Clinical Practice

The Fatigue and Bloating Visit: Structuring the Conversation Before You Order a Panel

Vague symptoms need a structured history before any test is ordered. How to run the intake conversation that decides whether a food marker panel belongs in the plan.

A patient sits down and describes three months of afternoon fatigue, bloating that comes and goes without an obvious pattern, and joints that ache more than they used to. Bloods from their primary care physician were unremarkable. They have read something online about food sensitivities and they are asking you, directly, whether food is the problem.

This is one of the more common entry points to food marker testing, and it is also the one most easily mishandled. Order the panel too early and you have a results conversation with no context to hang it on. Dismiss the question and the patient goes looking elsewhere. The useful middle path is a structured history that either earns the test or rules it out, and takes about fifteen minutes.

Start With What the Patient Has Already Noticed

Most patients arriving with this presentation have done informal experiments. They cut out bread for a fortnight, or stopped dairy in their coffee, or noticed they feel worse after restaurant meals. That history is worth more than it usually gets credit for, and it is free.

What you are listening for is timing and reproducibility. Immediate reactions — minutes to a couple of hours, often with a clear culprit — point in one direction. Reactions the patient cannot pin down, that seem to arrive the next morning or after a heavy weekend of eating, point in another. Patients rarely volunteer this structure on their own, so it helps to ask directly:

• How long after eating does the symptom appear, at its shortest and longest?
• Does the amount matter, or does any exposure do it?
• Has anything reliably reproduced the symptom more than twice?
• What did you eliminate, for how long, and what happened?

If the answers describe a fast, dose-independent, reproducible reaction, that is an immediate-hypersensitivity conversation and it may belong with an allergist. If the answers are hazy, delayed and dose-related, you are in the territory where a panel measuring markers linked to foods can add information the history cannot supply on its own.

Rule Out the Obvious Before You Reach for Serology

Food is not the only explanation for fatigue and bloating, and it should not be the first place you land. Anaemia, thyroid dysfunction, coeliac disease, medication effects, sleep debt, alcohol, and untreated stress all present in this space. Red flags — weight loss, blood in stool, nocturnal symptoms, progressive dysphagia — belong in an onward referral, not an elimination diet.

Saying this out loud to the patient does two things. It establishes that you are working a differential rather than selling a test, and it makes the eventual decision to test feel like a considered step rather than a default one. Patients notice the difference.

Explain What the Panel Measures, in Plain Terms

When the history supports testing, the framing matters. IS382 COMPLETE measures four immune markers across 382 foods: IgE for immediate-type responses, IgG and IgG4 for delayed responses, and complement C3b/d, which reflects amplification. Complement is the piece patients tend to find intuitive once you describe it — the same underlying reaction can be substantially amplified when complement is involved, which helps explain why two people with similar-looking markers do not feel similarly.

Be explicit that the panel measures markers linked to foods. It does not tell either of you what the patient's diagnosis is, and it does not decide the plan. You do that, using the markers alongside the history you have just taken. Patients accept this readily when it is stated up front; they resent discovering it at the results visit.

It is also worth normalising the question. NIH studies indicate that at least 20% of the American population have food sensitivities, which makes this a reasonable line of enquiry rather than a fringe one.

Set the Cost of the Plan, Not Just the Test

The part of this conversation clinicians most often skip is the workload that follows a result. An elimination and reintroduction protocol asks the patient to change how they shop, cook and eat out for a period of weeks, then to reintroduce foods one at a time in a deliberate sequence. Some patients have the bandwidth. Some, in a difficult month, do not.

Ask before you order. A patient who tells you honestly that the next six weeks are impossible is giving you useful scheduling information, not refusing care. For dietitians in particular, this is the moment the service structure gets set: the panel is an input, and the billable work is the interpretation and the coaching that follows.

Then Make the Logistics Small

At-home serum collection means the ordering step does not consume a room or a treatment slot. The patient leaves with a kit, collects at home, and returns for a results consultation. For chiropractors already seeing a patient for recurrent soft tissue complaints, this slots into an existing visit rhythm rather than competing with it. For union members whose plans cover testing at no cost, the affordability question is simply absent from the conversation, which changes what you are negotiating — the patient's capacity to follow the plan, not their willingness to pay for the test.

The conversation, done properly, is the clinical work. The panel is what you bring to it.