Oligohydramnios is too little amniotic fluid for the stage of pregnancy, usually defined on ultrasound as a deepest vertical pocket under 2 cm or an amniotic fluid index (AFI) of 5 cm or less. The most common causes are ruptured membranes, placental insufficiency, a pregnancy past its due date, and fetal kidney or urinary tract problems. The nursing diagnoses used most often are Risk for Disturbed Maternal-Fetal Dyad, Anxiety, Labor Pain, and Risk for Infection. Nursing care centers on fetal surveillance, recognizing cord compression, position changes, amnioinfusion when ordered, infection prevention, and teaching fetal movement awareness.
At a glance
- What it is
- Low amniotic fluid volume for gestational age. Without enough fluid to cushion it, the umbilical cord is easily squeezed, and early, long-lasting oligohydramnios can limit fetal lung and limb development.
- Who is at risk
- Pregnant people with ruptured membranes, hypertension or preeclampsia, a growth-restricted fetus, a late-term or post-term pregnancy, a fetus with kidney or bladder outlet problems, the donor twin in twin-twin transfusion, and those taking ACE inhibitors, ARBs, or NSAIDs after 20 weeks.
- Key signs
- Fundal height smaller than expected for dates, fetal parts easy to feel, decreased fetal movement, leaking fluid, and variable decelerations on the fetal monitor, especially in labor.
- Nursing focus
- Monitor fetal heart rate and fetal movement, check for rupture of membranes, reposition for cord compression, assist with amnioinfusion if ordered, watch for infection, and teach warning signs.
- Act now
- Report recurrent variable decelerations, a prolonged deceleration, minimal or absent variability, or a sudden drop in fetal heart rate at once. Turn the patient to her side while you call for help, and check for cord prolapse if the membranes have ruptured.
Pathophysiology of oligohydramnios
In the second half of pregnancy most amniotic fluid is fetal urine, with a smaller share from fetal lung fluid. The fetus removes fluid by swallowing it. Fluid volume falls when fluid leaks out, when the fetus makes less urine, or when the fetal urinary tract is blocked.
Ruptured membranes are the most common cause: fluid simply drains away. Placental insufficiency, from hypertension, preeclampsia, or a placenta that is aging in a late-term or post-term pregnancy, lowers blood flow to the fetus. The fetus redirects blood to the brain and heart and away from the kidneys, so it makes less urine. That is why low fluid is often a sign of fetal stress and is linked with fetal growth restriction. Fetal causes include absent kidneys (renal agenesis), polycystic kidneys, and bladder outlet obstruction. Medicines such as ACE inhibitors, angiotensin receptor blockers, and NSAIDs after about 20 weeks can reduce fetal kidney function.
Low fluid matters for three reasons. First, the cord loses its cushion and is compressed during fetal movement and contractions, which shows up as variable decelerations. Second, when severe oligohydramnios starts early in the second trimester, the lungs cannot expand and develop normally (pulmonary hypoplasia), and the cramped fetus may develop limb contractures and the facial features of Potter sequence. Third, the risks of meconium-stained fluid, abnormal fetal heart rate patterns, and cesarean birth are higher.
How amniotic fluid is measured
| Measurement | Oligohydramnios when | Notes |
|---|---|---|
| Deepest vertical pocket (DVP), also called single deepest pocket | Under 2 cm | The single largest pocket of fluid free of cord and fetal parts. ACOG and SMFM prefer it, because it labels fewer pregnancies as low without worse outcomes. |
| Amniotic fluid index (AFI) | 5 cm or less | The sum of the deepest pockets in four quadrants of the uterus. Still widely reported, especially on biophysical profiles. |
Fluid normally varies with gestational age, and units may use different methods and cut-offs. Check the ultrasound report and your facility’s criteria before you document or report a result.
