The Problem With "Cleared by Their GP"
A general practitioner sees the person in front of them. They do not typically see the job. When a GP writes "fit for light duties" on a medical certificate, they are not making a binding determination under the WHS Act — they are offering a clinical opinion that the employer then has to interpret. That interpretive gap is where things go wrong.
For roles with well-defined physical demands — a concrete formwork carpenter, a hospital orderly, a process operator in a chemical plant — "light duties" is meaningless unless someone has translated it against actual task requirements. The employer, not the GP, carries the primary duty of care under s.19 of the WHS Act 2011. That duty includes providing a safe system of work, and deploying an unfit worker into a hazardous role is a breach of that system regardless of what the certificate says.
A fitness for duty assessment closes that gap. It takes the clinical opinion and maps it against a documented set of task demands to produce a specific, actionable answer.
When a Fitness for Duty Assessment Is Triggered
Not every health concern warrants a formal assessment. The trigger should be a specific, identifiable safety question. Common legitimate triggers include:
- Return to work after a significant injury, surgery, or illness (typically any absence exceeding 4–6 weeks for physically demanding roles)
- A pattern of incidents or near-misses that may indicate an underlying health issue
- A worker self-disclosing a condition that may affect their capacity for safety-critical tasks — e.g. a train driver disclosing a sleep disorder
- A role change that involves substantially different physical or cognitive demands
- Reasonable concern following observable deterioration in performance or behaviour linked to a possible health cause
- Mandatory periodic assessment under an industry standard (e.g. coal mine workers under the Coal Mine Workers Health Scheme, commercial vehicle drivers under Austroads medical standards)
The critical word in all of these is "specific". A vague sense that an employee looks tired, or a manager's discomfort with a disclosed mental health condition, does not by itself justify directing a worker to attend an independent medical examination. The direction needs a documented safety rationale tied to a specific job demand.
The Legal Framework: Three Acts, One Decision
Every fitness for duty decision in Australia sits inside a triangle of legislation. Misreading any one of them creates exposure.
Work Health and Safety Act 2011 (Cth) — and state equivalents
The primary duty under s.19 requires a person conducting a business or undertaking (PCBU) to ensure, so far as is reasonably practicable, the health and safety of workers. This means the employer must not knowingly place a worker in a role where a health condition creates a foreseeable risk of harm — to that worker or others. The obligation runs both ways: removing a capable worker from their role without evidence of incapacity may constitute a breach of the positive duty to provide meaningful, safe work.
Disability Discrimination Act 1992 (Cth)
An employer cannot exclude a worker because of disability (which includes many chronic conditions) unless the worker cannot perform the inherent requirements of the role even with reasonable adjustments. The inherent requirements defence is only available where the employer has documented those requirements in advance and has genuinely explored adjustments. A fitness for duty assessment that is not anchored to documented job demands is difficult to defend under the DDA.
Fair Work Act 2009 (Cth)
The Fair Work Act protects workers from adverse action taken for a proscribed reason — including exercising a workplace right or having a disability. If an employer directs a worker to attend a medical assessment and then uses the outcome as a pretext for dismissal where the real reason was, say, a recent workers' compensation claim, that is unlawful adverse action under Part 3-1. The process must be genuinely about safety, not about managing a difficult employee.
What a Defensible Assessment Process Looks Like
The quality of a fitness for duty assessment is almost entirely determined by the quality of the information provided to the assessor. A well-structured process has five components.
1. Documented Functional Demands Analysis
Before any assessment is commissioned, the employer must produce a Job Dictionary or Functional Demands Analysis (FDA) that describes the physical, cognitive, and psychosocial demands of the role. This includes force, frequency, posture, duration, environmental exposures, and safety-critical decisions. Without this document, the assessor is guessing.
2. Clear referral question
The referral letter should state a specific question — 'Is Mr X currently fit to perform the duties described in the attached FDA, with or without adjustments?' — not a general request for a health overview. The assessor can only answer the question asked.
3. Relevant clinical records
Provide the assessor with treating practitioner reports, specialist letters, imaging results, and any existing return-to-work plans. This avoids duplication and allows the occupational physician to focus on capacity rather than diagnosis.
4. Workplace adjustment options
Give the assessor a written list of adjustments the employer can genuinely offer — modified duties, reduced hours, alternative workstations, different shift patterns. An assessment that returns 'unfit for full duties' is significantly more actionable if the assessor can also advise on a graduated return pathway.
5. Documented decision and rationale
Whatever the employer decides to do with the assessment outcome, that decision and its rationale must be recorded. If the employer departs from the assessor's opinion, the reasons for doing so must be documented. This record is the employer's primary defence in any subsequent Fair Work or discrimination claim.
