Polyhydramnios is too much amniotic fluid around the fetus, diagnosed on ultrasound after 20 weeks when the amniotic fluid index (AFI) is 24 cm or more or the deepest vertical pocket is 8 cm or more. Most mild cases have no known cause, but diabetes, fetal anomalies that affect swallowing, multiple pregnancy, and fetal anemia or infection must be looked for. The nursing diagnoses used most often are Risk for Disturbed Maternal-Fetal Dyad, Ineffective Breathing Pattern, Impaired Comfort, and Anxiety. Nursing care centers on fetal surveillance, watching for preterm labor, breathing support, readiness for cord prolapse when the membranes rupture, and teaching warning signs.
At a glance
- What it is
- Excess amniotic fluid, usually because the fetus swallows too little fluid or makes too much urine. Also called hydramnios.
- Who is at risk
- Pregnant people with diabetes, twins or other multiples (especially twin-twin transfusion), and a fetus with a swallowing, bowel, nerve, heart, or chromosome problem, fetal anemia, or fetal infection.
- Key signs
- Fundal height larger than expected for dates, a tense shiny abdomen, fetal parts hard to feel, shortness of breath especially lying flat, abdominal tightness, back pain, heartburn, and leg swelling.
- Nursing focus
- Monitor fetal heart rate and fetal movement, watch for contractions and cervical change, support breathing and comfort, check glucose control, prepare for amnioreduction if ordered, and teach warning signs.
- Act now
- When the membranes rupture, check the fetal heart rate right away. A sudden drop in fetal heart rate or cord seen or felt in the vagina may be cord prolapse; call for help, lift the presenting part off the cord, and follow your emergency protocol. Report vaginal bleeding with a hard, painful uterus at once.
Pathophysiology of polyhydramnios
Amniotic fluid is kept in balance by two main pathways. In the second half of pregnancy most fluid comes from fetal urine, and most is removed when the fetus swallows it and absorbs it through the gut. Fluid builds up when the fetus cannot swallow or absorb it, or when the fetus makes more urine than usual.
Causes of reduced swallowing include esophageal or duodenal atresia, neurologic or muscle problems, and some chromosome conditions such as trisomy 18. Increased urine output happens with maternal diabetes (high glucose crosses to the fetus and causes fetal polyuria), the recipient twin in twin-twin transfusion syndrome, and high-output states such as fetal anemia or hydrops. Most cases, especially mild ones, are idiopathic, meaning no cause is found. A normal anatomy scan does not rule out every anomaly, so the pediatric team needs to know about polyhydramnios at birth.
The overstretched uterus causes most of the maternal problems. It presses up on the diaphragm and stomach, causing breathlessness and heartburn, and it is more likely to contract early. The fetus can move freely, so breech and transverse lies are more common. When the membranes rupture, the rush of fluid can carry the cord down (cord prolapse) and a sudden drop in uterine size can separate the placenta (abruption). After birth an overstretched uterus may not contract well, raising the risk of postpartum hemorrhage.
How severity is graded
| Severity | Ultrasound finding |
|---|---|
| Mild | AFI 24 to 29.9 cm, or deepest vertical pocket 8 to 11 cm. Most cases, and most idiopathic cases, are mild. |
| Moderate | AFI 30 to 34.9 cm, or deepest vertical pocket 12 to 15 cm. |
| Severe | AFI 35 cm or more, or deepest vertical pocket 16 cm or more. More likely to have a fetal cause and to need delivery at a center with a NICU. |
These are the cut-offs used by the Society for Maternal-Fetal Medicine. Some units use an AFI of 25 cm, so check the ultrasound report and your facility’s criteria.
Nursing assessment
Subjective data
- Shortness of breath, especially lying flat, and how many pillows she sleeps on
- Abdominal tightness, pressure, back or pelvic pain, and heartburn
- Fetal movement pattern, including any decrease
- Tightening or contractions, pelvic pressure, change in vaginal discharge, leaking fluid, or bleeding
- Diabetes history, glucose log, and how she is managing diet and any medicines
- Recent illness or rash (fetal infection), Rh status and antibody history, and twin pregnancy details
- Her understanding of the diagnosis, worries about the baby, sleep, and support at home
Objective data
- Fundal height compared with gestational age; a tense, shiny abdomen; fetal parts and lie hard to palpate
- Blood pressure, heart rate, respiratory rate, oxygen saturation, and work of breathing in different positions
- Fetal heart rate baseline, variability, accelerations, and decelerations on the monitor
- Contraction frequency on the tocometer and cervical findings as examined by the provider
- Ultrasound report: AFI or deepest vertical pocket, fetal growth, anatomy, presentation, and placenta
- Glucose results, blood type and antibody screen, and infection testing as ordered
- Edema, weight trend, and urine protein as ordered
Nursing diagnoses used with polyhydramnios
- Risk for Disturbed Maternal-Fetal Dyad — pregnancy complication with risk of preterm birth, malpresentation, cord prolapse, and abruption
- Ineffective Breathing Pattern — the enlarged uterus limits how far the diaphragm can move
- Impaired Comfort — abdominal tightness, back pain, heartburn, and poor sleep from uterine overdistension
- Anxiety — uncertainty about the cause and what it means for the baby
- Acute Pain — severe distension, contractions, or after amnioreduction
- Risk for Bleeding — abruption after sudden decompression, and uterine atony after birth
- Risk for Unstable Blood Glucose Level — when diabetes is present
- Deficient Knowledge — warning signs, kick counting, and when to come in
Worked care plans
Four plans in the same ADPIE shape. The scenario is a 33-year-old, gravida 2 para 1, at 31 weeks. She was diagnosed with gestational diabetes at 26 weeks and her home glucose log shows several readings above the targets her provider set. Her 20-week anatomy scan was normal. She comes to labor and delivery because she “can’t catch her breath” and her belly “feels like it will burst.” Fundal height is 37 cm. Ultrasound shows an AFI of 33 cm (moderate polyhydramnios) and a breech fetus that changes position easily. Blood pressure is 122/74, heart rate 104, respiratory rate 24, and oxygen saturation 96% on room air sitting up. The fetal heart rate baseline is 145 with moderate variability and accelerations (Category I). The tocometer shows irregular tightening and the provider finds the cervix closed. She is admitted to the antepartum unit for monitoring, glucose management, and evaluation.
1. Risk for Disturbed Maternal-Fetal Dyad
RiskSubjective: “The baby is moving all over the place.” “My sugars have been high some mornings.”
Objective: 31 weeks, AFI 33 cm, breech and unstable lie, irregular uterine tightening, cervix closed. Fetal heart rate Category I. Gestational diabetes with readings above target.
Risk for Disturbed Maternal-Fetal Dyad with risk factors of glucose levels above target and an unstable fetal lie; associated conditions: polyhydramnios and gestational diabetes.
Risk diagnosis: risk factors only, because harm to the mother or fetus has not occurred.
- Fetal heart rate tracing stays Category I, and any change is recognized and reported at once
- Signs of preterm labor, rupture of membranes, cord prolapse, or abruption are found early
- Glucose readings stay within the targets set by her provider
- Monitor fetal heart rate and contractions at the frequency ordered, and interpret the tracing with each check
- Assess for contractions, pelvic pressure, back pain, leaking fluid, and bleeding each shift and with any complaint
- If the membranes rupture, check the fetal heart rate right away and inspect for cord; keep the call light in reach and teach her to call at the first gush
- Check capillary glucose as ordered, give insulin as prescribed, and arrange a dietitian review
- Give antenatal corticosteroids if the provider orders them for risk of preterm birth, and document the time of each dose
- Report Category II or III findings, regular contractions, bleeding, or a hard painful uterus to the provider immediately
Over 72 hours the tracing stayed Category I, tightening stayed irregular with no cervical change, and membranes stayed intact. Fasting and after-meal glucose readings came within her targets after her insulin was adjusted. Goal met; continue surveillance as ordered.
2. Ineffective Breathing Pattern
Problem-focusedSubjective: “I have to sleep sitting up on three pillows.” “Walking to the bathroom wears me out.”
Objective: Respiratory rate 24, shallow breaths, heart rate 104, oxygen saturation 96% sitting up and lower when lying flat. Lungs clear. Fundal height 37 cm at 31 weeks.
Ineffective Breathing Pattern related to body position and upward pressure of the overdistended uterus on the diaphragm, as evidenced by dyspnea, orthopnea, tachypnea, and shallow breathing.
- Patient reports easier breathing at rest and can sleep with fewer awakenings
- Respiratory rate and oxygen saturation stay within the parameters ordered for her
- Worsening breathing or new crackles are reported at once
- Assess respiratory rate, effort, oxygen saturation, and lung sounds at the frequency ordered and with any complaint
- Position her semi-Fowler’s or upright with a lateral tilt, and avoid lying flat on her back
- Cluster care and plan rest periods; help with walking and hygiene as needed
- Give oxygen as ordered if saturation falls below the ordered level
- If the provider plans amnioreduction, explain the procedure, confirm consent is documented, monitor the fetal heart rate and contractions before and after, and watch for leaking fluid, bleeding, abdominal pain, and fever
- After any invasive procedure, check that Rh immune globulin is given if she is Rh negative and unsensitized, as ordered
- Report chest pain, new crackles, or sudden worsening dyspnea, which may point to another cause such as preeclampsia or pulmonary edema
Positioned upright with a lateral tilt, she said breathing was “much easier.” Respiratory rate came down to 20 and saturation stayed within ordered parameters. No oxygen was needed and amnioreduction was not required at this stage. Goal partly met; reassess daily because fluid may keep increasing.
