NaProTECHNOLOGY

The P+3 progesterone lab test  was developed by Dr. Thomas Hilgers after 30+ years of research. He published a study in 2020 which indicated that a progesterone level drawn on P+3 was a good marker to determine that an "ovulatory event" has passed. Please note, the only way to determine if a "healthy ovulation" has occurred is via a Follicular US series. 

The P+3 test can be used if a woman is lacking confidence using the CREIGHTON MODEL FertilityCare™ System (CrMS), such as in the case where she may have a "continuous mucus pattern", which can make identifying a true Peak day more challenging. 

Table 1 below represents the P+3 progesterone interpretation used by many NaPro providers. 

- 0.0–1.0 ng/mL: You have either not yet had an ovulatory event or you are within twenty-four hours of starting your period.
 

- 1.1–2.3 ng/mL: You are in the midst of an ovulatory event. Repeating another level in forty-eight hours should clarify your situation. You should consider yourself fertile.
 

- 2.4–3.0 ng/mL: You have almost for certainly had an ovulatory event. To be absolutely sure, a repeat level in twenty-four to forty-eight hours will clarify it. You are most likely not fertile until your next period starts.
 

- 3.1 ng/mL or >: You have had an ovulatory event, and you are naturally infertile until the start of your next menstrual period.
 

PLEASE NOTE: This test is not for medical, diagnostic or therapeutic purposes. It is for assisting you in identifying a natural ovulatory event and it is intended for use in association with the CREIGHTON MODEL FertilityCare™System.

Reference:

Hilgers TW. The Identification of Postovulation Infertility with the Measurement of Early Luteal Phase (Peak Day +3) Progesterone Production. Linacre Q. 2020 Feb;87(1):78-84. doi: 10.1177/0024363919885551. Epub 2019 Nov 13. PMID: 32431450; PMCID: PMC7016439. Full article here: