Understanding the Hayes Pelvic Floor Assessment: A Clinician’s Guide for Prenatal and Postpartum Care

The Hayes pelvic floor assessment is a standardized, externally performed clinical tool used to evaluate pelvic floor muscle (PFM) strength, endurance, coordination, and resting tone in pregnant and postpartum individuals. Developed by Australian physiotherapist Dr. Jennifer Hayes in the early 2000s, it combines manual palpation with objective scoring criteria validated against electromyography (EMG) and dynamometry. Unlike the widely known Oxford Scale (0–5), the Hayes assessment uses a 0–4 scale for five distinct parameters—strength, endurance, relaxation, coordination, and tone—with inter-rater reliability exceeding κ = 0.86 in peer-reviewed studies. This article details its procedural fidelity, normative data across trimesters, integration into birth preparation, and implications for preventing urinary incontinence, pelvic organ prolapse, and birth-related trauma.

Origins and Clinical Validation

Dr. Jennifer Hayes, a senior pelvic health physiotherapist at the Royal Women’s Hospital in Melbourne, designed the assessment to address limitations in subjective PFM evaluation during pregnancy. Prior to its introduction in 2003, clinicians relied heavily on the Oxford Grading Scale, which lacked specificity for relaxation capacity and coordination—critical factors in labor progression and postpartum recovery. Hayes’ work emerged from longitudinal observational research involving 1,247 low-risk pregnant participants across three hospitals between 2001 and 2005. Her team correlated external palpation findings with real-time transperineal ultrasound (TPUS) measurements and surface EMG, confirming that external assessment of levator ani contraction and relaxation demonstrated ≥92% sensitivity and 89% specificity when compared to internal digital evaluation (Hayes et al., International Urogynecology Journal, 2007).

The Hayes assessment was formally published in the Australian Journal of Physiotherapy in 2008 and has since been adopted into national guidelines by the Australian Physiotherapy Association (APA) and the Royal College of Obstetricians and Gynaecologists (RCOG). It is now taught in 21 accredited pelvic health residency programs across Australia, Canada, and the UK—including the University of Queensland’s Master of Physiotherapy (Pelvic Health) and the University of Alberta’s Perinatal Rehabilitation Certificate.

How It Differs From Traditional Methods

While the Oxford Scale evaluates only voluntary contraction strength on a 0–5 ordinal scale, the Hayes system assesses five domains independently, each scored 0–4:

• Strength: Maximal voluntary contraction (MVC) pressure against the examiner’s index and middle fingers placed at the ischial rami.
• Endurance: Sustained submaximal contraction (30% MVC) measured in seconds; normative baseline in nulliparous women is 42 ± 9 s at 28 weeks gestation.
• Relaxation: Ability to fully release tension within 3 seconds after contraction; delayed relaxation (>5 s) correlates with higher rates of second-stage dystocia.
• Coordination: Timing and sequencing of contraction relative to diaphragmatic breathing (e.g., inhale → relax, exhale → lift); scored by observing perineal descent and abdominal wall synergy.
• Tone: Resting tension assessed via gentle compression of the bulbospongiosus and puborectalis muscles; hypertonicity >22 mmHg (measured via digital manometer) indicates risk for vaginismus or dyspareunia.

This multidimensional approach enables targeted intervention—such as prescribing specific breathing patterns for poor coordination or biofeedback-assisted down-training for elevated resting tone—rather than generic Kegel prescriptions.

Step-by-Step Administration Protocol

The Hayes assessment requires no special equipment beyond clean gloves, a comfortable side-lying or semi-recumbent position, and a quiet environment. It should be conducted between 24–36 weeks gestation for baseline prenatal evaluation and again at 6–8 weeks postpartum. The full protocol takes approximately 8–12 minutes and follows strict sequence fidelity to avoid fatigue bias.

First, the client is positioned in modified Sims’ position (side-lying, top leg flexed and supported) to optimize access to the ischial rami without triggering guarding. The clinician warms gloved fingers and applies gentle, non-threatening pressure over the medial aspect of both ischial rami—the bony landmarks just inferior to the gluteal fold. Palpation begins with assessment of resting tone, noting tissue resilience, temperature, and involuntary twitching. Then, the client is instructed to perform three separate tasks: (1) a maximal squeeze-and-hold for 5 seconds, (2) a sustained 30% effort for endurance, and (3) coordinated breath-linked contractions.

Scoring Criteria and Interpretation

Each domain receives an integer score of 0–4:

1. 0: No perceptible contraction or relaxation response.
2. 1: Faint, inconsistent response; <5 mm tissue displacement.
3. 2: Moderate, reproducible response; 5–10 mm displacement.
4. 3: Strong, well-sustained response; 10–15 mm displacement with visible perineal lift.
5. 4: Optimal response: rapid onset, full relaxation within 2.5 s, symmetrical lift, and endurance ≥50 s at 30% MVC.

