Table 1.

Progesterone elevation during the follicular phase in the GnRH analogue ART cycles:^a

Current terminology:

1. Premature luteinization

2. Elevated progesterone on the day of hCG administration [1, 2, 25]

3. Pre-hCG progesterone elevation [20]

4. Raised follicular phase progesterone concentration [3]

Suggested new terminology:

1. Elevated luteinized origin progesterone (ELOP)

2. Elevated non-luteinized origin progesterone (ENLOP)

^aThe numbers in the brackets are the numbers of references.