Description
Convert blood-film pixel area to physical area using the square of a supplied linear scale.
Laboratory records connect specimen or analyzer identifiers, measurement scales, codes and source versions. A code label and an image-area calibration describe different parts of that record. Neither replaces examination of a blood film, calibrated laboratory methods or clinical interpretation of a result.
Convert blood-film pixel area to physical area using the square of a supplied linear scale.
When to use this tool
Use Blood Film Field Area Calibration when checking the stated laboratory metadata or image-scale convention.
How to use the tool and how it works
- Enter fieldPixelArea, referencePixelLength, referencePhysicalLength. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read physicalFieldArea. Use the output convention below.
Require nonnegative fieldPixelArea/referencePhysicalLength and positive referencePixelLength. Return fieldPixelArea*(physicalReference/pixelReference)² as calibrated area.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| fieldPixelArea | Field Pixel Area | Required. Finite number; minimum 0. |
| referencePixelLength | Reference Pixel Length | Required. Finite number; strictly above 0. |
| referencePhysicalLength | Nonnegative length corresponding to the reference pixel span; zero is accepted. | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| physicalFieldArea | Field area in squared physical-reference length units, assuming isotropic pixel scaling. | Required. Finite number. |
{
"input": {
"fieldPixelArea": 10000,
"referencePixelLength": 100,
"referencePhysicalLength": 0.2
},
"output": {
"physicalFieldArea": 0.04
}
}Limitations and assumptions
- Assumes a common isotropic linear image scale; no microscope/image calibration, representative sampling or clinical interpretation is performed.
- 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
Use verified laboratory records and calibrated measurements, with qualified laboratory/medical interpretation for actual results and care decisions.
References
Similar or alternative tools
- Blood Film Morphology Source Label
Record a blood-film morphology code together with its film identifier and stated source.
- Smear Field Scale Area Tool
Calculate smear field scale area from explicit caller-supplied inputs.