Description
Measure a visit's signed calendar days after a supplied birth date.
Maternity records distinguish estimated dates, recorded gestational age, postpartum calendar time and linked maternal/infant identifiers. Completed weeks plus remaining days is a representation of supplied days, not a dating estimate. Image planes, channels and birth-order labels depend on verified clinical records and source conventions.
Measure a visit's signed calendar days after a supplied birth date.
When to use this tool
Use Maternity Visit Postpartum Day when you already have birthDate, visitDate and need to measure a visit's signed calendar days after a supplied birth date.
How to use the tool and how it works
- Enter birthDate, visitDate. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read signedPostpartumDays. Use the output convention below.
Parse real UTC dates; return visitDate-birthDate in days.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| birthDate | Birth Date | Required. Text; maximum UTF-16 length 8192. Real proleptic Gregorian YYYY-MM-DD; four-digit years 0000-9999 accepted. |
| visitDate | Visit Date | Required. Text; maximum UTF-16 length 8192. Real proleptic Gregorian YYYY-MM-DD; four-digit years 0000-9999 accepted. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| signedPostpartumDays | Visit date minus birth date in calendar days; birth date itself gives zero, without gestational correction. | Required. Finite number. |
{
"input": {
"birthDate": "2026-10-01",
"visitDate": "2026-11-01"
},
"output": {
"signedPostpartumDays": 31
}
}Limitations and assumptions
- A pre-birth visit returns a negative value; no postpartum state, follow-up recommendation or clinical need is inferred.
- 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.
Alternative or Complementary methods
Consult the original dating, visit, imaging and birth records for a substantive question. Preserve each estimate's source and measurement convention; local date differences and labels do not choose a pregnancy date or assess maternal/fetal health.
References
Similar or alternative tools
- Pregnancy Dating Discrepancy Days
Compare two supplied estimated pregnancy dates.
- Obstetric Sample Gestational Day Tag
Label a specimen with supplied gestational days and dating source.