Birth Weight Category Lookup
Conventional WHO-style measured-birthweight definitions, strictly below1000/1500/2500gand hierarchically most specific. Not gestational-age percentile, small-for-age diagnosis, viability or claim≥2500gis universally healthy.
Description
Conventional birth-weight categories use mass thresholds without determining gestational maturity.
Conventional birth-weight categories use mass thresholds without determining gestational maturity.1
A category is an arithmetic classification of the supplied birth mass.
When to use Birth Weight Category Lookup
Use this tool to calculate or review the supplied observations under the stated rules. Establish the observation date, units, measurement context and independently applicable clinical reference or calibrated model.
How to use Birth Weight Category Lookup and understand its results
- Establish the observation date, units, measurement context and independently applicable clinical reference or calibrated model.
- Enter independentlyMeasuredBirthWeightGrams, using the field meanings and rules below, then run the tool.
- Read result.conventionalBirthWeightCategory. Use the units and sign conventions below.
- 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 |
|---|---|---|---|
| independentlyMeasuredBirthWeightGrams | Independently measured birth weight grams | number | Required |
Require positive birth mass in grams. Select exactly one category: below 1000, 1000 to below 1500, 1500 to below 2500, or at least 2500. Boundary values enter the next higher mass category. No high-birth-weight category or gestational-age adjustment is supplied.
category=grams<1000 ? extremelyLow : grams<1500 ? veryLow : grams<2500 ? low : atOrAbove2500 Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result; its nested fields below contain the actual calculation or selected reference | object |
| result.conventionalBirthWeightCategory | Conventional Birth Weight Category | string |
{
"input": {
"independentlyMeasuredBirthWeightGrams": 2400
},
"output": {
"result": {
"conventionalBirthWeightCategory": "low-under2500g"
}
}
}Limitations and assumptions
Dating evidence, acquisition conditions and applicable clinical references remain independently established. The output describes supplied observations or a conditional model without diagnosing an outcome, choosing a dose or verifying clinical applicability.
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 Placental Weight Ratio Calculator: Placental weight ratio relates measured placental mass to measured birth mass. For a complementary comparison, use Low Birth Weight Checker: Low birth weight is conventionally defined as birth weight below 2500 grams.
References
-
Birth Weight Category Lookup — tool.io
Similar or alternative tools
- Placental Weight Ratio Calculator
Placental weight ratio relates measured placental mass to measured birth mass.
- Low Birth Weight Checker
Low birth weight is conventionally defined as birth weight below 2500 grams.