Frailty Assessment in Clinical Practice: From Screening to Diagnosis

You might picture frailty as simply “being old and weak.” But clinicians and researchers have come to understand it as something far more specific and far more actionable. Frailty is not an inevitable part of ageing. It is a clinical condition that can be identified, tracked, and in many cases, reversed. Especially when caught early.

This post draws on the International Clinical Practice Guidelines developed by the International Conference of Frailty and Sarcopenia Research (ICFSR) to explain what frailty is, why recognising it matters, and how clinicians should screen for and assess it.

Understanding the Physical Frailty Phenotype

The most widely accepted model of physical frailty was proposed by Fried and colleagues and remains the recommended standard for clinical assessment.

According to this model, frailty is identified through five physical characteristics:

1. Weakness (typically measured using grip strength)
2. Slowness (usually assessed through walking speed)
3. Unintentional weight loss
4. Exhaustion or fatigue
5. Low physical activity levels

Individuals presenting with:

• Three or more criteria are classified as frail.
• One or two criteria are classified as pre-frail.
• No criteria are considered robust.

The guideline emphasises that frailty should be viewed as a dynamic condition. People can move between robust, pre-frail, and frail states over time, highlighting the importance of regular monitoring.

Screening for Frailty: Who Should Be Screened?

The ICFSR guideline strongly recommends that all adults aged 65 years and older should be offered frailty screening using a validated screening tool appropriate for the clinical setting.

Screening should not be restricted to specialist geriatric clinics. Opportunities for screening exist across:

• Primary care
• Hospitals
• Rehabilitation services
• Community health settings
• Allied health practices

The rationale is simple: early identification allows clinicians to recognise vulnerability before disability develops.

From Frailty Screening to Frailty Assessment: What Happens in Practice?

One of the most common points of confusion is the difference between frailty screening and frailty assessment.

These are not competing approaches. Instead, they are two consecutive steps in the same clinical process.

Step 1: Screen for Frailty

The first step is to identify older adults who may be frail or at risk of becoming frail. Screening tools are designed to be quick, practical, and feasible in busy clinical settings.

Examples include:

• Clinical Frailty Scale (CFS)
• FRAIL Scale
• Edmonton Frailty Scale (EFS)

These tools help answer a simple question:

“Does this person require further assessment for frailty?”

A positive screening result does not necessarily mean the person is frail. Rather, it indicates that a more detailed evaluation is warranted.

Step 2: Perform a Clinical Frailty Assessment

If screening suggests possible frailty, a more comprehensive assessment should follow.

The ICFSR guideline recommends assessment using the Physical Frailty Phenotype described by Fried and colleagues. This assessment examines five specific characteristics:

1. Weakness (grip strength)
2. Slowness (walking speed)
3. Unintentional weight loss
4. Exhaustion
5. Low physical activity

The assessment helps clinicians determine whether the individual is:

• Robust (0 criteria)
• Pre-frail (1–2 criteria)
• Frail (3 or more criteria)

Unlike screening tools, which identify risk, the frailty phenotype provides a more detailed understanding of the person’s physical frailty status.

A Clinical Example

Imagine a 74-year-old woman attending a physiotherapy clinic because she reports difficulty walking long distances.

As part of routine screening, the physiotherapist administers the FRAIL Scale. The patient reports fatigue, difficulty climbing stairs, and recent unintentional weight loss. Her score suggests possible frailty.

At this point, the clinician does not stop with the screening result.

A detailed frailty assessment is then performed:

• Grip strength is below age-related norms.
• Walking speed is reduced.
• She reports significant fatigue.
• She has lost 6 kg unintentionally during the past year.
• Physical activity levels are low.

She meets four of the five frailty phenotype criteria and is therefore classified as frail.

In this example, the FRAIL Scale acted as the screening tool, while the frailty phenotype served as the diagnostic assessment tool.

A Practical Framework for Clinicians

For most healthcare professionals, the process can be summarised as:

Older adult (≥65 years) → Frailty screening → Positive screen → Comprehensive frailty assessment → Clinical decision-making

This approach allows clinicians to identify vulnerable older adults efficiently while ensuring that frailty classification is based on a structured and evidence-informed assessment.

Frailty, Disability, and Multimorbidity Are Not the Same

One of the most common misconceptions is that frailty is synonymous with disability.

The guideline clearly distinguishes these concepts:

• Frailty = reduced physiological reserve and increased vulnerability.
• Disability = dependence in activities of daily living.
• Multimorbidity = the presence of multiple chronic diseases.

An older adult may be frail without being disabled, and vice versa. Understanding this distinction is essential because assessment and intervention strategies differ for each condition.

Key Clinical Messages

• Frailty is a distinct clinical syndrome, not simply ageing.
• It increases vulnerability to adverse outcomes, including falls, hospitalisation, disability, and mortality.
• All adults aged 65 years and older should be considered for frailty screening.
• Practical screening tools include the Clinical Frailty Scale, FRAIL Scale, and Edmonton Frailty Scale.
• Individuals screening positive should undergo comprehensive frailty assessment.
• The Fried Physical Frailty Phenotype remains the recommended standard for clinical assessment.
• Frailty should be identified early because it is potentially reversible, particularly in its initial stages.

Recognising frailty before disability develops allows healthcare professionals to better understand an individual’s vulnerability and support healthier ageing trajectories.

Frailty reminds us that health is not simply the absence of disease. Two individuals of the same age may have vastly different reserves, resilience, and capacity to recover from life’s challenges. By identifying frailty early, we move beyond counting years and begin understanding vulnerability. In doing so, we shift our focus from treating illness alone to supporting the person behind it.

Reference

Dent E, Morley JE, Cruz-Jentoft AJ, Woodhouse L, Rodríguez-Mañas L, Fried LP, et al. Physical frailty: ICFSR international clinical practice guidelines for identification and management. J Nutr Health Aging. 2019;23(9):771-787. doi:10.1007/s12603-019-1273-z.