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3. Impaired Comfort
Problem-focusedSubjective: “My belly is so tight it hurts.” “My back aches and I’ve had heartburn every night.” “I can’t get comfortable to sleep.”
Objective: Tense, shiny abdomen with new striae, frequent shifting in bed, rubbing her lower back, mild ankle edema. Pain rated 5 out of 10 as “tightness.”
Impaired Comfort related to uterine overdistension from excess amniotic fluid, as evidenced by reports of abdominal tightness, back pain, heartburn, inability to relax, and disturbed sleep.
- Patient reports comfort at a level she finds acceptable
- Patient uses at least two comfort measures on her own
- Patient sleeps for longer stretches
- Assess discomfort with a pain scale and her own words, and ask what makes it better or worse
- Distinguish steady tightness from rhythmic contractions or constant severe pain; report regular contractions or sudden severe pain with a firm uterus
- Offer side-lying with pillows between the knees and under the abdomen, back massage, and warm (not hot) packs to the lower back
- Suggest small, frequent meals within her diabetes meal plan, staying upright after eating, and antacids if ordered
- Elevate legs when sitting and encourage short, frequent walks as tolerated
- Give analgesics as ordered; avoid NSAIDs unless the provider orders them, because they can affect the fetal heart and kidneys
By day 2 she rated her discomfort 2 out of 10, used side-lying with pillows and small meals on her own, and slept for 4-hour stretches. Goal met.
4. Anxiety
Problem-focusedSubjective: “Does this mean something is wrong with my baby?” “I looked it up and it said birth defects.” “I keep lying awake thinking about it.”
Objective: Asks the same questions several times, restless, tearful at times, heart rate rises when the topic is discussed. Partner works nights and her 3-year-old is with a relative.
Anxiety related to uncertainty about the cause of polyhydramnios and threat to the baby’s health, as evidenced by repeated questions, expressed worry about birth defects, restlessness, and difficulty sleeping.
- Patient states, in her own words, what polyhydramnios is and what the plan of care involves
- Patient reports feeling calmer and names at least one coping strategy that helps
- Patient knows who to ask about test results and next steps
- Ask what she has read or been told, and correct misinformation in plain language
- Explain that most mild-to-moderate cases with a normal anatomy scan have no anomaly found, while being honest that some problems are found only after birth
- Arrange time with the provider or maternal-fetal medicine to discuss results, and offer genetic counseling if the provider recommends further testing
- Show her the monitor and explain what a reassuring tracing looks like
- Involve her partner by phone or video in teaching, and offer social work for childcare and practical support
- Teach slow breathing and other calming methods she prefers; screen for depression as per unit policy
After meeting with maternal-fetal medicine she explained, “It’s mostly from my sugars, and they’ll check the baby’s swallowing after birth.” She used slow breathing at night and said she felt “less panicky.” Goal met; continue support at each visit.
Interventions and rationales
Client and family teaching
- Polyhydramnios means extra fluid around the baby; many cases are mild and no cause is found
- Keep every ultrasound and prenatal appointment so fluid, growth, and position can be checked
- Pay attention to your baby’s movements each day and call if they slow down or change, using the method your provider teaches
- Go to labor and delivery right away for a gush or steady leak of fluid, regular tightening or contractions before 37 weeks, vaginal bleeding, severe or constant belly pain, or much worse breathlessness
- If your water breaks and you feel or see the cord, call 911, get on your hands and knees with your hips higher than your chest, and do not try to push the cord back
- If you have diabetes, check your glucose and follow your meal plan and medicines as prescribed; this can help the fluid level
- Sleep and rest on your side or propped up with pillows; small meals help heartburn and breathlessness
- Do not take ibuprofen or other NSAIDs in pregnancy unless your provider tells you to
- Plan to give birth where the team can care for your baby; tell the staff about the extra fluid when you arrive
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A client at 34 weeks with polyhydramnios has a sudden gush of fluid. The nurse sees a loop of umbilical cord at the vaginal opening, and the fetal heart rate has dropped to 80/min. Which action should the nurse take first?
