Progesterone

nmol/L · Reproductive & adrenal hormones

Progesterone is a key pregnancy hormone supporting uterine quiescence and placental function — values rise sharply by trimester.

Reference intervals are gestation-specific; a single draw is rarely actionable without dating and clinical context. Not modelled in food logs except for educational supplement entries.

How to read it

Trends and ultrasound dating matter more than isolated values. Low early values may prompt viability assessment per local protocol.

Trimester context

Stage	For the mother	For the baby
First trimester	Corpus luteum then placental production sustains early pregnancy.	Supports uterine environment during implantation and organogenesis.
Second trimester	Levels rise with placental mass.	Continued support for uterine relaxation and growth.
Third trimester	Peak levels reflect mature placental function.	Prepares for labour transition — interpretation is obstetric.