IOC sensory panel: how olive oil is graded

In brief. The IOC sensory panel is the official taste analysis that classifies virgin olive oil. An approved jury of trained tasters scores two medians: the median of defects (Md) and the median of fruitiness (Mf). For an extra virgin, you need Md = 0 (no defect) and Mf > 0 (perceptible fruitiness). Virgin tolerates Md ≤ 3.5; beyond that, the oil becomes lampante (Md > 3.5), not marketable as such in the EU. It is the only grading criterion that cannot be measured by chemistry.

Chemical analysis (acidity, peroxide, UV indices) is not enough to classify a virgin olive oil. Official grading also requires a sensory evaluation by an approved jury: the panel test. It is the panel that decides between extra virgin, virgin and lampante. Here is how it works and how to read its result on a COA.

What is the IOC sensory panel?

The sensory panel — or panel test — is the organoleptic analysis method defined by the International Olive Council (standard IOC/T.20). A jury of 8 to 12 approved tasters, selected and trained, tastes the oil under standardised conditions (opaque blue glass, oil at 28 °C) so as not to be influenced by colour.

Each taster evaluates the intensity of the positive attributes (fruity, bitter, pungent) and of the defects (musty, muddy sediment, rancid, fusty, winey, metallic…). The results are compiled statistically into medians, which determine the oil's official category.

Md and Mf: the two figures that classify the oil

Two medians drive the sensory grading:

• Md — median of defects. This is the median of the defect perceived with the greatest intensity. Md = 0 means that no defect is detected by the jury.
• Mf — median of fruitiness. This is the median of the "fruity" attribute, which expresses the aromas of the sound olive. Mf > 0 means fruitiness is perceptible.

An extra virgin must be flawless (Md = 0) and aromatic (Mf > 0). A single defect perceived by the jury, however faint, tips the oil into the lower category — regardless of how clean its chemical analysis is.

Sensory panel thresholds by category (IOC/EU)

Here are the sensory thresholds set by the IOC trade standard and adopted by European Union regulation. Reference data, to be verified against the texts in force.

Category	Median of defects (Md)	Median of fruitiness (Mf)	Commercial status
Extra virgin (EVOO)	Md = 0	Mf > 0	Premium, direct sale
Virgin	Md ≤ 3.5	Mf > 0	Direct sale
Ordinary virgin (IOC only)	Md ≤ 6.0	—	IOC yes, EU no
Lampante	Md > 3.5 (EU)	may = 0	Not marketable → refining

Key point for EU export: the European Union does not recognise the "ordinary" category. As soon as the median of defects exceeds 3.5, a virgin oil is classified lampante and must be refined before any placing on the market. It is the EU category that governs an import into Europe.

The panel prevails over clean chemistry

This is the point buyers most often misunderstand. An oil can show perfect chemistry — acidity ≤ 0.4%, peroxide ≤ 10, compliant UV indices — and still be downgraded by the panel if the jury detects a defect (Md > 0).

The typical case: an oil stored too long in a poorly maintained tank develops a "muddy sediment" or "rancid" defect imperceptible in chemistry but clear on tasting. Result: it loses its extra virgin status. Conversely, no chemical analysis can "make up for" a proven sensory defect.

Official grading therefore combines chemistry + panel:

1. Free acidity (≤ 0.8% for EVOO).
2. Peroxide value (≤ 20 mEq O₂/kg).
3. UV absorbances: K232, K270, ΔK.
4. Sensory panel: Md = 0 and Mf > 0 for EVOO.

To cross-check all of these thresholds, try our COA quality classifier.

How to use the panel when buying in bulk

• Require the panel on the COA. A certificate without a sensory result is incomplete: it does not prove the EVOO category. (See our quality process.)
• Check the laboratory. The panel must come from an IOC-approved jury; in Tunisia, per-lot analysis is carried out under ONH supervision.
• Ask for the breakdown of defects. An Md > 0 must be explained (nature of the defect): it is negotiation and shelf-life information.
• Add a reference sample. In case of dispute, it allows the delivered oil to be compared against the original tasting.

Tunisian oils of the Chetoui variety (North, ardent and bitter) and Chemlali (South, sweet and fruity), cold-extracted quickly after harvest, regularly achieve Md = 0 profiles and a clear fruitiness — which explains the many Tunisian distinctions in international competitions.

FAQ — IOC olive oil sensory panel

What is the IOC sensory panel?

It is the official taste analysis defined by the International Olive Council. A jury of 8 to 12 approved tasters tastes the oil under standardised conditions and evaluates its positive attributes and defects. The result, expressed as medians (Md and Mf), classifies the oil as extra virgin, virgin or lampante.

What do Md and Mf mean?

Md is the median of defects: Md = 0 means no defect detected. Mf is the median of fruitiness: Mf > 0 means perceptible fruitiness. An extra virgin requires Md = 0 and Mf > 0. These two figures appear on a complete COA.

What sensory thresholds for an extra virgin?

For an extra virgin, you need Md = 0 (no defect) and Mf > 0 (perceptible fruitiness). For a virgin, Md can go up to 3.5. Beyond 3.5 (EU), the oil is lampante and must be refined. IOC/EU thresholds, to be verified.

Can the panel downgrade an oil with perfect chemistry?

Yes. The panel prevails: an oil with flawless acidity and peroxide will be downgraded if the jury detects a defect (Md > 0). No chemical analysis compensates for a proven sensory defect. That is why the panel is indispensable to official grading.

Who performs the sensory panel for export?

An IOC-approved jury. In Tunisia, per-lot sensory analysis is carried out under ONH supervision in an approved laboratory. An "in-house" tasting or a seller's declaration has no evidential value for export.

Can an oil be classified without a sensory panel?

No, not officially for virgin oils. Chemistry (acidity, peroxide, UV) is necessary but insufficient: without a compliant panel, a chemically clean oil cannot be classified as extra virgin. The COA must always include the sensory result.

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Do you require a sensory panel before buying? Request a quote: each lot is delivered with its complete COA including the panel (Md/Mf) from an IOC-approved jury and a reference sample. For all the technical vocabulary, see the glossary.