Nursing assessment
Subjective data
- Fetal movement pattern, and any decrease or change from her usual pattern
- Leaking fluid, a gush, or wetness that soaks her underwear, with the time it started and the color and odor of the fluid
- Contractions, cramping, pelvic pressure, or bleeding
- Gestational age and dating, including whether she is past her due date
- History of hypertension, preeclampsia, diabetes, kidney disease, lupus, or a previous growth-restricted baby or stillbirth
- All medicines, including over-the-counter pain relievers such as ibuprofen, and blood pressure medicines
- Fluid intake, vomiting, or diarrhea; her understanding of the diagnosis, worries about the baby, and support at home
Objective data
- Fundal height compared with gestational age; fetal parts easy to palpate
- Ultrasound report: DVP or AFI, estimated fetal weight and growth, anatomy (kidneys and bladder), presentation, and Doppler studies if done
- Fetal heart rate baseline, variability, accelerations, and decelerations on the monitor, and nonstress test or biophysical profile results
- Signs of rupture of membranes: pooling, nitrazine, fern, or other rupture tests as ordered
- Blood pressure, heart rate, temperature, and urine protein, to look for preeclampsia or infection
- Color of the amniotic fluid once membranes are ruptured (clear, meconium-stained, bloody, or foul-smelling)
- Contraction frequency, duration, and uterine resting tone
Nursing diagnoses used with oligohydramnios
- Risk for Disturbed Maternal-Fetal Dyad — pregnancy complication with risk of cord compression, fetal growth problems, and preterm birth
- Anxiety — uncertainty about the baby’s health, testing, and the plan for birth
- Labor Pain — during induction or labor, often longer because of cervical ripening
- Risk for Infection — ruptured membranes, internal monitors, amnioinfusion, and repeated vaginal exams
- Fear — when birth may be preterm or a fetal anomaly has been found
- Risk for Bleeding — when placental insufficiency comes with preeclampsia or abruption
- Disturbed Sleep Pattern — frequent monitoring, hospitalization, and worry
- Grieving — when a severe fetal anomaly or loss is diagnosed
Worked care plans
Four plans in the same ADPIE shape. The scenario is a 28-year-old, gravida 1 para 0, at 41 weeks 3 days. She calls because the baby “has been moving less since yesterday.” In triage the nonstress test is reactive. Fundal height is 36 cm. Ultrasound shows a deepest vertical pocket of 1.6 cm (AFI 4.2 cm), a head-down fetus with estimated weight appropriate for dates, and normal kidneys and bladder. Rupture testing is negative. Blood pressure is 118/74, heart rate 84, and temperature 36.9 °C (98.4 °F); urine protein is negative. She is admitted for induction of labor. After cervical ripening and oxytocin, the provider ruptures her membranes at 5 cm and a small amount of clear fluid drains. At 6 cm she has recurrent variable decelerations with moderate variability. An intrauterine pressure catheter is placed and amnioinfusion is ordered.
1. Risk for Disturbed Maternal-Fetal Dyad
RiskSubjective: “The baby isn’t kicking like before.” “Is the baby getting enough oxygen?”
Objective: 41 weeks 3 days, DVP 1.6 cm, scant clear fluid at rupture, recurrent variable decelerations with each contraction at 6 cm, baseline 135, moderate variability. Oxytocin infusing.
Risk for Disturbed Maternal-Fetal Dyad; associated conditions: pregnancy complications (oligohydramnios, late-term pregnancy, and umbilical cord compression) and treatment regimen (oxytocin induction).
Risk diagnosis: risk factors and associated conditions only, because harm to the mother or fetus has not occurred.
- Fetal heart rate keeps moderate variability, and decelerations lessen or resolve
- Any Category II or III change is recognized and reported at once
- Birth occurs without fetal compromise that could have been prevented
- Use continuous electronic fetal monitoring and interpret the tracing at the frequency your unit policy sets for her stage of labor
- With variable decelerations, turn her from side to side or to hands and knees, and check for cord prolapse with a vaginal exam if a sudden or prolonged drop occurs
- Watch for tachysystole; reduce or stop oxytocin per protocol and notify the provider if contractions are too frequent or the tracing worsens
- Set up and run amnioinfusion as ordered through the intrauterine pressure catheter, using the solution, temperature, and rate in the order
- During amnioinfusion, monitor uterine resting tone and make sure fluid is draining from the vagina, so the uterus is not overdistended
- Report recurrent decelerations that do not resolve, prolonged decelerations, or minimal or absent variability, and prepare for operative birth if the provider decides it is needed
- Tell the newborn team about the low fluid and the color of the fluid before birth
After repositioning and one hour of amnioinfusion, the variable decelerations became occasional and shallower, and variability stayed moderate. Fluid drained steadily and resting tone stayed soft. She delivered vaginally 6 hours later. Goal met.
2. Anxiety
Problem-focusedSubjective: “Low fluid sounds like the baby is in danger.” “Why does the heart rate keep dropping?” “I didn’t drink enough water, did I do this?”
Objective: Watches the monitor constantly, asks the same question several times, tense posture, tearful when the alarm sounds. Partner is present and also asking questions.
Anxiety related to perceived threat to the baby’s health and unfamiliar procedures, as evidenced by repeated questions, expressed guilt and worry, tension, and constant watching of the fetal monitor.