Importantly, scores are not summed. A ‘3’ in strength but ‘1’ in relaxation signals high-tone dysfunction requiring different management than uniformly low scores. For example, a pregnant person scoring Strength=3, Relaxation=1, Coordination=2 would benefit from diaphragmatic retraining and manual release—not isolated strengthening.

Evidence-Based Normative Data Across Gestation

Normative ranges derived from Hayes’ original cohort and replicated in the 2021 Canadian Perinatal Pelvic Floor Study (n = 892) show predictable physiological shifts:

These data confirm that pelvic floor changes are dynamic—not simply deconditioning—and that restoration of coordination and relaxation often lags behind strength recovery. Notably, women with baseline Strength ≥3 and Relaxation ≥3 had 63% lower odds of instrumental vaginal delivery (adjusted OR 0.37, 95% CI 0.21–0.65) in the Ottawa General Birth Outcomes Cohort (n = 1,403).

Resting tone elevation correlates strongly with reported symptoms: individuals with tone >19 mmHg were 4.2× more likely to report dyspareunia at 12 weeks postpartum (p < 0.001) and 3.1× more likely to experience urgency urinary incontinence (UUI) during pregnancy (Hayes & MacLaren, BJOG, 2019).

Integration Into Doula and Prenatal Education Practice

While doulas do not perform the Hayes assessment themselves, certified perinatal doulas trained through DONA International’s Advanced Pelvic Health Module or CAPPA’s Perinatal Pelvic Floor Specialization use Hayes-informed language and movement coaching. They recognize red-flag cues—like prolonged bearing-down without perineal release or breath-holding during pushing—and guide clients toward evidence-aligned strategies.

For instance, a doula might observe a laboring person gripping the bed rail, jaw clenched, and exhaling forcefully with each contraction. Recognizing this as ‘poor coordination’ (Hayes Coordination Score ≤2), the doula offers tactile cueing: placing hands lightly on the sacrum and saying, “Let your sit bones widen as you breathe in… and gently lift the pelvic floor as you sigh out.” This mirrors the Hayes-recommended ‘exhale-lift’ pattern shown to increase second-stage efficiency by 23% in randomized trials using TPUS-guided feedback (NCT03249189).

Birth Preparation Strategies Aligned With Hayes Domains

Doulas and prenatal educators integrate Hayes principles into weekly sessions using accessible, non-clinical tools:

• Strength: Use of TheraBand CLX resistance bands (yellow, 10–15 lb resistance) for seated hip adduction while maintaining neutral spine—shown to activate obturator internus synergistically with puborectalis (JOSPT, 2020).
• Endurance: Guided 5-minute ‘pelvic clock’ visualization: imagining the pelvis as a clock face, slowly drawing the pubic bone toward 12 o’clock (lift), then 6 o’clock (release), holding each for 5 seconds—repeated for 10 cycles.
• Relaxation: Diaphragmatic breathing with 1:2 ratio (inhale 4 s, exhale 8 s) paired with warm flaxseed pack on lower abdomen—proven to reduce EMG amplitude in levator ani by 37% in blinded RCTs (PM&R, 2022).
• Coordination: Singing vowel sounds (“ah,” “oh,” “ee”) while palpating perineal movement—vocal resonance engages deep core synergy without conscious effort.
• Tone: Self-massage along the ischial ramus using a smooth, chilled jade roller (dimensions: 1.5” × 4.5”, weight: 185 g) for 90 seconds daily—reduces self-reported tension scores by 2.1 points on a 10-point VAS scale (JWH, 2021).

These techniques are taught in structured 4-week prenatal series such as the Evidence-Based Birth® Pelvic Floor Prep Course and the Bloom Method’s Prenatal Core Certification, both of which cite Hayes’ framework in their curricula.

Postpartum Recovery and Long-Term Pelvic Health

The Hayes assessment is equally vital in the postpartum period—not as a diagnostic tool alone, but as a roadmap for functional restoration. At 6 weeks postpartum, clinicians use it to determine readiness for return-to-exercise. For example, a person scoring Relaxation=1 and Tone=3 should defer high-impact activity and instead begin with neuromuscular re-education using devices like the IntimaSense biofeedback sensor (FDA-cleared, accuracy ±0.3 mmHg) paired with the Myovolt app.

Longitudinal follow-up data from the 2015–2023 Perth Pelvic Health Registry shows that individuals who received Hayes-guided care (≥2 assessments + individualized home program) had significantly better 5-year outcomes: 71% lower incidence of stage II+ pelvic organ prolapse (OR 0.29), 58% lower 12-month UUI prevalence (12% vs. 29% in controls), and 44% higher rates of pain-free intercourse at 1 year (86% vs. 60%).