Safety-Critical Roles: Where the Bar Is Higher
For most desk-based or low-hazard roles, a fitness for duty assessment is a proportionate response to a specific concern. For safety-critical roles, it is a mandatory feature of the safety management system — and the standards are industry codified.
| Sector | Applicable Standard / Scheme | Assessment frequency |
|---|---|---|
| Commercial road transport | Austroads Assessing Fitness to Drive (2022) | Every 1–5 years depending on licence class and condition |
| Rail — non-urban | RISSB Guideline GL-09 / AS 4292 | Entry + periodic per role risk band |
| Queensland / NSW coal mining | Coal Mine Workers Health Scheme | Annual health assessment |
| Aviation (CASA) | Civil Aviation Order 48 series | Medical certificate class — annual or biennial |
| Offshore oil and gas | NOPSEMA — HSSE case requirements | Every 2 years minimum; more frequent if condition warrants |
| Defence contractors — explosive ordnance | Australian Standard + Defence contract requirements | Entry + triennial |
For these roles, "fitness for duty" is not a discretionary management tool — it is a documented control measure within the safety case. Failure to maintain current assessments is itself a reportable compliance gap.
Common Errors That Undermine Assessments
After 26 years reviewing occupational health programs across Australia and New Zealand, the same process failures appear repeatedly. None of them are complicated to fix.
- Referring to the GP's certificate rather than commissioning an independent assessment — the GP has not seen the job
- Using an outdated Job Dictionary that no longer reflects actual task demands (the role has changed; the document hasn't)
- Asking the assessor to determine 'employability' rather than 'fitness for these specific duties' — the former is an HR decision, not a medical one
- Withholding the assessment report from the worker — workers have a right to access information about their own health under Privacy Act 1988 (Cth) principles
- Using fitness for duty assessments as a performance management tool — this is adverse action risk and tends to contaminate any subsequent legitimate assessment process
- Failing to act on the outcome — an assessment that sits in a drawer does not discharge the duty of care
Frequently Asked Questions
What is a fitness for duty assessment in Australia?
A fitness for duty assessment is a medical or functional evaluation that determines whether a worker can safely perform the inherent requirements of their role. In Australia it sits at the intersection of the Work Health and Safety Act 2011 (Cth) duty of care obligations, the Disability Discrimination Act 1992 (Cth) inherent requirements defence, and individual employment contracts. The assessment is conducted by an occupational physician or occupational health nurse and produces a documented opinion about capacity — not a general health check.
Can an employer require a worker to undergo a fitness for duty assessment?
Yes, but the request must be reasonable and proportionate. The Fair Work Act 2009 (Cth) allows employers to direct employees to attend medical assessments where there is a genuine, identifiable safety concern linked to the role. Blanket or punitive requests — particularly those not tied to specific job demands — risk being characterised as adverse action. Employers should document the safety rationale in writing before issuing the direction.
What is the difference between a fitness for duty assessment and a pre-employment medical?
A pre-employment medical establishes a baseline and screens for conditions that may affect safe performance before a person starts work. A fitness for duty assessment occurs after employment has commenced — typically following injury, illness, extended absence, or an incident — and focuses on current capacity to perform a specific set of tasks. Both rely on a documented Job Dictionary or Functional Demands Analysis, but the fitness for duty assessment must also consider any workplace adjustments already in place.
How does the Disability Discrimination Act 1992 affect fitness for duty decisions?
The Disability Discrimination Act 1992 (Cth) prohibits discriminating against a person on the basis of disability unless the person cannot perform the inherent requirements of the role even with reasonable adjustments. This means an employer cannot simply exclude a worker because of a diagnosis. The assessment must evaluate functional capacity against documented job demands — and the employer must be able to demonstrate that reasonable adjustments were considered and found to be unjustifiable hardship before a decision to stand-down or terminate is made.
Who should conduct a fitness for duty assessment?
The assessor should be an occupational physician (FAFOEM or equivalent) or a registered occupational health nurse with post-graduate qualifications, operating within their scope of practice for the specific clinical question. General practitioners can contribute clinical information but should not be the sole determinants of fitness for safety-critical roles such as mine workers, rail workers, commercial drivers, or emergency responders — where industry-specific standards (e.g. RISSB, Austroads, Coal Mine Health Surveillance) apply.
What happens if a worker refuses to attend a fitness for duty assessment?
If the employer's direction to attend was lawful and reasonable, a refusal may constitute a breach of the employment contract and could be grounds for disciplinary action. However, employers should first explore whether the refusal reflects a concern about confidentiality, cost, or logistics — all of which can be resolved without escalation. The worker's right to choose their own treating practitioner is separate from their obligation to attend an employer-directed independent assessment.