Table 1.

Mean Retinoid Levels in Plasma and Follicular Fluid From Women Undergoing In Vitro Fertilization.

	Plasmaa mean (SEM) pmol/mL	Follicular fluidb mean (SEM) pmol/mL	Ratio of plasma to follicular fluid
Retinol	2112 (62)	1306 (56)	1.6
All-trans retinoic acid	8.6 (0.5)	5.2 (0.3)	1.7
9-cis retinoic acid	Not detected	Not detected	N/A
9,13-cis retinoic acid	0.7 (0.1)	0.4 (0.03)	1.6
13-cis retinoic acid	2.2 (0.1)	0.9 (0.1)	2.3
Total retinoic acid	11.3 (0.6)	6.5 (0.4)	1.7
Retinyl esters	550 (22)	130 (8)	4.2

Abbreviations: N/A, not available; SEM, standard error of the mean.

^a N = 79.

^b N = 132.