HOW FAR SHOULD WE GO TO AVOID PIO?
The rationale and data surrounding differing routes of administration for progesterone supplementation, progesterone in oil (PIO) vs. vaginal, as luteal phase support during FET cycles is discussed in this editorial. Data suggests that when using vaginal progesterone, monitoring of progesterone levels may be necessary, while PIO may render monitoring unnecessary. A recent study has shown that patients have no clear preference to route of administration of progesterone when routes have similar efficacy.