Description
Subtract backgroundCount from observedCount, divide by recoveryFraction in (0, 1], and divide again by positive originalVolume for perVolume.
Blank subtraction and recovery correction change a measured count's numerator before volume normalization. A negative corrected value can reveal measurement noise or an incompatible correction.
Subtract backgroundCount from observedCount, divide by recoveryFraction in (0, 1], and divide again by positive originalVolume for perVolume.
When to use this tool
Use Microbial Count Recovery Supplied Factor when you need a supplied assay recovery or volume-normalization term.
How to use the tool and how it works
- Enter observedCount, backgroundCount, recoveryFraction, originalVolume. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read correctedCount, recoveryAdjusted, perVolume. Use the output convention below.
Subtract backgroundCount from observedCount, divide by recoveryFraction in (0, 1], and divide again by positive originalVolume for perVolume.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| observedCount | Observed Count | Required. Finite number; minimum 0. |
| backgroundCount | Background Count | Required. Finite number; minimum 0. |
| recoveryFraction | Recovery Fraction | Required. Finite number; maximum 1; strictly above 0. |
| originalVolume | Original Volume | Required. Finite number; strictly above 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| correctedCount | Corrected Count | Required. Finite number. |
| recoveryAdjusted | Recovery Adjusted | Required. Finite number. |
| perVolume | Per Volume | Required. Finite number. |
{
"input": {
"observedCount": 100,
"backgroundCount": 10,
"recoveryFraction": 0.5,
"originalVolume": 2
},
"output": {
"correctedCount": 90,
"recoveryAdjusted": 180,
"perVolume": 90
}
}Limitations and assumptions
- Negative background-corrected values are retained; recovery is supplied rather than estimated and no viability or diagnostic claim is made.
- 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. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Review blank and recovery measurements and use a validated assay-specific analysis for scientific interpretation.
References
Similar or alternative tools
- Benign Colony Count Dilution Plate Factor
Subtract blankColonies from integer colonies, then divide by platedVolume × dilutionFraction for unitsPerVolume.
- Dilution Plate Volume Factor
Multiply suppliedDilutionFraction, platedVolume, and suppliedVolumeUnitFactor for effectiveSourceVolume.