5hmCG	5-hydroxymethylated CG dinucleotide
β-hCG	beta-human chorionic gonadotropin
BMI	body mass index
cffDNA	cell-free fetal DNA
CPM	confined placental mosaicism
CVS	chorionic villus sampling
FF	fetal fraction
FN	false negative
FP	false positive
FQA	fetal quantity assay
GC%	the proportion of G and C bases to all bases
IG	immunoglobulin
IVF	in vitro fertilization
MA	maternal age
MAF	minor allele frequency
MALDI-TOF MS	matrix-assisted laser desorption/ionization time-of-flight mass spectrometry
MW	maternal weight
NATUS	Next-Generation Aneuploidy Test Using SNPs
NGS	next-generation sequencing
NIPT	non-invasive prenatal testing
NPC	non-pregnant control
PAPP-A	pregnancy-associated plasma protein-A
PAR	pseudo-autosomal region
PGT	preimplantation genetic testing
RT-PCR	real-time poly chain reaction
SCA	sex chromosome aneuploidy
SNP	single-nucleotide polymorphism
STR	short tandem repeat
T13/18/21	trisomy 13/18/21
TN	trye negative
TP	true positive
WG	whole genome
uCG	unmodified CG dinucleotide
VAFm	maternal variant allele fraction
VAFp	paternal variant allele fraction