IDDSI Level 2 Mildly Thick: Who Needs It and How to Prepare It

What Is IDDSI Level 2?

IDDSI Level 2 is labelled Mildly Thick. It replaces the older clinical term "nectar thick" or "nectar consistency" that was widely used before the IDDSI framework standardised texture terminology globally in 2017. The renaming matters: "nectar" implied a specific viscosity range tied to a particular food product, while "mildly thick" describes a measurable physical property.

Physically, Level 2 flows off a spoon more slowly than water — it leaves a thin coating on the spoon — but it is still fluid enough to pour freely and does not hold any shape. Crucially, it cannot be drunk through a thin straw (the 1.6 mm bore standard straw). It is thicker than Level 1 (Slightly Thick) but noticeably thinner than Level 3 (Moderately Thick): think of the difference between fresh mango juice and a smoothie.

The official IDDSI test for Level 2 is the 10-ml syringe flow test. When 10 ml of liquid at room temperature is placed in a 10-ml syringe and the plunger is released for 10 seconds, 8 ml or more should remain in the syringe (indicating sufficient thickness), compared with less than 1 ml remaining for water.

Level 2 vs Level 0 and Level 3: The Key Differences

Level 0 (Thin): water, juice, tea, most soups. Flows instantly, can be drunk through any straw. No thickening needed for people without dysphagia, but dangerous for those with even mild swallowing dysfunction.

Level 2 (Mildly Thick): flows off a spoon but more slowly than water. Cannot be drunk through a thin straw. Provides just enough additional flow resistance to give the pharyngeal swallow reflex more time to trigger safely.

Level 3 (Moderately Thick / Liquidised): pours off a spoon in a slow continuous stream. Cannot be drunk through any straw. Cannot be eaten with a fork. Requires more preparation work and carries higher risk of inadequate fluid intake.

The gap between Level 0 and Level 2 is clinically significant. Many people prescribed Level 2 were previously drinking thin fluids without realising they were silently aspirating — meaning liquid was entering the airway without triggering a cough reflex. Silent aspiration is particularly dangerous because it goes unnoticed and can cause aspiration pneumonia, which is a leading cause of hospital admission and death among elderly people with dysphagia.

Who Needs Level 2?

Level 2 is appropriate for people with mild dysphagia where the swallow reflex is present but slightly delayed or reduced in strength. Clinical profiles that commonly lead to a Level 2 prescription include:

Early post-stroke recovery: The swallow reflex is intact but the timing is slightly off. Thin fluids arrive in the pharynx before the swallow reflex fully fires, increasing the window for aspiration. Level 2 slows the bolus just enough to close this gap.

Mild Parkinson's disease: Reduced dopamine signalling slows oral and pharyngeal phase motor control. Thin fluids require precise timing that Parkinson's patients may not consistently achieve.

Silent aspiration risk identified on clinical evaluation: Even when a person does not cough, an SLT may observe indirect signs — wet or gurgly voice quality immediately after swallowing thin fluids, throat clearing, or reduced laryngeal elevation — that indicate sub-clinical aspiration.

Post-radiotherapy for head and neck cancer: Reduced mucosal lubrication and restricted laryngeal movement from scarring can make thin fluids unsafe even years after treatment.

Early-stage motor neurone disease or multiple sclerosis: Progressive conditions that affect the cranial nerves controlling swallowing.

Clinical Triggers That Suggest Level 2 May Be Needed

Before an SLT referral, caregivers can watch for these signs after a person drinks thin fluids:

Voice sounds wet or bubbly for several minutes after drinking. This suggests fluid has collected in the laryngeal area.

Coughing or throat clearing immediately or shortly after swallowing. The cough reflex is still working — this person is catching their aspirations, but the aspiration is still happening.

EAT-10 score of 3 to 14. The EAT-10 is a validated 10-item questionnaire. Scores of 3 or above indicate swallowing risk. Scores of 15 and above suggest more significant dysfunction and likely a Level 3 or 4 prescription.

Recurrent chest infections without a clear respiratory cause. Aspiration pneumonia can present as repeated pneumonia or unexplained respiratory decline.

How to Prepare Level 2

There are two main thickener categories for achieving Level 2.

Xanthan gum-based thickeners (such as SeniorDeli Clear Thickener) are the clinical gold standard. They are transparent, temperature-stable (meaning they do not thicken further when cooled or heated), do not retrograde (become grainy over time), and do not interact with saliva in the way starch thickeners can. For a 200-ml cup of tea or juice, a typical starting dose is 0.6–0.8 g of xanthan gum powder; verify with the 10-ml syringe test or fork drip test before serving.

Starch-based thickeners (modified maize starch or potato starch) are cheaper and widely available in pharmacies and supermarkets in Hong Kong. However, they continue to thicken after preparation, especially when cooled, and can break down in the presence of amylase in saliva — meaning a Level 2 drink can become a Level 1 or even Level 0 once it is in the person's mouth. For this reason, clinical guidelines increasingly recommend xanthan gum over starch.

Common Mistakes to Avoid

Over-thickening to Level 3: This is the most common error. It happens when too much thickener is added, or when a starch-based thickener is allowed to stand for more than 15–20 minutes. A drink that has thickened to Level 3 provides more protection against aspiration but dramatically reduces palatability and increases the risk of dehydration — many people simply refuse to drink it.

Under-thickening to Level 1 or Level 0: Starch thickeners that break down in saliva can drop from Level 2 to Level 0 within minutes of contact with the mouth, especially in people with high salivary amylase activity. Xanthan gum is not susceptible to this.

Inconsistent preparation: Measuring thickener by eye rather than by weight leads to wide variability. Use a kitchen scale accurate to 0.1 g, not a measuring spoon.

Not testing the final product: Always perform a visual check (does it flow off a spoon more slowly than water?) and ideally a syringe flow test before each serving.

Next Steps

If you suspect a family member needs Level 2, start with the EAT-10 questionnaire and seek an SLT referral. Do not attempt to self-prescribe IDDSI levels — the consequences of getting it wrong, in either direction, are serious.

Once a Level 2 prescription is confirmed, SeniorDeli's [Clear Thickener](/products/clear-thickener) is designed for precise, consistent preparation. Use the Snap-to-IDDSI photo tool at [seniordeli.com/snap](/snap) to verify your prepared drinks before serving.