Is your patient information actually readable?

The American Medical Association recommends a 6th-grade reading level for patient information. Studies consistently find typical consent forms scoring at grade 12 or higher. The gap is not a writing problem — it is a comprehension liability that affects every clinical pathway built around informed consent. Score your material below.

Last updated 19 September 2026

The 6th-grade reading level standard

Four sources shape the reading-level targets used for patient-facing material in the United States:

• American Medical Association (AMA Foundation) — A 6th-grade reading level for patient materials is the target most often attributed to the AMA in medical journals (Rooney et al., 2021).
• National Institutes of Health — An 8th-grade level is the target attributed to the NIH in the same review.
• Centers for Medicare & Medicaid Services (CMS) — Its rule for the Summary of Benefits and Coverage (45 CFR 147.200) names no grade. It requires a uniform format, "terminology understandable by the average plan enrollee", and print no smaller than 12-point.
• National Action Plan to Improve Health Literacy — HHS's 2010 plan has seven goals. The first is health and safety information that is accurate, accessible and actionable. It sets no grade level.

The reason the target sits at 6th grade — not 8th or 10th — is the floor, not the ceiling: the OECD's Survey of Adult Skills found that about 36 million US adults, one in six, have weak literacy skills. Writing for 6th grade reaches the largest possible portion of the patient population, including the patients who most need comprehension support.

Why patient information consistently scores above grade 10

Three structural causes:

1. Medical jargon as default vocabulary. Clinicians write the way they trained. "Anti-hypertensive medication" instead of "blood pressure pill." "Ambulate" instead of "walk." "Adverse event" instead of "side effect." Every multisyllable medical term drives the SMOG and Gunning Fog scores aggressively.
2. Legal disclaimer cadence inherited from compliance. Consent forms are drafted by risk teams whose job is exhaustive disclosure, not communication. Long subordinate clauses with multiple nested conditionals are routine. "In the event that any complication arises which, in the judgment of the attending physician, requires additional intervention beyond the scope of the previously disclosed risks..." — 33 words before the actual instruction.
3. Sentence structures from clinical training. Medical documentation favours noun-heavy passive constructions ("The patient was administered a course of antibiotics") over plain active voice ("We gave you antibiotics"). Each transformation adds syllables without adding meaning.

Which formulas matter for healthcare

Three formulas carry the most weight for patient-information scoring:

• SMOG Index — the formula health-literacy research recommends. A 2013 review of readability formulas found SMOG best suited to health care. SMOG predicts 100% comprehension (not the 50–75% threshold most other formulas use), which matters when the cost of misunderstanding is medical. Use SMOG as the primary score for any safety-critical material.
• Flesch-Kincaid Grade Level — the dashboard-friendly score. Most QA software, Word's built-in readability dialog, and most CMS plugins report Flesch-Kincaid. Useful for compliance reporting even though it under-states difficulty for jargon-heavy material.
• Gunning Fog Index — when jargon is the suspected problem. Fog penalises 3+-syllable words more aggressively than Flesch-Kincaid does, which makes it the right diagnostic for "this reads like a clinician wrote it for a clinician."

The pragmatic workflow scores against all six formulas and trusts the consensus. If SMOG runs 1.5 or more grades above Flesch-Kincaid on the same passage, vocabulary is the dominant problem, not sentence length — focus rewrites on word substitution.

High-leverage edits for patient material

1. Replace medical jargon with plain-language alternatives

Build a swap list and use it consistently. The CDC, NIH, and AHRQ all publish plain-language thesauruses for medical terminology; they're worth keeping open while editing.

• anti-hypertensive medication → blood pressure pill
• ambulate → walk
• adverse event / adverse reaction → side effect
• contraindicated → not safe / should not
• discontinue → stop
• administer → give
• laceration → cut
• oral medication → pill you swallow
• pre-existing condition → health problem you already have

Five well-chosen swaps in a 200-word section typically drop the SMOG grade by 1.5 to 2 points.

