Glossary entry (derived from question below)
English term or phrase:
And it is referred to upon civil registration
Spanish translation:
Sirve de antecedente/preuba para el registro civil.
English term
El Salvador
And it is referred to upon civil registration
Proposed translations
Chile
Human-scale Globalization
Native in: English (Variant: British) 
Works in: Spanish to English, French to English, English to Spanish, and 2 more.
Sirve de antecedente/preuba para el registro civil.
https://aiqiang.org/wp-content/uploads/2021/06/中国医学出生证明翻译模版类...
"it is referred to upon civil registration" means that this certificate, issued by the health authority, is used when the birth is registered by the civil authority.
Best wording in Spanish will depend on Asker's preferences.
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Note added at 3 hrs (2022-05-25 17:32:19 GMT)
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Mejor, creo: '... para la inscripción en el Registro Civil'.
o: 'en el momento de proceder a la inscripción el en Registro Civil'.
Certified Translator
Native in: Spanish (Variants: Colombian, Uruguayan, Guatemalan, Panamanian, Paraguayan, Argentine, Honduran, Chilean, Canarian, Venezuelan, Costa Rican, Dominican, Mexican, Rioplatense, Standard-Spain, Bolivian, US, Ecuadorian , Cuban, Latin American, Salvadoran, Peruvian, Nicaraguan)
Works in: English to Spanish, Spanish to English
El cual servirá para los propósitos hasta su registro civil (o en estadísticas vitales)
Los formularios estadísticos de Nacimientos Vivos, Defunciones y Defunciones Fetales constan de un original y una copia, los mismos se entregan a las Oficinas del Registro Civil: direcciones regionales, oficinas distritales y registradores auxiliares y d
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