Methodology & independence
Careful analysis.
Transparent reasoning.
Life expectancy is an estimate, not a certainty. A useful expert report makes its reasoning visible, considers the individual evidence and is candid about what that evidence cannot establish.
- 01
Define the question.
The starting point is the purpose of the life expectancy report: what needs to be established, for whom and within which proceedings or planning context. Relevant dates, court directions and the available records help define the scope.
- 02
Review the records.
Medical records, care documentation and functional information are reviewed for the evidence they provide about the individual. Differences between sources, gaps in the record and the dates of observations are considered as part of that review.
- 03
Establish the baseline.
Relevant population life expectancy data provide a starting point. Published literature is then considered for its relevance to the person and the question, with attention to the population studied and the limitations of applying group findings to an individual.
- 04
Consider the whole picture.
The analysis considers whether the individual evidence supports a departure from the population baseline. Co-existing conditions, frailty, mobility, nutrition, swallowing, infection history, cognition and care dependency may be relevant. Evidence of stability and protective factors also matters.
- 05
Explain the opinion.
The conclusion is accompanied by its reasoning, assumptions and limitations. Where the evidence supports a range, the report explains the basis of that range. Uncertainty and material gaps are made explicit rather than hidden behind an appearance of precision.
Professional independence
The evidence
leads the opinion.
An expert opinion must remain independent of the result the instructing party hopes to achieve.
Where CPR Part 35 applies, the expert’s duty to assist the court within their expertise takes priority over obligations to the person instructing or paying them. The report must also meet the applicable requirements of Practice Direction 35.
The procedural requirements for other courts and tribunals should be identified in the letter of instruction. Scope, competence and any potential conflict of interest need to be considered before an instruction is accepted.
Read CPR Part 35 on Justice.gov.uk ↗Read Practice Direction 35 ↗
Understanding the opinion
Clarity includes
the limitations.
The strength of a conclusion depends on the quality, relevance and completeness of the evidence available.
Is a report a medical diagnosis?
The service provides life expectancy opinion within the agreed scope. It does not replace diagnosis or treatment by the person’s treating clinicians. Medical findings are considered as evidence alongside other relevant material.
Does the report always give one precise figure?
The way the opinion is expressed depends on the evidence and the question. Where a range is supported, the reasoning for it can be explained. A life expectancy estimate should not be understood as a guarantee of how long an individual will live.
What if the evidence changes?
A report reflects the material available and the relevant date of the opinion. Significant new information may affect its conclusions. Any request for an update or clarification should identify the new evidence and the questions it raises.
Population data and individual evidence
The Office for National Statistics explains two different measures: period life expectancy uses mortality rates for a particular period, while cohort life expectancy incorporates assumptions about how those rates may change. Both describe populations; neither predicts an individual’s date of death.
An individual opinion must explain why the chosen research is relevant to the person, what assumptions are made, and how uncertainty and the available medical and care evidence affect the conclusion.
Profile & sources
About this information
Professional profile of Kerry Slater. Website updated .
For a current CV or a correction to this profile, contact Nellie Supports. Please include the relevant page when suggesting a correction.
Professional references
- ONS — period and cohort life expectancy explained
- CPR Part 35 — experts and assessors
- Practice Direction 35 — expert evidence
Further reading on professional background, research and practice.
The next step
Let’s start with
the question that matters.
Tell the Nellie Supports team what you need to establish. Suitability, scope, fees and timing can then be discussed for your instruction.