A hydatidiform mole (molar pregnancy) is an abnormal pregnancy in which the placental tissue (trophoblast) overgrows into fluid-filled vesicles and a normal fetus does not develop. It is the most common form of gestational trophoblastic disease. The priority NANDA-I nursing diagnosis is usually Risk for Bleeding, because the overgrown tissue is very vascular and bleeding can be heavy before, during, and after the uterus is emptied. Common companion diagnoses are Grieving for the lost pregnancy, Anxiety about cancer risk and future fertility, Nausea, and Inadequate Health Knowledge about the months of hCG follow-up that come after treatment. Nursing care centers on watching for bleeding and breathing problems around the suction evacuation, giving Rh(D) immune globulin when ordered, supporting the grieving client, and teaching why every follow-up hCG test and reliable contraception matter.
At a glance
- What it is
- An abnormal fertilization that produces overgrown, swollen placental villi instead of a normal pregnancy. A complete mole has no fetal tissue; a partial mole may have some abnormal fetal tissue. Both make large amounts of human chorionic gonadotropin (hCG).
- Who gets it
- About 1 in 1,000 pregnancies in the United States and Europe, more often in parts of Asia. Risk is higher at the extremes of reproductive age (teens and especially over 40) and after a previous molar pregnancy.
- Key signs
- Vaginal bleeding in the first trimester is the most common sign. Others include severe nausea and vomiting, a uterus larger than expected for dates, an hCG far higher than expected, no fetal heartbeat, and, less often today, high blood pressure before 20 weeks, signs of hyperthyroidism, or passing grape-like tissue.
- Nursing focus
- Monitor bleeding and vital signs, prepare for suction evacuation, watch breathing during and after the procedure, check Rh status, support grief and anxiety, and teach serial hCG testing and reliable contraception during follow-up.
- Act now
- Escalate heavy bleeding or signs of hypovolemia, shortness of breath, low oxygen saturation, or chest pain around evacuation, severe headache or very high blood pressure, a fast heart rate with fever and agitation (possible thyroid storm), and, at follow-up, an hCG level that stops falling or rises.
Pathophysiology
A hydatidiform mole starts at fertilization. The genetic material is abnormal, so the trophoblast (the tissue that normally forms the placenta) grows out of control and its villi swell with fluid.
- Complete mole — an egg with no maternal genetic material is fertilized, and all of the chromosomes come from the father. No embryo forms. All the villi are swollen, and hCG is often very high.
- Partial mole — a normal egg is fertilized by two sperm (or a sperm that duplicates), giving a triploid set of chromosomes. Some fetal tissue may form, but it cannot survive. Changes are patchier and hCG is often lower.
- Why the signs happen — the fragile, vascular tissue bleeds, so bleeding is the most common sign. High hCG drives nausea and vomiting, ovarian theca lutein cysts, and, because hCG can stimulate the thyroid, hyperthyroidism. The fast-growing tissue can make the uterus larger than expected and can trigger early preeclampsia.
- Risks around evacuation — the uterus can bleed heavily while it is emptied. Rarely, trophoblastic tissue travels to the lungs, or fluid shifts cause respiratory distress, especially when the uterus is very enlarged.
- Gestational trophoblastic neoplasia (GTN) — some molar tissue persists or becomes invasive after evacuation. This happens after roughly 15–20% of complete moles and under 5% of partial moles. It is found by an hCG level that plateaus or rises, and it responds very well to treatment when found early. This is why follow-up hCG testing matters so much.
Complete or partial mole?
| Feature | Complete mole | Partial mole |
|---|---|---|
| Chromosomes | Usually 46, all from the father | Usually 69 (triploid), from both parents |
| Fetal tissue | None | May be present, abnormal and not viable |
| hCG | Often very high | Often lower, may be near the expected range |
| Uterine size | Often larger than dates | Often normal or smaller than dates |
| Classic signs | More likely (heavy nausea, early preeclampsia, hyperthyroidism) | Less likely; often looks like a missed miscarriage |
| Risk of GTN | About 15–20% | Under 5% |
The final type is confirmed by the pathologist after the tissue is removed. Most molar pregnancies today are first suspected on an early ultrasound, before the classic signs appear.
