What it is
Oligohydramnios means AFI <5 cm or deepest vertical pocket <2 cm. In the second trimester it can signal fetal kidney or urinary tract problems or PPROM. Near term, isolated oligohydramnios in an otherwise healthy pregnancy is often managed with increased hydration, closer monitoring, and consideration of induction.
Evidence review links
Each link opens the full review on the publisher's site in a new tab.
Possible benefits
- Straightforward to detect with ultrasoundReview sources ↓
- Hydration and rest sometimes improve fluid levels near termReview sources ↓
Possible risks
- Cord compression during labor (variable decelerations)Review sources ↓
- Fetal growth restriction, meconium-stained fluid, and induction of labor are more commonReview sources ↓
Alternatives
- Serial ultrasound and NSTsReview sources ↓
- Increased oral or IV hydrationReview sources ↓
- Induction of labor at term, especially with additional risk factorsReview sources ↓
- Amnioinfusion in labor for repetitive variable decelerationsReview sources ↓
Current evidence
ACOG guidance supports individualized management; a Cochrane review of amnioinfusion for variable decelerations found reduced cesarean delivery for suspected cord compression.
Where the evidence is clear · where people may choose differently
For most topics, guidelines from ACOG, WHO, and other major bodies broadly agree on the core safety points (when to act in an emergency, informed-consent standards, monitoring baselines). Where reasonable people — and even guidelines — differ tends to be around thresholds (when to start or stop something), preferences (comfort, environment, support), and values (how you weigh small risks against benefits). Use the questions below to explore those pieces with your care team.
Educational only. Your care team can help you weigh what applies to your specific situation.
Related evidence topics
- Prenatal Ultrasounds — What Each One Is ForDating scan, NT scan, anatomy scan, growth scans, biophysical profiles, and non-medical 'keepsake' ultrasounds — what they tell you, and what they don't.
- Induction of LaborMedical methods used to start labor before it begins on its own — see the method-specific topics below for details.
- Fetal Growth Restriction (FGR / IUGR)Baby measures smaller than expected for gestational age — often defined as estimated fetal weight <10th percentile with additional criteria for severity.
- Fetal MonitoringContinuous vs intermittent monitoring of the baby's heart rate during labor.
Questions to ask your care team
- ?Is this isolated or paired with growth or Doppler changes?
- ?Would we induce, and at what gestational age?
- ?What extra monitoring in labor if fluid stays low?
- ?Any indication for amnioinfusion?
Universal questions (works for any decision)
A short BRAIN-style set you can bring to any conversation about interventions, monitoring, or care decisions.
- ?Why are you recommending this now — is it urgent, routine, or optional?
- ?What happens if we wait an hour (or longer) before deciding?
- ?What signs would tell us this is working — or that we need to change course?
- ?What are the alternatives, including doing nothing?
- ?What would you recommend if this were your family?
- ?What would change your recommendation?
Sources & provenance
Tap a source to open the original guideline or review in a new tab.
- ACOG Practice Bulletin 175: Ultrasound in Pregnancy — ACOG
- Cochrane review: Amnioinfusion for potential or suspected umbilical cord compression in labour — Cochrane
Plain-language paraphrase. Re-verify before publish.
Last reviewed: 2026-07-03
Further reading — canonical references
Read the source material directly. Each link opens the publisher's own current guidance in a new tab — cross-check what we summarize against what they say.
Tier 1 · Clinical guidelines
Tier 2 · Systematic reviews
Educational only. Guidelines evolve — the linked publisher pages will reflect newer guidance than any static snapshot.
Version history — v1.0.0
v1.0.0 · 2026-07-03 · LlaMamma editors
Initial oligohydramnios topic.
New guidance from ACOG, WHO, Evidence Based Birth, or other listed sources is recorded here and can be updated remotely without a new app release.