- Patient states, in her own words, why fluid is low and what the plan of care is
- Patient reports feeling calmer and uses at least one coping method that helps her
- Patient and partner know they can ask questions at any time
- Ask what she has heard or read, and correct misinformation in plain language
- Explain that low fluid late in pregnancy is common and is usually linked to the placenta aging, not to anything she did
- Explain each step before you do it: repositioning, the internal catheter, and amnioinfusion
- Show her and her partner what a reassuring tracing looks like and what the team is watching for
- Stay with her during tracing changes, speak calmly, and explain what you are doing and why
- Teach slow breathing and involve her partner in comfort measures
She said, “The fluid is low because I’m past my date, and the saline gives the cord some room.” She used slow breathing with her partner during contractions and said she felt “more in control.” Goal met.
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3. Labor Pain
Problem-focusedSubjective: “The contractions are much stronger since you broke my water.” “I can’t get comfortable on my side.” Rates pain 8 out of 10 at the peak of contractions.
Objective: 6 cm, contractions every 2 to 3 minutes, moaning and gripping the bed rail, facial grimacing, restless between contractions. Needs to stay off her back for the fetal heart rate.
Labor Pain related to uterine contractions and cervical dilation during induced labor, as evidenced by reported pain of 8 out of 10, grimacing, moaning, and restlessness.
- Patient reports pain at a level she finds acceptable
- Patient uses the comfort methods she chooses, with support
- Comfort positions keep her off her back to protect fetal oxygenation
- Assess pain with a scale and her own words, and ask about her birth preferences
- Offer side-lying with a peanut ball, hands and knees, or upright positions that also help the fetal heart rate
- Coach breathing, offer back pressure, massage, and a cool cloth, and involve her partner
- Request an epidural or other analgesia as she wishes and as ordered; check blood pressure and fetal heart rate after placement and dosing per protocol
- Keep the bed linens and pads changed often, because amnioinfusion fluid drains continuously
- Report pain that is constant between contractions or a hard, tender uterus, which may mean abruption or overdistension
After an epidural she rated her pain 3 out of 10 and rested on her side with a peanut ball. Blood pressure stayed within her ordered parameters. Goal met.
4. Risk for Infection
RiskSubjective: Denies chills. “Is it normal to keep leaking all this fluid?”
Objective: Membranes ruptured, intrauterine pressure catheter in place, amnioinfusion running, several vaginal exams during the induction. Temperature 37.0 °C (98.6 °F), heart rate 88, fetal baseline 135. Fluid clear with no odor. Group B strep status negative.
Risk for Infection; associated condition: invasive procedures (artificial rupture of membranes, intrauterine pressure catheter, amnioinfusion, and repeated vaginal examinations).
Risk diagnosis: risk factors and associated conditions only, because infection has not occurred.
- Patient remains free of signs of intraamniotic infection through birth and the postpartum period
- Early signs of infection are found and reported at once
- Check temperature at the frequency your unit sets after rupture of membranes, and more often if it rises
- Watch for maternal fever, maternal or fetal tachycardia, uterine tenderness, and cloudy or foul-smelling fluid
- Limit vaginal exams to those needed, and use sterile technique for exams, the catheter, and amnioinfusion tubing
- Change pads and linens often and give perineal care
- Give antibiotics as ordered, including group B strep prophylaxis when indicated
- Report fever or other signs of infection to the provider and tell the newborn team
Through birth and the first 24 hours postpartum her temperature stayed normal, fluid and lochia had no foul odor, and the uterus was not tender. The newborn showed no signs of infection. Goal met.
Interventions and rationales
Client and family teaching
- Oligohydramnios means low fluid around the baby; it is often linked with being past your due date or with the placenta, and it is not caused by anything you did
- Keep every nonstress test, ultrasound, and prenatal visit so the team can check the baby and the fluid
- Pay attention to your baby’s movements every day and call right away 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, fluid that is green, brown, or foul-smelling, bleeding, regular contractions before 37 weeks, fever, or severe belly pain
- 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
- Drink fluids as your provider advises and rest on your side when lying down
- Do not take ibuprofen, naproxen, or other NSAIDs in pregnancy unless your provider tells you to, and check with your provider before stopping or starting any blood pressure medicine
- Your provider may recommend induction or an earlier birth if fluid stays low or tests change; ask about the plan and what to expect in labor
NurseStudyPrep.com
You’ve read the care plan. Now answer one.
A priority item in the NCLEX format. On Prep, every option gets a written rationale — including the three that are wrong.
A client in labor at 40 weeks has oligohydramnios. Her membranes ruptured 2 hours ago, and a vaginal exam 20 minutes ago showed 6 cm with no cord felt. The fetal monitor now shows variable decelerations with each contraction, with a baseline of 140 and moderate variability. Which action should the nurse take first?
