When Medicine Doesn't Fit Inside a Rule Book

Understanding Guidelines, Diagnostic Criteria, and Clinical Judgement

One afternoon, a patient looked at me with genuine confusion. "Doctor, I read the guideline online. It says I don't meet the criteria for this disease." A few moments later came another question. "And why are you prescribing a medication that isn't even approved for it?"

Both were excellent questions. Medicine is built on science, but it is practiced one patient at a time.

Guidelines Are Exactly That — Guidelines

Clinical guidelines summarize the best available evidence and help doctors provide consistent, evidence-based care. However, they describe what is usually best for most patients — not necessarily every patient. Good doctors know the guidelines. Experienced doctors also know when an individual patient's circumstances require a different approach.

Every Patient Is Different

Medicine is not mathematics. Two people with the same diagnosis may need different treatments because of age, pregnancy, other illnesses, medication intolerance, or personal circumstances. The science remains the same; its application changes.

Classification Criteria Are Not the Same as Diagnosis

Classification criteria are designed primarily for research, where investigators need to be certain that participants truly have the disease being studied. Diagnosis has a different purpose: recognising disease in the individual patient. Using classification criteria as diagnostic criteria in everyday practice can lead to both underdiagnosis and overdiagnosis. Diagnosis always requires clinical judgement.

Why Are Some Medicines Used 'Off Label'?

Off-label prescribing is common in many areas of medicine. It does not mean a treatment lacks evidence. Often, high-quality studies and expert recommendations support these uses, but manufacturers have not pursued regulatory approval for every indication because doing so is costly and time-consuming.

A Map Is Not the Journey

Imagine driving across the UAE. A map is invaluable, but if the road ahead is blocked, blindly following it may not be the safest choice. An experienced driver uses the map while responding to real conditions. Medicine works the same way: guidelines provide the map, evidence points the way, and clinical judgement helps navigate unexpected situations.

Science Provides the Map. Doctors Navigate the Journey.

Evidence-based medicine combines the best available scientific evidence, the doctor's clinical judgement, and the patient's own circumstances, values, and preferences. The best doctors do not ignore evidence, nor do they apply it mechanically — they use it wisely.

A Final Thought

Medicine would be much simpler if every patient fit neatly into a textbook. They do not. Guidelines, classification criteria, and scientific evidence remain essential, but none can fully replace the careful assessment of the individual sitting in front of the doctor. Ultimately, medicine is not about treating a guideline. It is about treating a person.