Nursing assessment
Subjective data
- First day of the last menstrual period and how far along the client believes she is
- Vaginal bleeding: when it started, color (dark brown or bright red), amount (pads per hour), clots, and any grape-like tissue passed
- Nausea and vomiting: how often, ability to keep fluids down, weight loss
- Pelvic pain, cramping, or pressure
- Headache, vision changes, or upper abdominal pain (possible preeclampsia)
- Palpitations, heat intolerance, tremor, or anxiety (possible hyperthyroidism)
- Shortness of breath, cough, or chest pain
- Obstetric history, including any previous molar pregnancy or miscarriage, and plans for future pregnancies
- What the client understands about the diagnosis, how she is coping, and who supports her
Objective data
- Vital signs, including blood pressure trends, heart rate, and oxygen saturation
- Amount and character of bleeding by pad count or weight; tissue passed (save it for the provider if facility policy directs)
- Fundal height compared with dates; uterine tenderness
- Signs of hypovolemia: tachycardia, low blood pressure, pallor, cool clammy skin, low urine output
- Signs of dehydration from vomiting: dry mucous membranes, concentrated urine, weight loss
- Breath sounds and work of breathing, especially around the evacuation
- Results the provider orders: quantitative serum hCG, ultrasound, complete blood count, blood type and Rh, crossmatch, thyroid tests, electrolytes, kidney and liver function, urine protein, and a chest x-ray
Nursing diagnoses used with hydatidiform mole
- Risk for Bleeding — the priority before, during, and after evacuation of very vascular tissue
- Grieving — the loss of a pregnancy that was often wanted, along with the hopes attached to it
- Anxiety — worry about cancer, the procedure, months of blood tests, and future pregnancies
- Nausea — high hCG causes severe nausea and vomiting in some clients
- Risk for Imbalanced Fluid Volume — bleeding, vomiting, and IV fluids around the procedure
- Inadequate Health Knowledge — about the hCG follow-up schedule, contraception, and warning signs
- Ineffective Health Self-Management — used later if follow-up tests or contraception are not kept up, such as because of transport or cost problems
Worked care plans
Four plans in the same ADPIE shape. The scenario is a 41-year-old woman, gravida 3 para 2, about 10 weeks pregnant by her last period. She comes to the obstetric triage unit with a week of dark brown vaginal spotting that turned to bright red bleeding today, soaking one pad in about 2 hours, and nausea with vomiting several times a day. Her uterus measures about 14 weeks. Blood pressure is 138/88, heart rate 104, respiratory rate 18, temperature 37.0 °C (98.6 °F), and oxygen saturation 98% on room air. Ultrasound shows a uterus filled with a cystic “snowstorm” pattern and no fetus. Her quantitative hCG is far higher than expected for 10 weeks, hemoglobin is 10.4 g/dL, TSH is low with a mildly raised free T4, urine protein is negative, and her blood type is O Rh-negative. The provider plans suction curettage under anesthesia the same day, with a type and crossmatch, IV fluids, an antiemetic, and Rh(D) immune globulin after the procedure. Pathology later confirms a complete mole.
1. Risk for Bleeding
RiskSubjective: “The bleeding was brown all week, but today it’s bright red.” “I feel a little lightheaded when I stand up.”
Objective: Bright red bleeding soaking one pad in about 2 hours; uterus about 14-week size; heart rate 104, blood pressure 138/88; hemoglobin 10.4 g/dL; scheduled for suction curettage today.
Risk for Bleeding. Risk factors: highly vascular molar tissue, a uterus enlarged beyond dates, and planned uterine evacuation, with existing anemia. Associated conditions: hydatidiform mole and suction curettage.
No “as evidenced by”: hemorrhage has not happened. The plan is to prevent it and catch it early.
- Heart rate and blood pressure stay within the targets the provider sets before and after the procedure
- Uterus is firm and bleeding is light within the time frame expected by the surgical team after evacuation
- Client reports heavy bleeding, dizziness, or clots right away during the stay and after discharge
- Count or weigh pads and record color, clots, and any tissue passed; check vital signs at the frequency ordered and more often if bleeding increases
- Insert a large-bore IV, send the ordered type and crossmatch, and confirm blood is available before the procedure per facility protocol
- Keep her on bed rest or with assistance to stand while she is lightheaded
- After evacuation, check fundal firmness, bleeding, and vital signs per post-procedure orders, and give uterotonic medicines as prescribed
- Report bleeding that soaks a pad in an hour or less, large clots, a rising heart rate, falling blood pressure, or new dizziness, and follow the facility’s hemorrhage protocol
- Recheck hemoglobin as ordered and teach which bleeding is expected at home
Bleeding during the procedure stayed within the range the surgical team expected, and no transfusion was needed. Afterward her uterus was firm, bleeding was light, and her heart rate settled into the 80s with a stable blood pressure. Her hemoglobin the next morning was stable compared with admission. Before discharge she named soaking a pad in an hour, large clots, fever, or feeling faint as reasons to call. Goal met.
