have fasted
Present perfectconjugation offast.There are other translations for this conjugation.

fast

It is important that you have fasted the day you come for your blood tests.
Es importante que el día que se le va a realizar el análisis de sangre acuda en ayunas.
This means that you must have your blood drawn only after you have fasted (not eaten anything) for at least 9-12 hours.
Esto significa que hay que extraerle sangre solo después de que haya ayunado (no comido nada) durante por lo menos 9-12 horas.
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