Description
Subtract blankColonies from integer colonies, then divide by platedVolume × dilutionFraction for unitsPerVolume.
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 blankColonies from integer colonies, then divide by platedVolume × dilutionFraction for unitsPerVolume.
When to use this tool
Use Benign Colony Count Dilution Plate Factor when you need a supplied assay recovery or volume-normalization term.
How to use the tool and how it works
- Enter colonies, platedVolume, dilutionFraction, blankColonies. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read blankCorrected, unitsPerVolume. Use the output convention below.
Subtract blankColonies from integer colonies, then divide by platedVolume × dilutionFraction for unitsPerVolume.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| colonies | Colonies | Required. Safe integer; minimum 0. |
| platedVolume | Plated Volume | Required. Finite number; strictly above 0. |
| dilutionFraction | Dilution Fraction | Required. Finite number; maximum 1; strictly above 0. |
| blankColonies | Blank Colonies | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| blankCorrected | Blank Corrected | Required. Finite number. |
| unitsPerVolume | Units Per Volume | Required. Finite number. |
{
"input": {
"colonies": 50,
"platedVolume": 0.1,
"dilutionFraction": 0.01,
"blankColonies": 2
},
"output": {
"blankCorrected": 48,
"unitsPerVolume": 48000
}
}Limitations and assumptions
- The dilution fraction is in (0, 1]; negative blank-corrected values are retained. This is benign assay arithmetic without diagnostic or viability interpretation.
- 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
- Microbial Count Recovery Supplied Factor
Subtract backgroundCount from observedCount, divide by recoveryFraction in (0, 1], and divide again by positive originalVolume for perVolume.
- Dilution Plate Volume Factor
Multiply suppliedDilutionFraction, platedVolume, and suppliedVolumeUnitFactor for effectiveSourceVolume.