2. Grieving
Problem-focusedSubjective: “We already told the kids they were getting a baby.” “I keep thinking I did something to cause this.” “Was there ever a baby at all?”
Objective: Crying on and off, quiet and withdrawn after the ultrasound; partner present and supportive; asks the same questions more than once.
Grieving related to the loss of an expected pregnancy and the change in family plans, associated with hydatidiform mole, as evidenced by crying, self-blame, and expressed sadness about telling her children.
- Client expresses feelings about the loss with her partner and the nurse before discharge
- Client states that the molar pregnancy was not caused by anything she did
- Client names at least two sources of support she plans to use
- Acknowledge the loss as a real pregnancy loss and use the words the client uses for it
- Give private time with her partner and let her talk without rushing to reassure
- Explain simply that a molar pregnancy comes from a problem at fertilization and is not caused by activity, stress, or anything she did
- Answer the question about whether there was a baby honestly and gently, in the terms the provider has used
- Offer spiritual care, social work, and pregnancy loss support resources, and ask what has helped her cope with hard times before
- Prepare her that grief may return during months of blood tests, and that the follow-up visits can feel like reminders
She talked with her partner and the chaplain about the loss and about what to tell her children. She said, “I know now this wasn’t something I caused.” She chose a pregnancy loss support group and her sister as her supports, and accepted a social work call after discharge. Goal met.
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3. Anxiety
Problem-focusedSubjective: “The doctor said something about cancer. Am I going to need chemo?” “I can’t think straight. I didn’t sleep at all.”
Objective: Restless, wringing hands, speaks quickly, has trouble remembering what she was told; heart rate 104 (also linked to bleeding and raised thyroid hormone).
Anxiety related to the threat of cancer, an unfamiliar procedure, and uncertainty about future pregnancies, associated with hydatidiform mole, as evidenced by stated fear, restlessness, poor sleep, and difficulty concentrating.
- Client reports that her anxiety is at a level she can manage before the procedure
- Client restates, in her own words, what the procedure involves and why hCG is tested afterward
- Client uses at least one coping strategy when she feels anxious
- Stay with her, speak calmly, and give information in short pieces; write down key points because anxiety blocks recall
- Explain what to expect before, during, and after suction curettage, including anesthesia and recovery
- Clarify with the provider what has been said about cancer risk, then reinforce it accurately: most molar pregnancies are cured by evacuation, and persistent disease is found early by hCG testing and is very treatable
- Teach slow breathing and offer other strategies she prefers, and let her partner stay with her when possible
- Recognize that a fast heart rate, tremor, and restlessness may also come from bleeding or a high thyroid hormone level, and report these signs rather than treating them as anxiety alone
Before the procedure she rated her anxiety much lower and said, “Most of the time the D&C takes care of it, and the blood tests catch anything left.” She used slow breathing in the pre-op area. She still worries about the follow-up results, which is expected, and has the clinic nurse’s number for questions. Goal partly met.
4. Inadequate Health Knowledge
Problem-focusedSubjective: “Once the surgery is done, it’s over, right?” “We want to try again right away.” “I don’t like the pill, so we just won’t worry about it.”
Objective: Day after evacuation; complete mole confirmed; Rh-negative; has not yet heard about the follow-up hCG schedule; lives about an hour from the clinic.
Inadequate Health Knowledge related to unfamiliarity with molar pregnancy follow-up, associated with complete hydatidiform mole, as evidenced by her belief that treatment is finished, her plan to conceive right away, and no plan for contraception.
- Client explains why serial hCG tests are needed and has her first appointment booked before discharge
- Client chooses a reliable contraceptive method she is willing to use during follow-up
- Client names the warning signs that need a call or an emergency visit
- Explain that hCG should fall steadily to undetectable; a level that stops falling or rises can mean tissue is still growing and needs treatment
- Give the schedule her provider ordered in writing; testing is often every 1–2 weeks until undetectable, then continues for a period that depends on the type of mole
- Explain that a new pregnancy would raise hCG and hide a problem, so pregnancy is delayed until the provider says follow-up is complete
- Review contraception options with the provider; hormonal methods are considered safe during follow-up, and an IUD is usually not placed until hCG is normal
- Confirm Rh(D) immune globulin was given as ordered and document it
- Ask about barriers to getting to appointments and arrange lab draws closer to home if possible
- Use teach-back and include her partner with her permission
She explained, “The blood test has to go down to zero and stay there, and if I got pregnant they couldn’t tell if the mole was back.” She chose a contraceptive patch after talking with the provider. Her first hCG draw is booked at a lab near her home, with results sent to the clinic. She named heavy bleeding, pelvic pain, a cough with blood, or shortness of breath as reasons to call. Rh(D) immune globulin was given before discharge. Goal met.