Why B. The fetal heart rate shows the cord is being compressed. Relieving pressure on the cord restores blood flow to the fetus, and the nurse keeps the presenting part elevated until the emergency birth. Option A is never done; handling the cord causes spasm and it cannot be replaced safely. Option C protects a cord outside the body but does not relieve compression. Option D may be ordered as supportive care, but it does not fix the cause and must not delay relieving pressure on the cord. Prep also explains why each wrong option looks reasonable.
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Frequently asked questions
What is the nursing diagnosis for polyhydramnios?
Polyhydramnios is a medical diagnosis, so nurses choose NANDA-I diagnoses for the patient’s response. Common ones are Risk for Disturbed Maternal-Fetal Dyad, Ineffective Breathing Pattern, Impaired Comfort, Anxiety, Risk for Bleeding, and Deficient Knowledge.
What AFI is considered polyhydramnios?
An amniotic fluid index of 24 cm or more, or a deepest vertical pocket of 8 cm or more, after 20 weeks. Some units use an AFI of 25 cm. Mild is an AFI of 24 to 29.9 cm, moderate 30 to 34.9 cm, and severe 35 cm or more.
What is the priority nursing concern with polyhydramnios?
Fetal oxygenation. The nurse watches the fetal heart rate, especially right after the membranes rupture, because cord prolapse and placental abruption are more likely. Preterm labor and maternal breathing difficulty come next.
What is the difference between polyhydramnios and oligohydramnios?
Polyhydramnios is too much fluid, often linked to diabetes or a fetus that cannot swallow. Oligohydramnios is too little fluid, defined as an AFI of 5 cm or less or a deepest pocket under 2 cm, and is often linked to ruptured membranes, placental problems, or fetal kidney problems.
How is polyhydramnios treated?
By treating the cause when there is one, such as improving glucose control in diabetes, and by monitoring. Amnioreduction may be done for severe breathlessness or discomfort. Indomethacin is not recommended just to lower the fluid. Mild idiopathic polyhydramnios on its own is not a reason for induction before 39 weeks.
Why is the newborn checked for esophageal atresia?
A fetus with a blocked esophagus cannot swallow amniotic fluid, so fluid builds up. After birth, signs include excess drooling, choking, coughing, or color change with feeds. Tell the newborn team about the polyhydramnios and follow their orders before the first feed.
References
- Society for Maternal-Fetal Medicine, Dashe, J. S., Pressman, E. K., & Hibbard, J. U. SMFM Consult Series #46: Evaluation and management of polyhydramnios. American Journal of Obstetrics and Gynecology, 2018;219(4):B2–B8.
- American College of Obstetricians and Gynecologists. Indications for Outpatient Antenatal Fetal Surveillance. Committee Opinion No. 828, 2021.
- Herdman, T. H., Kamitsuru, S., & Lopes, C. T. (Eds.). NANDA International Nursing Diagnoses: Definitions and Classification, 2024–2026. Thieme.
- Lowdermilk, D. L., Cashion, M. C., Perry, S. E., Alden, K. R., & Olshansky, E. Maternity and Women’s Health Care. Elsevier.
- Ackley, B. J., Ladwig, G. B., Makic, M. B. F., Martinez-Kratz, M. R., & Zanotti, M. Nursing Diagnosis Handbook: An Evidence-Based Guide to Planning Care (13th ed.). Elsevier, 2023.
- Silvestri, L. A. Saunders Comprehensive Review for the NCLEX-RN Examination. Elsevier, 2023.
- Hamza, A., Herr, D., Solomayer, E. F., & Meyberg-Solomayer, G. Polyhydramnios: Causes, diagnosis and therapy. Geburtshilfe und Frauenheilkunde, 2013;73(12):1241–1246.
- Magann, E. F., Chauhan, S. P., Doherty, D. A., et al. A review of idiopathic hydramnios and pregnancy outcomes. Obstetrical & Gynecological Survey, 2007;62(12):795–802.
- Pilliod, R. A., Page, J. M., Burwick, R. M., et al. The risk of fetal death in nonanomalous pregnancies affected by polyhydramnios. American Journal of Obstetrics and Gynecology, 2015;213(3):410.e1–410.e6.
- Abele, H., Starz, S., Hoopmann, M., et al. Idiopathic polyhydramnios and postnatal abnormalities. Fetal Diagnosis and Therapy, 2012;32(4):251–255.
Diagnostic cut-offs for amniotic fluid, fetal monitoring frequency, glucose targets, oxygen and vital sign parameters, criteria for amnioreduction, medicines, and timing of birth vary by patient, by provider, and by facility. Follow the provider’s written orders, current SMFM and ACOG guidance, and your own institution’s policies. This page supports study and does not replace course instruction or clinical judgment.
