Ring Pessary Size Guide — Sizes 0–9 (44–102 mm) Explained
Ring pessary size guide: sizes 0–9 (44–102 mm) explained.
A practical reference for patients and clinicians on ring pessary sizing. Standardized US ring pessary sizes, the most commonly fitted ranges, and how to work with your gynecologist to find the right size.
Standardized ring pessary size chart
Ring pessaries are sized by outer diameter. US clinical convention uses size numbers 0 through 9, with each step roughly 6–7 mm larger than the last. The chart below shows the full SciMed range.
| Size | Diameter (mm) | Diameter (in) | Typical use |
|---|---|---|---|
| 0 | 44 mm | 1.75 in | Very small introitus |
| 1 | 51 mm | 2.00 in | Small introitus |
| 2 | 57 mm | 2.25 in | Smaller-than-average |
| 3 | 64 mm | 2.50 in | Common starting size |
| 4 | 70 mm | 2.75 in | Most commonly fitted |
| 5 | 76 mm | 3.00 in | Most commonly fitted |
| 6 | 83 mm | 3.25 in | Larger-than-average |
| 7 | 89 mm | 3.50 in | Larger introitus |
| 8 | 95 mm | 3.75 in | Post-vaginal-delivery, larger |
| 9 | 102 mm | 4.00 in | Largest available |
Highlighted rows (sizes 3–5) are the most commonly fitted sizes in US gynecology practice for first-time pessary users.
How clinical fitting works
Pessary fitting is a brief in-office procedure performed by a gynecologist or urogynecologist. The four-step process below is what most US providers follow.
Pelvic exam
Your provider examines for prolapse stage, vaginal length, and introital width.
Fitting trial
A fitting kit is used to trial sizes — typically starting around size 3 or 4.
Walk & valsalva
You walk, cough, and bear down to confirm the pessary stays in place comfortably.
Confirm size
Once a comfortable, retentive fit is confirmed, you order that size for daily use.
When to size up or down
Pessary fit can change over time — with weight change, after pelvic floor physical therapy, or following pelvic surgery. Here's how to recognize when a different size may help.
↑Consider sizing up if…
- The pessary falls out with movement, coughing, or bowel movements
- You feel persistent dragging or descent of the prolapse
- You can easily remove it without folding
- Your provider notes the device is rotating or shifting on exam
↓Consider sizing down if…
- You feel pressure, pinching, or pain when seated or walking
- Removal is difficult or causes discomfort
- You experience new urinary urgency or difficulty voiding
- The vaginal wall shows redness or irritation at follow-up
Common sizing mistakes to avoid
Ordering by guesswork before any fitting
Pessaries cannot be sized accurately from external measurements or symptoms alone. A clinical fitting exam is required for first-time users.
Choosing "in between" sizes
Each size step is roughly 6–7 mm. There is no half-size; if you're between 4 and 5, your provider will trial both and pick the more retentive comfortable fit.
Sizing up "just to be safe"
An oversize pessary causes pressure, urinary symptoms, and tissue irritation. The smallest size that holds reliably is the right size.
Not re-checking fit annually
Vaginal anatomy changes with age, weight, and surgery. A yearly fit check is recommended even if your current pessary feels fine.
Order your size
Once your provider has confirmed your size, order direct from SciMed at manufacturer pricing. Same-day US dispatch on orders placed before 2 PM ET, in plain discreet packaging.
Ring Pessary With Support
Ring Pessary Without Support
Combo Pack — With Support
Combo Pack — Without Support
Frequently asked questions
What size pessary do most women use?
In US gynecology practice, sizes 3, 4, and 5 (64–76 mm) are the most commonly fitted ring pessaries. Younger women without prior vaginal delivery often fit smaller; women post-vaginal-delivery and post-menopausal often fit larger.
Can I fit myself at home?
No. First-time pessary fitting requires a clinical pelvic exam and a fitting trial. Self-fitting risks an incorrect size that causes pressure injury, urinary symptoms, or pessary expulsion.
What's the difference between with-support and without-support?
The with-support ring includes a thin silicone membrane that helps support the bladder in patients who have a coexisting cystocele (anterior wall prolapse). Without-support is a simple open ring used when there is no cystocele.
Will my size change over time?
It can. Weight change of 10 lb or more, pelvic floor physical therapy, vaginal estrogen therapy, or pelvic surgery can all change pessary fit. A yearly fit check is recommended.
Is the size on the package the same as the diameter?
The size number (0–9) is a clinical convention. The actual outer diameter in millimeters is printed on each unit's pouch alongside the size number, lot, and expiration date.
What if my fitting size isn't in stock anywhere else?
SciMed stocks all 10 sizes (0–9) continuously. Most US suppliers stock five or six common sizes. If your provider has fitted you to a less-common size, we can ship same business day.
Need help finding your size?
Our team can confirm sizing details, provide clinical references, and ship to your provider's office on request.
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