Description
Compare one nonclinical point to a supplied log-linear curve without fitting a terminal phase or recommending doses.
Pharmacokinetic research describes concentration over time using measurement units and an explicit model. Concentration-time area, its time-weighted moment, inverse-time rate constants, clearance, and volume are related but distinct quantities. A conversion or local model term does not estimate every parameter or validate a complete study.
Compare one nonclinical point to a supplied log-linear curve without fitting a terminal phase or recommending doses.
When to use this tool
Use Nonclinical Terminal Slope Point Residual when you need this concentration-time conversion, sampling check, local integral panel, or explicitly supplied kinetic-model term.
How to use the tool and how it works
- Enter time, concentration, suppliedLogIntercept, suppliedSlope. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read predictedConcentration, logResidual. Use the output convention below.
For positive concentration return predictedConcentration=exp(suppliedLogIntercept+suppliedSlope*time) and logResidual=ln(concentration)-suppliedLogIntercept-suppliedSlope*time.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| time | Time | Required. Finite number. |
| concentration | Concentration in the same assay unit as related concentration inputs. | Required. Finite number; strictly above 0. |
| suppliedLogIntercept | Supplied Log Intercept | Required. Finite number. |
| suppliedSlope | Supplied Slope | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| predictedConcentration | Predicted Concentration | Required. Finite number. |
| logResidual | Log Residual | Required. Finite number. |
{
"input": {
"time": 1,
"concentration": 0.5,
"suppliedLogIntercept": 0,
"suppliedSlope": -1
},
"output": {
"predictedConcentration": 0.36787944117144233,
"logResidual": 0.3068528194400547
}
}Limitations and assumptions
- The intercept uses the natural-log numeric concentration convention of the fitted unit, with slope inverse time. The model is supplied rather than fitted; rising slopes are allowed and the tool does not establish terminal elimination.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Signed zero is exported as zero.
Alternative or Complementary methods
Use a complete study analysis when a local panel, transformation, or model factor is insufficient. Check sampling times, censoring, assay support, unit conventions, and the validity of the assumed kinetic regime.
References
Similar or alternative tools
- PK Log Linear Terminal Slope Two Points
Two-point research log slope; no terminal-phase selection or dosing inference.
- PK Terminal Window Min Point Budget
Count distinct selected sampling times, duplicate selected rows, and the shortfall against a supplied minimum.