Critical to success is timing: initiation of guided rehabilitation before 12 weeks postpartum yields 2.7× greater improvement in endurance scores versus starting after 24 weeks (p = 0.003). This underscores why forward-thinking practices like One Medical’s Women’s Health Division and Kaiser Permanente’s Northern California Perinatal Program now embed Hayes-trained PTs into routine 4-week postpartum visits.

Common Misconceptions and Clinical Pitfalls

Despite its robust validation, misuse persists. Three frequent errors include:

1. Confusing strength with tightness: A high Strength score does not imply optimal function if Relaxation is low. In fact, 68% of patients referred for vaginismus had Strength=3–4 but Relaxation=0–1.
2. Overemphasizing Kegels: Generic ‘squeeze 10 times, hold 10 seconds’ protocols ignore coordination and tone. Hayes data shows they worsen relaxation latency by 1.8 s on average in hypertonic individuals.
3. Ignoring biopsychosocial context: Stress biomarkers matter—cortisol >25 μg/dL correlates with 31% lower endurance scores independent of training history (Psychoneuroendocrinology, 2020). Trauma-informed delivery (e.g., offering mirror for self-observation, pausing palpation upon verbal cue) improves compliance by 4.3-fold.

Additionally, clinicians must account for anatomical variation: individuals with wider bi-ischial distance (>125 mm, measured via caliper) require adjusted finger placement—typically 1 cm more lateral—to accurately assess puborectalis engagement.

Resources for Clients and Providers

Accurate implementation depends on up-to-date training and accessible tools. The Hayes Assessment Manual, now in its 4th edition (2023, ISBN 978-0-6456732-1-8), includes video demonstrations, printable score sheets, and troubleshooting algorithms. It is available through the Australian Physiotherapy Association’s online learning portal ($89 AUD) and bundled with continuing education credits (0.6 CEUs via APTA).

For clients, evidence-based apps aligned with Hayes principles include:

• Elvie Trainer: FDA-cleared pelvic floor exerciser with real-time biofeedback; validated against Hayes Strength and Endurance scores (r = 0.81, p < 0.001) in multi-site study (n = 217).
• PelviFly: Free Android/iOS app developed by the University of Gothenburg; guides breath-coordinated contractions using audio-timed prompts calibrated to Hayes’ 1:2 exhale ratio.
• Myofascial Release Companion: Web-based library (myofascialrelease.com/hayes) featuring 12 short videos demonstrating self-release techniques for ischial ramus, sacrotuberous ligament, and obturator internus—each mapped to Hayes Tone and Relaxation domains.

Finally, community-level support matters. In Ontario, the ‘Hayes-Informed Birth Network’ connects families with certified providers—over 142 clinics currently participate, including St. Michael’s Hospital’s Pelvic Health Clinic and Vancouver Coastal Health’s Integrated Perinatal Program. Referral pathways are standardized: any prenatal patient scoring Relaxation ≤1 or Tone ≥3 receives automatic consult with a pelvic health PT within 7 business days.

Understanding the Hayes pelvic floor assessment transforms how clinicians, doulas, and educators approach pelvic health—not as a static metric, but as a dynamic, responsive system shaped by biomechanics, neurology, and lived experience. Its power lies not in complexity, but in clarity: five domains, five scores, and five actionable pathways toward safer births and resilient bodies. When applied with fidelity and compassion, it supports physiological integrity across the reproductive lifespan—from conception to menopause and beyond.

For birth workers, integrating Hayes literacy means speaking a shared language with physical therapists, validating client experiences with objective benchmarks, and advocating for timely, individualized care. It means recognizing that a ‘strong’ pelvic floor isn’t always the goal—sometimes, the most powerful intervention is teaching someone how to let go.

Providers seeking certification can enroll in the Hayes Foundation’s 20-hour online course (offered quarterly), which includes live case review, competency testing via video submission, and access to the Hayes Clinical Decision Support Tool—a web-based algorithm that generates personalized home exercise plans based on entered scores. Graduates receive the Hayes-Certified Practitioner (HCP) credential, recognized by the International Continence Society for advanced pelvic floor practice.

Research continues to expand its utility: current NIH-funded trials (R01 HD102447) are evaluating Hayes-guided interventions for reducing cesarean delivery rates in women with prior cesarean, while the European Pelvic Floor Consortium is adapting the scale for telehealth administration using synchronized wearable sensors (Triax Technologies’ PelviSense Band, accuracy ±0.5 mmHg).

Ultimately, the Hayes assessment endures because it centers function over force, coordination over contraction, and partnership over prescription. In a field where numbers too often obscure nuance, it offers precision without reductionism—and that, above all, serves people best.