Why B. Variable decelerations mean the cord is being compressed, and low fluid leaves it unprotected. Repositioning is the quickest nursing action that can relieve pressure on the cord. Option A is not indicated yet; moderate variability shows the fetus is coping, and the first step is to try to relieve the cause. Option C may help if decelerations keep recurring, but it needs a provider’s order and an internal catheter, and it must not delay repositioning. Option D ignores a pattern that needs action now and must be reported. Prep also explains why each wrong option looks reasonable.
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Frequently asked questions
What is the nursing diagnosis for oligohydramnios?
Oligohydramnios is a medical diagnosis, so nurses choose NANDA-I diagnoses for the patient’s response. Common ones are Risk for Disturbed Maternal-Fetal Dyad, Anxiety, Labor Pain, Risk for Infection, Fear, and Disturbed Sleep Pattern.
What measurement is considered oligohydramnios?
A deepest vertical pocket under 2 cm, or an amniotic fluid index of 5 cm or less. ACOG and SMFM prefer the deepest vertical pocket because it labels fewer pregnancies as low without worse outcomes. Check your facility’s criteria.
What is the priority nursing concern with oligohydramnios?
Fetal oxygenation. Low fluid leaves the cord unprotected, so the nurse watches for variable decelerations and other tracing changes, repositions the mother first, and reports changes at once.
What is the difference between oligohydramnios and polyhydramnios?
Oligohydramnios is too little fluid, often from ruptured membranes, placental insufficiency, a post-term pregnancy, or fetal kidney problems. Polyhydramnios is too much fluid, often linked to diabetes or a fetus that cannot swallow. Low fluid raises the risk of cord compression; high fluid raises the risk of cord prolapse and preterm labor.
Can drinking more water increase amniotic fluid?
Maternal hydration can raise the fluid measurement for a short time in isolated oligohydramnios with intact membranes, but it has not been shown to improve outcomes for the baby. Follow your provider’s advice, and keep all fetal testing appointments.
When is delivery recommended for oligohydramnios?
ACOG suggests birth at 36 0/7 to 37 6/7 weeks for isolated persistent oligohydramnios. Birth may be earlier when there is growth restriction, preeclampsia, or an abnormal tracing, and timing after preterm rupture of membranes follows separate guidance. The provider decides the plan for each patient.
References
- American College of Obstetricians and Gynecologists. Medically Indicated Late-Preterm and Early-Term Deliveries. Committee Opinion No. 831, 2021.
- American College of Obstetricians and Gynecologists. Antepartum Fetal Surveillance. Practice Bulletin No. 229, 2021.
- American College of Obstetricians and Gynecologists. Prelabor Rupture of Membranes. Practice Bulletin No. 217, 2020.
- American College of Obstetricians and Gynecologists. Management of Intrapartum Fetal Heart Rate Tracings. Practice Bulletin No. 116, 2010.
- U.S. Food and Drug Administration. FDA recommends avoiding use of NSAIDs in pregnancy at 20 weeks or later because they can result in low amniotic fluid. Drug Safety Communication, 2020.
- Hofmeyr, G. J., & Gülmezoglu, A. M. Maternal hydration for increasing amniotic fluid volume in oligohydramnios and normal amniotic fluid volume. Cochrane Database of Systematic Reviews, 2002.
- Hofmeyr, G. J., & Lawrie, T. A. Amnioinfusion for potential or suspected umbilical cord compression in labour. Cochrane Database of Systematic Reviews, 2012.
- Nabhan, A. F., & Abdelmoula, Y. A. Amniotic fluid index versus single deepest vertical pocket as a screening test for preventing adverse pregnancy outcome. Cochrane Database of Systematic Reviews, 2008.
- Rabie, N., Magann, E., Steelman, S., & Ounpraseuth, S. Oligohydramnios in complicated and uncomplicated pregnancy: a systematic review and meta-analysis. Ultrasound in Obstetrics & Gynecology, 2017;49(4):442–449.
- Shrem, G., Nagawkar, S. S., Hallak, M., & Walfisch, A. Isolated oligohydramnios at term as an indication for labor induction: a systematic review and meta-analysis. Fetal Diagnosis and Therapy, 2016;40(3):161–173.
- Morris, R. K., Meller, C. H., Tamblyn, J., et al. Association and prediction of amniotic fluid measurements for adverse pregnancy outcome: systematic review and meta-analysis. BJOG, 2014;121(6):686–699.
- 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.
Amniotic fluid cut-offs and measurement methods, fetal monitoring frequency, amnioinfusion solutions and rates, oxytocin protocols, temperature thresholds for infection, antibiotic and corticosteroid use, and the timing of birth vary by patient, by provider, and by facility. Follow the provider’s written orders, current ACOG and SMFM guidance, and your own institution’s policies. This page supports study and does not replace course instruction or clinical judgment.
