ASD	autism spectrum disorder
BASC-2	Behavior Assessment System for Children, Second Edition
β-hCG	human chorionic gonadotropin beta
BMI	body mass index
CES-D 10	Center for Epidemiological Studies Depression Scale
D2	deiodinase type 2
D3	deiodinase type 3
EAR	estimated average requirement
hCG	human chorionic gonadotropin
HOME score	Home Observation for Measurement of the Environment score
HPT axis	hypothalamic-pituitary-thyroid axis
I−	iodide
ICP-MS	inductively coupled plasma mass spectrometry
INSPQ	Institut National de Santé Publique du Québec
IQ	intelligence quotient
IUCPQ	Institut Universitaire de Cardiologie et de Pneumologie de Québec
LOD	limit of detection
FSIQ	full-scale IQ
fT3	free T3
fT4	free T4
MSAQ	maternal self-administered questionnaire
MIREC study	Maternal–Infant Research on Environmental Chemicals study
MIREC-CD+ study	MIREC-Child Development Plus study
Na+, K+-ATPase	sodium potassium-activated adenosine 5′-triphosphatase pump
NIS	sodium/iodine symporter
PFAS	per- and polyfluoroalkyl substances
PIQ	performance IQ
rT3	reverse T3
SRS-2	Social Responsiveness Scale, Second Edition
T1	trimester 1
T2	trimester 2
T3	triiodothyronine
T4	tetra-iodothyronine thyroxine
tT4	total T4
TBG	thyroxine-binding globulin
Tg	thyroglobulin
TgAb	Tg antibodies
TH	Thyroid hormone
Thyroid-Ab-pos	positive thyroid antibodies
TPO	thyroid peroxidase
TPOAb	TPO antibodies
TSH	thyroid-stimulating hormone
UCr	urinary creatine concentration
UIC	urinary iodine concentration
UIC/Cr	urinary iodine concentration divided by urinary creatinine concentration
UIC/Cr_Avg	average UIC/Cr of the two samples collected in the first and second trimester
UL	upper intake level
VIQ	verbal IQ
WHO	World Health Organization
WPPSI-III	Wechsler Preschool and Primary Scale of Intelligence, Third Edition