have fasted
Present perfect conjugation of fast. There are other translations for this conjugation.

fast

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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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