable isn’t the technology — it’s whether your surgeon offers more than one option. I perform Aquablation and simple prostatectomy, and I refer appropriately when something else fits better. That’s the position I’d want my own family member’s surgeon to be in: recommending from the full menu, not from the one dish on it.

If you’d like to go deeper on the procedure itself, start with my complete Aquablation guide — candidacy, step-by-step, recovery, and the questions patients ask most.