Readability AnalyzerWhy patient writing needs special care
A patient who can’t understand their discharge instructions is more likely to miss a dose, miss a follow-up, or end up back in the ER. Readability here isn’t a style preference — it’s a measurable safety outcome, which is exactly why health literacy guidelines treat it differently than general writing advice.
Health literacy is a real safety issue. Patients reading discharge instructions, medication guidance, or appointment details must understand the message the first time they read it. Misunderstanding discharge instructions or medication guidance due to overly complex written materials is a documented healthcare communication problem, not just an abstract readability exercise.
That is why healthcare communication often uses SMOG as the preferred readability benchmark rather than the more commonly known Flesch-Kincaid formula.
Why SMOG is the right formula for patient materials
SMOG focuses on words with three or more syllables — in medical writing, those are often exactly the words that make a sentence hard to understand. SMOG is considered the gold-standard formula for patient-facing healthcare materials specifically because it is calibrated for full comprehension, not just general ease of reading.
SMOG tends to score 1–2 grade levels higher than Flesch-Kincaid for the same text. A document that looks fine on Flesch-Kincaid might still fail a SMOG-based health literacy check. The homepage tool uses the Patients / Healthcare audience target to encourage a SMOG score that is safe for general patient readers.
A worked example
Before: “The patient should adhere to the prescribed antibiotic regimen and report any emergent adverse events immediately to the clinical team.”
After: “Take the antibiotic exactly as prescribed, and call your care team right away if you notice any new symptoms.”
The second sentence uses clearer words and a direct structure while preserving the clinical meaning. This is the goal for patient-facing materials.
How to use the tool
Paste the text from patient education materials, discharge instructions, or consumer health copy into the homepage tool, then choose Patients / Healthcare. The analyzer will show whether your text is within the health literacy target or whether it should be simplified.
Practical tips
- Use short sentences and concrete actions.
- Avoid medical jargon unless it is defined immediately.
- Prefer everyday verbs like “take,” “call,” and “check.”
- Keep the most important instruction in the first sentence.
The underlying principle — matching language to audience capability — is shared with legal and government plain-language writing. See Plain Language Compliance for how these ideas apply in a regulatory context. For a broader explanation of how formulas work, see Formulas Explained.