Choosing the right vaginal speculum can make a big difference in patient comfort and clinical efficiency. Three common types—Auvard, Sims, and Pederson—look similar but serve very different purposes. This guide compares their design, uses, patient positioning, and pros and cons so you can select the best instrument for your practice.
What Are Auvard, Sims and Pederson Speculums?
These three speculums are all used in gynecology and obstetrics, but their shapes, blade configurations, and intended applications differ significantly. Understanding these differences helps clinicians perform exams and procedures more effectively while minimizing patient discomfort.
Auvard Speculum
The Auvard speculum is a weighted, single‑blade instrument used primarily in vaginal surgery. It has a heavy weight attached to the handle, which allows the blade to retract the posterior vaginal wall without requiring the assistant or surgeon to hold it constantly. This makes it ideal for longer procedures like vaginal hysterectomy, repair of prolapse, or extensive excisions. The blade is typically wider and longer than a Sims speculum.
Sims Speculum
The Sims speculum is a single‑blade, curved retractor held manually by the examiner. It was designed by Dr. James Marion Sims for examining the vagina and cervix, especially in the left lateral position. The blade retracts the posterior vaginal wall, allowing clear visualization of the anterior wall and cervix. It is commonly used in routine exams, IUD insertions, and colposcopy.
Pederson Speculum
The Pederson speculum is a bivalve (two‑blade) instrument similar to the Graves speculum but with narrower, less curved blades. It is designed for patients with a narrow vaginal introitus, such as post‑menopausal women or those with vaginismus. The blades are flat and smooth, reducing pressure on the anterior and lateral walls. It is commonly used for Pap smears and pelvic exams in sensitive patients.
Comparison Table: Auvard vs Sims vs Pederson
| Feature | Auvard Speculum | Sims Speculum | Pederson Speculum |
|---|---|---|---|
| Blade Type | Single blade, weighted | Single blade, curved | Bivalve (two blades), narrow |
| Patient Position | Lithotomy (for surgery) | Left lateral (Sims position) | Lithotomy or dorsal |
| Primary Use | Vaginal surgery (hysterectomy, prolapse repair) | Examination, IUD insertion, colposcopy | Pap smear, exams in narrow introitus |
| Hands‑Free? | Yes (self‑retaining via weight) | No (must be held) | No (held by examiner) |
| Visualization | Posterior and anterior walls | Anterior wall and cervix | Full vaginal canal and cervix |
| Common Sizes | Single size (adult) | Small, medium, large | Small, medium, large |
| Material | Stainless steel | Stainless steel (or disposable plastic) | Stainless steel (or disposable plastic) |
Detailed Comparison
Design and Blade Configuration
The Auvard speculum features a single, long, slightly curved blade attached to a heavy metal weight. This weight is placed over the patient’s thigh or hung off the table, providing stable retraction without manual effort. The blade is wide enough to retract the entire posterior vaginal wall, giving excellent exposure for surgical procedures.
The Sims speculum also has a single blade, but it is shorter, narrower, and has a distinct curve. It lacks a weight and must be held by the examiner. The blade is inserted along the posterior wall and rotated 90° to retract it downward. This design is ideal for quick examinations and minor procedures.
The Pederson speculum is a bivalve instrument with two blades that open laterally. Unlike the Graves speculum (which has wider, curved blades), Pederson blades are flat and narrow, reducing stretching of the introitus. It is held and opened by the examiner, allowing visualization of the entire vagina and cervix.
Clinical Applications
Auvard – Used in surgical settings: vaginal hysterectomy, anterior/posterior colporrhaphy, Manchester repair, and other reconstructive pelvic surgeries. Its self‑retaining nature frees up the surgeon’s hands for complex dissections and suturing.
Sims – Commonly used in office gynecology: routine pelvic exams, IUD insertions, colposcopy, cervical biopsies, and postpartum checks. The left lateral position is particularly useful for pregnant or obese patients.
Pederson – Ideal for patients with a narrow or sensitive introitus: post‑menopausal women, those with vulvodynia, vaginismus, or after radiation therapy. It is also a good choice for pediatric or adolescent exams.
Patient Positioning and Comfort
The Auvard speculum is used with the patient in the lithotomy position (legs in stirrups), which is standard for surgery. Because the weight holds the speculum, there is no constant pressure on the vaginal walls, but the procedure itself may cause discomfort.
The Sims speculum requires the patient to lie on her left side with knees bent toward the chest (Sims position). This position is often more comfortable for patients who have difficulty with lithotomy, and it reduces the need for deep retraction. The single blade places minimal pressure on the anterior wall.
The Pederson speculum also uses the lithotomy position, but the narrow blades cause less stretching of the introitus. For patients with vaginismus or severe tenderness, a Pederson speculum with a smooth, polished finish can be used with extra lubrication to minimize discomfort.
How to Choose the Right Speculum
When deciding which speculum to use, consider these factors:
- Procedure type: For vaginal surgery, choose Auvard. For routine exams and IUD insertions, Sims or Pederson. For Pap smears in narrow introitus, Pederson.
- Patient anatomy: Narrow introitus → Pederson. Retroverted uterus or difficult cervix → Sims. Normal anatomy → any, but Graves is often preferred for routine Pap.
- Patient comfort: If the patient has pelvic pain, vaginismus, or is anxious, start with Pederson or Sims in lateral position.
- Assistant availability: If you work alone, a self‑retaining Auvard or a bivalve speculum you can hold may be easier. Sims requires one hand to hold, which can be challenging if you need both hands.
- Availability and sterility: Reusable stainless steel instruments are durable, while disposable plastic speculums are convenient for single‑use.
Where to Buy High‑Quality Speculums
MR Surgical offers a range of premium stainless steel speculums suitable for all clinical settings. Our Sims vaginal speculum is available in multiple sizes with fenestrated or solid blade options. We also carry Pederson speculums and Auvard weighted speculums (if you need them, check our speculum collection). All instruments are designed to meet international standards and are fully autoclavable.
For a detailed guide on using the Sims speculum, read our complete Sims speculum guide.
Frequently Asked Questions
Can a Sims speculum be used instead of an Auvard for surgery?
No. The Sims speculum is not weighted and must be held manually, making it impractical for lengthy surgical procedures. Auvard is specifically designed for self‑retaining exposure in vaginal surgery.
What is the main difference between Pederson and Graves speculums?
Pederson blades are narrow and flat, ideal for narrow introitus. Graves blades are wider and curved to accommodate the natural shape of the vagina, making them better for routine Pap smears in average‑sized patients.
Which speculum is best for a patient with a retroverted uterus?
The Sims speculum in the left lateral position often provides the best view of a retroverted uterus because it lifts the posterior wall, allowing the cervix to drop into view. Alternatively, a bivalve speculum with a long, angled blade may also work.
Are these speculums reusable or disposable?
All three types are available in both reusable stainless steel and single‑use disposable plastic versions. Reusable instruments require proper cleaning and autoclaving.
How do I choose the correct size?
For Auvard, one size fits most adults. For Sims and Pederson, start with medium (adult) and have small and large available for pediatric or large‑framed patients.
References & Further Reading
- ACOG Clinical Guidelines – Pelvic Examinations
- NCBI – Vaginal Speculum Examination
- WHO – Reproductive Health Instruments
- Comparison of vaginal speculums: a systematic review (PubMed)
Disclaimer: This guide is for educational purposes only. Always follow your institution’s protocols and manufacturer’s instructions.
