Phototoxicity 3T3 NRU Calculator
Actual3T3NRU phototoxicity PIFdark/light IC50 ratio from independently qualified assay; unelicited/censored IC50 cannot silently be substituted. No phototoxic classification from this ratio alone. Actual independently matched quantities/units required; not infer causal effect, clinical guidance or safe design.
Description
The 3T3 neutral-red-uptake phototoxicity comparison can use dark- and light-condition IC50 values.
The 3T3 neutral-red-uptake phototoxicity comparison can use dark- and light-condition IC50 values.1
A ratio requires independently identified, comparable endpoints and does not itself assign a hazard category.
When to use Phototoxicity 3T3 NRU Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Establish the chemical, exposure route, endpoint, measurement basis and independently applicable assay or assessment reference.
How to use Phototoxicity 3T3 NRU Calculator and understand its results
- Establish the chemical, exposure route, endpoint, measurement basis and independently applicable assay or assessment reference.
- Enter independentlyMeasuredDarkConditionIc50, independentlyMatchedLightConditionIc50, using the field meanings and rules below, then run the tool.
- Read result.observedRatio. Use the units and subtraction order below to interpret each value; retain negative differences where returned.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| independentlyMeasuredDarkConditionIc50 | Independently measured dark condition ic50 | number | Required |
| independentlyMatchedLightConditionIc50 | Independently matched light condition ic50 | number | Required |
Require a finite nonnegative numerator and strictly positive denominator. Divide the supplied measurements without converting their units or clamping the result. The implementation does not enforce numerator≤denominator, so a ratio above one can be returned. Use independently compatible definitions and units.
observedRatio=numerator/denominator Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Qualified observed calculation or explicit reference | object |
| result.observedRatio | Declared numerator divided by matched denominator on the stated compatible basis; no upper-one clamp. | number |
{
"input": {
"independentlyMeasuredDarkConditionIc50": 2,
"independentlyMatchedLightConditionIc50": 4
},
"output": {
"result": {
"observedRatio": 0.5
}
}
}Limitations and assumptions
Chemical identity, route, assay, exposure basis and reference applicability are caller-established. The output supplies no causal conclusion, universal toxicity threshold or authoritative regulatory determination.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Extremely large composite outputs are rejected.
Alternative or Complementary methods
For a related step, use In Vitro to In Vivo IC50 Calculator: Translating an in-vitro IC50 to an in-vivo context requires a validated model and exposure definition. For a complementary comparison, use QSAR Prediction Calculator: A quantitative structure–activity relationship prediction belongs to a specified model and applicability domain.
References
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Phototoxicity 3T3 NRU Calculator — tool.io
Similar or alternative tools
- In Vitro to In Vivo IC50 Calculator
Translating an in-vitro IC50 to an in-vivo context requires a validated model and exposure definition.
- QSAR Prediction Calculator
A quantitative structure–activity relationship prediction belongs to a specified model and applicability domain.