2. Split sentences at the conjunction

Any sentence over 25 words is almost always two sentences pretending to be one. Find the conjunction ("and", "where", "which", "in the event that") and split there.

Before: If you experience any chest pain, shortness of breath, or other symptoms that you believe may be related to the procedure you have just undergone, you should contact your physician immediately or proceed to the nearest emergency department for further evaluation. (43 words, FK ~14)

After: If you have chest pain or trouble breathing, call your doctor right away or go to the emergency room. These could be signs of a problem from your procedure. (29 words across two sentences, FK ~7)

Reading time roughly halves. The instruction is easier to follow under stress — which is when the patient is most likely to be reading it.

3. Define abbreviations on first use

Patient material routinely uses MRI, EKG, BP, IV, OTC, NPO, DNR, NSAID — each one a barrier to a reader who doesn't know it. The fix is mechanical: spell out the term on first use, then use the abbreviation. "Magnetic resonance imaging (MRI) scan ... your MRI ... " A single-line definition in a glossary at the end of the document is a fallback for terms used once.

What the regulators look at

What the rules and FDA guidance documents say, as read on 8 October 2026. None of the regulations names a grade level or a formula:

• CMS ACA SBC rules — Summary of Benefits and Coverage forms must be "presented in a uniform format" and "use terminology understandable by the average plan enrollee" (45 CFR 147.200). The rule names no grade level.
• FDA over-the-counter drug labeling — must be "likely to be read and understood by the ordinary individual, including individuals of low comprehension" (21 CFR 330.10).
• FDA Medication Guides — must use "nontechnical, understandable language" and type no smaller than 10 points (21 CFR 208.20).
• Informed consent — must be "in language understandable to the subject" (21 CFR 50.20). For federally funded research it must also open with a "concise and focused presentation of the key information" (45 CFR 46.116).
• HIPAA notices of privacy practices — must be "written in plain language" (45 CFR 164.520).
• FDA guidance on consumer medication information — suggests "the sixth to eighth grade reading level" (2006 guidance). Guidance is a recommendation, not a binding rule.
• FDA guidance on medical device patient labeling — says labeling predicted above the eighth-grade level should be rewritten, and that formulas "should be used to predict (not measure)" reading level (2001 guidance).
• State rules and payer contracts — can add their own requirements. Check the ones that apply to your documents.

A practical workflow for medical writers

1. Paste your draft (consent form, discharge instructions, leaflet) into the calculator. Set the audience preset to "Children K–6" — this aligns the in-target indicators with the AMA 6th-grade target.
2. Note the SMOG score specifically. If SMOG is 8 or higher, vocabulary is the lever to pull first.
3. Use the sentence-level highlight panel. Red sentences (over 25 words) are the priority rewrites.
4. Apply the three edits above: jargon substitution, sentence splits, abbreviation definitions.
5. Re-score. Repeat until SMOG ≤ 6 and the audience-target indicators are green across the board.
6. Read the final version aloud. Anywhere you stumble is where a patient will stumble.
7. If possible, validate with a non-clinical reader at the target reading level — a real reader is the only ground truth for comprehension.

Most consent forms can drop from grade 12 to grade 8 in 30 minutes with this workflow. Getting to grade 6 takes longer — but the gap from 8 to 6 is also the gap that reaches the patient population least likely to comprehend the original.

Who this matters for

• Medical writers and patient-education staff at hospitals, clinics, and health systems.
• Compliance and risk officers auditing consent forms and SBC documents for readability liability.
• Health communications agencies producing patient leaflets, drug guides, and public-health campaigns.
• Pharma medical affairs teams drafting prescribing information, patient information leaflets (PILs), and direct-to-consumer materials.
• Clinical trial coordinators drafting informed consent documents for IRB submission.
• Public-health departments producing screening guidance, vaccine information, and health-equity material.

Frequently asked questions