Using the Functional Medicine Matrix to Prioritise a Case
Level 3, Clinical application
In brief
Once the matrix is filled in, the practitioner must decide where to start. A practical prioritisation weighs each candidate mediator by urgency and safety, its influence across systems, how modifiable it is, the patient’s readiness and goals, and the strength of evidence for intervening. Plans are then sequenced in phases: safety first, then foundations, then targeted interventions, with specialist referral where needed, and reviewed as the picture changes.
A completed functional medicine matrix can be overwhelming. A complex patient may have findings in every system, a dozen lifestyle factors that could be improved and several supplements, practitioners and medicines to consider. Trying to change everything at once rarely works; patients become overwhelmed, adherence falls and it becomes impossible to tell what helped. The skill that turns a matrix into a plan is prioritisation. This article offers a structured way to do it.
5 questions for every candidate
For each finding or mediator that might be addressed, 5 questions help decide its priority.
| Question | What it considers |
|---|---|
| Is it urgent or unsafe? | Red flags, dangerous interactions, uncontrolled disease, safeguarding concerns |
| How much does it influence other systems? | Hub mediators such as sleep, blood sugar, inflammation or alcohol affect many findings at once |
| How modifiable is it? | Can it realistically change, and how quickly? |
| What does the patient want, and are they ready? | Alignment with goals and readiness for change |
| How strong is the evidence for intervening? | Established treatments rank above speculative ones |
Items that are urgent always come first. Among the rest, those with high influence, high modifiability, patient support and strong evidence rise to the top.
Sequencing in phases
Phase one: safety
Address red flags, refer for urgent assessment, resolve dangerous interactions, stop harmful products and ensure essential medical treatment is in place.
Phase 2: foundations
Sleep, meal pattern, activity, alcohol and stress are the foundations on which other interventions depend. Improving 1 or 2 foundations often produces changes across several systems and builds the patient’s confidence.
Phase 3: targeted interventions
Specific dietary therapies, correction of confirmed deficiencies, targeted supplements, structured programmes for particular conditions and further investigation where needed.
Phase 4: specialist and long term care
Referral for specialist assessment, long term monitoring and prevention.
These phases overlap in practice. A confirmed iron deficiency can be treated alongside sleep improvements, for example. The point is to avoid starting targeted protocols while foundations and safety issues remain unaddressed.
How many changes at once?
For most patients, 2 or 3 changes at a time are manageable. More than that risks overload and makes it difficult to attribute effects. Where several changes are needed urgently, grouping them into a coherent routine, such as an evening routine that combines earlier dinner, no alcohol and a fixed bedtime, helps.
A worked example
Consider an illustrative patient: a 45 year old taxi company manager with psoriasis that has worsened over 2 years, fatigue, reflux, a BMI of 34, loud snoring, low mood and joint stiffness. He drinks 4 beers most nights, sleeps 5 and a half hours, eats most meals late and takes an over the counter acid suppressant daily, turmeric capsules and a sleep aid containing an antihistamine.
The matrix in brief
| System | Findings |
|---|---|
| Assimilation | Reflux, daily acid suppressant, late meals |
| Defence and repair | Worsening psoriasis, joint stiffness |
| Energy | Fatigue |
| Biotransformation | Heavy alcohol intake |
| Transport | Blood pressure not recently checked |
| Communication | Low mood, short sleep, snoring |
| Structural integrity | Joint stiffness |
| Lifestyle | Short sleep, alcohol, late eating, inactivity, work stress |
Scoring the candidates
| Candidate | Urgent or unsafe | Influence | Modifiable | Patient priority | Evidence | Priority |
|---|---|---|---|---|---|---|
| Joint stiffness with psoriasis | Yes: possible psoriatic arthritis needing assessment | High | With treatment | Moderate | Strong for early treatment | Phase one: refer |
| Snoring, possible sleep apnoea | Yes, especially as a driver | Very high | High | High once explained | Strong | Phase one: refer for sleep study |
| Alcohol | Moderate | Very high: sleep, reflux, psoriasis, mood, weight, liver | Moderate | Moderate | Strong | Phase 2 |
| Short sleep and late eating | No | High | High | High: he wants more energy | Strong | Phase 2 |
| Weight | No | High | Gradual | Moderate | Strong: weight loss improves psoriasis | Phase 2, following foundations |
| Low mood | Screen for risk | High | Moderate | Moderate | Strong | Screen now; treat as needed |
| Sedating antihistamine sleep aid | May worsen sleep apnoea | Moderate | High | Low | Clear | Phase one: review |
| Daily acid suppressant | No | Moderate | High once reflux improves | Low | Moderate | Phase 3 |
| Turmeric | No | Low | High | He values it | Limited | Accommodate for now |
The resulting plan
Phase one: referral for assessment of possible psoriatic arthritis and for a sleep study; blood pressure check; depression screen; stop the sedating sleep aid.
Phase 2: an evening routine built around finishing dinner by 8 pm, reducing beer to 2 nights a week to begin with, and a fixed bedtime giving 7 hours. A daily walk.
Phase 3: once reflux improves with these changes, a planned reduction of the acid suppressant; a structured weight management approach; dermatology and rheumatology treatment as advised.
At 3 months, he has been diagnosed with sleep apnoea and started treatment, begun treatment for psoriatic arthritis, reduced alcohol substantially and lost 4 kg. His reflux has settled, his psoriasis is improving and his mood is better. Several findings improved because the plan targeted the mediators with the most influence.
Reviewing and re prioritising
Prioritisation is not a one off exercise. At each follow up, the matrix is updated: some findings resolve, others become clearer and new priorities emerge. A patient whose sleep and alcohol have improved may now be ready for more targeted work on diet or exercise. Revisiting priorities keeps the plan responsive.
Common mistakes
- Starting with supplements before addressing safety and foundations.
- Choosing interventions by practitioner preference rather than by influence and patient goals.
- Changing too many things at once.
- Missing a red flag because it sat quietly in one box of the matrix.
- Failing to revisit the plan as the picture changes.
From map to route
The matrix provides a map of the patient’s physiology. Prioritisation chooses the route. A structured approach, weighing urgency, influence, modifiability, patient goals and evidence, turns a complex picture into a plan that patients can follow and that produces meaningful change.
Questions about prioritisation
How do practitioners decide where to start?
How many changes should a patient make at once?
What comes first in a functional plan?
References
- Hanaway P. Form follows function: a functional medicine overview. The Permanente Journal. 2016;20(4).
- Evidence of a causal relationship between body mass index and psoriasis: a mendelian randomization study. PLoS Medicine. 2019;16(1).
- Gossec L, Kerschbaumer A, Ferreira RJO, et al. EULAR recommendations for the management of psoriatic arthritis with pharmacological therapies: 2023 update. Annals of the Rheumatic Diseases. 2024;83(6).
- Michie S, van Stralen MM, West R. The behaviour change wheel: a new method for characterising and designing behaviour change interventions. Implementation Science. 2011;6:42.
Continue your learning
Prioritising complex cases in practice
Prioritising and sequencing complex cases is practised in live case discussions throughout IIFM’s 6 month Functional Medicine and Clinical Nutrition program, where practitioners build and defend plans for real patients.
This article is for the education of healthcare professionals. It is not a substitute for individual medical advice, diagnosis or treatment, and does not change any practitioner’s scope of practice. Regulation and guidelines differ between countries.