The International Dysphagia Diet Standardisation Initiative (IDDSI) framework has become the global standard for describing food textures and drink thicknesses for individuals with dysphagia. If you are working in any medical setting, understanding IDDSI is no longer optional — it is essential.
The IDDSI framework consists of 8 levels (0–7), with drinks at levels 0–4 and foods at levels 3–7. The framework uses a continuum rather than discrete categories, recognizing that texture modification exists on a spectrum. This continuum model replaced the older National Dysphagia Diet (NDD) system and is now used in hospitals, skilled nursing facilities, and home health settings worldwide.
IDDSI Drink Levels
Level 0 — Thin: Regular water and most drinks. Flows like water. Level 1 — Slightly Thick: Slightly thicker than water; flows through a standard straw with minimal effort. Level 2 — Mildly Thick: Flows off a spoon; requires some effort to drink through a straw. Level 3 — Moderately Thick: Can be drunk from a cup but flows slowly; cannot be drunk through a standard straw. Level 4 — Extremely Thick: Cannot be drunk from a cup; holds its shape on a spoon.
IDDSI Food Levels
Level 3 — Liquidised: Smooth, pourable, no lumps; requires no chewing. Level 4 — Pureed: Smooth, cohesive, no lumps; holds its shape on a spoon but cannot be bitten off. Level 5 — Minced and Moist: Small, moist pieces no larger than 4mm; requires minimal chewing. Level 6 — Soft and Bite-Sized: Soft, tender pieces no larger than 15mm; requires some chewing. Level 7 — Regular: Normal, everyday foods of any texture.
IDDSI Testing Methods
IDDSI provides standardized testing methods for each level. The Fork Drip Test and Spoon Tilt Test are used for drinks. The Fork Pressure Test assesses food texture. The Chopstick Test is used for Level 3 foods. These simple bedside tests allow clinicians and food service staff to verify that foods and drinks meet the prescribed level before serving.
Clinical Tip: Always document the specific IDDSI level prescribed, the rationale based on your clinical evaluation findings, and evidence that the patient and caregiver understand the recommendations. Patient and caregiver education is a critical — and billable — component of dysphagia management.
Clinical Application
When prescribing IDDSI levels, be specific. "Pureed diet" is not sufficient — document "IDDSI Level 4 Pureed diet with IDDSI Level 2 Mildly Thick liquids." This precision protects your patient, supports your clinical reasoning, and reduces the risk of adverse events related to texture non-compliance.
Regularly reassess your patients' IDDSI levels. Dysphagia is often dynamic — patients may progress to less restrictive textures as they recover, or may require more restrictive levels if their condition changes. Document every reassessment and the clinical rationale for any changes.