A–Z Glossary

No-call result

A no-call result means a laboratory could not produce an interpretable prenatal screening result, often because fetal fraction was too low.

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NIPT accuracy timing and limitations

NIPT accuracy timing and limitations

What NIPT is actually testing NIPT analyzes cell-free DNA fragments in the pregnant person’s bloodstream. A portion of these fragments comes from the placenta and is often used as a proxy for fetal chromosomal status. This is why many clinicians prefer the term cell-free DNA screening: the sample is maternal blood, and the fetal component […]