Amniotic Fluid (also known as Amniotic Fluids, Fluid, Amniotic): A clear, yellowish liquid that envelopes the FETUS inside the sac of AMNION. In the first trimester, it is likely a transudate of maternal or fetal plasma. In the second trimester, amniotic fluid derives primarily from fetal lung and kidney. Cells or subs

NIH MeSH · D000653Anatomy

Amniotic Fluid

Also known asAmniotic Fluids · Fluid, Amniotic · Fluids, Amniotic · Amniotic Fluid Index · Amniotic Fluid Indices · Fluid Index, Amniotic · Fluid Indices, Amniotic · Index, Amniotic Fluid · Indices, Amniotic Fluid

Definition

A clear, yellowish liquid that envelopes the FETUS inside the sac of AMNION. In the first trimester, it is likely a transudate of maternal or fetal plasma. In the second trimester, amniotic fluid derives primarily from fetal lung and kidney. Cells or substances in this fluid can be removed for prenatal diagnostic tests (AMNIOCENTESIS).

MeSH classification

  • A12.098
  • A16.378.149

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Common questions about Amniotic Fluid

What does Amniotic Fluid mean in medicine?
A clear, yellowish liquid that envelopes the FETUS inside the sac of AMNION. In the first trimester, it is likely a transudate of maternal or fetal plasma. In the second trimester, amniotic fluid derives primarily from fetal lung and kidney. Cells or substances in this fluid can be removed for prenatal diagnostic tests (AMNIOCENTESIS). This definition is taken from the National Library of Medicine's MeSH (Medical Subject Headings) 2026 release, which is the standard vocabulary used to index PubMed and most medical literature.
Is Amniotic Fluid known by any other names?
Yes. Amniotic Fluid is also referred to as Amniotic Fluids, Fluid, Amniotic, Fluids, Amniotic, Amniotic Fluid Index in different clinical, research and patient-facing contexts. The MeSH descriptor groups all of these synonyms under a single canonical concept so research and records stay consistent.
Where does Amniotic Fluid sit in the medical classification?
Amniotic Fluid falls under the broader medical category "Anatomy" in the MeSH hierarchy (tree numbers: A12.098, A16.378.149). Browsing the related concepts on this page takes you to neighbouring topics in the same branch of medicine.
Where can I get a plain-language explanation of Amniotic Fluid?
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Source: NIH MeSH 2026 (D000653) — National Library of Medicine, public domain. View official MeSH record ↗