Interventions and rationales
Client and family teaching
- Light bleeding and cramping are common for a short time after the procedure; call your provider if bleeding gets heavier instead of lighter
- Go to the emergency department for bleeding that soaks a pad in an hour or less, large clots, fainting, or a racing heart
- Call your provider for fever, foul-smelling discharge, or pain that keeps getting worse
- Get every hCG blood test on schedule; your provider will tell you when the testing can stop
- Use reliable birth control until your provider says it is safe to try to get pregnant
- Report a cough with blood, shortness of breath, chest pain, a headache that will not go away, or new vaginal bleeding during follow-up
- If you are Rh-negative, keep the record of your Rh(D) immune globulin shot
- Most people go on to have normal pregnancies later; in a future pregnancy, tell your provider about this one so an early ultrasound can be done
- Grief and worry are normal after a molar pregnancy; reach out to your support people, a counselor, or a pregnancy loss group
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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.
The nurse on a gynecology unit receives report on four clients. Which client should the nurse see first?
Why B. New shortness of breath, crackles, a fast respiratory rate, and low oxygen saturation after evacuation suggest pulmonary edema or trophoblastic embolization, a breathing emergency. The nurse assesses this client first, raises the head of the bed, applies oxygen per protocol, and calls the provider or rapid response team. Option A describes expected findings after the procedure. Option C needs teaching, and hormonal contraception is considered safe during follow-up. Option D needs the dose given before discharge, but it is not time-critical in the next few minutes. Prep also explains why each wrong option looks reasonable.
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Frequently asked questions
What is the nursing diagnosis for hydatidiform mole?
The priority NANDA-I diagnosis is usually Risk for Bleeding, written with risk factors such as highly vascular molar tissue and planned uterine evacuation, and with no “as evidenced by.” Grieving, Anxiety, Nausea, and Inadequate Health Knowledge are common companion diagnoses.
What is the difference between a complete and a partial mole?
A complete mole has no fetal tissue and all of its chromosomes come from the father. A partial mole has an extra set of chromosomes and may contain abnormal fetal tissue. Complete moles usually have higher hCG levels, cause more classic symptoms, and carry a higher risk of persistent disease.
Why is hCG monitored after a molar pregnancy?
After the uterus is emptied, hCG should fall steadily to undetectable. A level that stops falling or rises is the main sign of gestational trophoblastic neoplasia, which is very treatable when found early. The provider sets the testing schedule, which depends on the type of mole.
Why should the client avoid pregnancy during follow-up?
A new pregnancy produces hCG, so a rising level could not be told apart from returning molar tissue. Reliable contraception is used until the provider says follow-up is complete. Hormonal methods are considered safe; an IUD is usually not placed until hCG is normal.
Is a molar pregnancy cancer?
A hydatidiform mole is not cancer, and most are cured by suction evacuation. In a minority of cases, molar tissue persists or becomes invasive (gestational trophoblastic neoplasia), and rarely it becomes choriocarcinoma. These conditions respond very well to chemotherapy when found early.
Can someone have a normal pregnancy after a molar pregnancy?
Yes. Most people go on to have normal pregnancies. The chance of another molar pregnancy is higher than average but still low, so an early ultrasound is recommended in the next pregnancy, and the provider may check hCG after that pregnancy ends.
References
- Herdman, T. H., Kamitsuru, S., & Lopes, C. T. (Eds.). NANDA International Nursing Diagnoses: Definitions and Classification, 2024–2026. Thieme.
- Ngan, H. Y. S., Seckl, M. J., Berkowitz, R. S., et al. Diagnosis and management of gestational trophoblastic disease: 2021 update. International Journal of Gynecology & Obstetrics, 2021;155(Suppl 1):86–93.
- Tidy, J., Seckl, M., & Hancock, B. W., on behalf of the Royal College of Obstetricians and Gynaecologists. Management of gestational trophoblastic disease (Green-top Guideline No. 38). BJOG, 2021;128(3):e1–e27.
- Soper, J. T. Gestational trophoblastic disease: current evaluation and management. Obstetrics & Gynecology, 2021;137(2):355–370.
- American College of Obstetricians and Gynecologists. Diagnosis and treatment of gestational trophoblastic disease (Practice Bulletin No. 53). Obstetrics & Gynecology, 2004;103(6):1365–1377.
- 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.
The hCG testing schedule and length of follow-up, contraception advice, Rh(D) immune globulin use, uterotonic and other medicine choices and doses, transfusion thresholds, vital sign frequency, and hemorrhage protocols vary by client, provider, facility, and country. Follow the provider’s orders and your own institution’s policies and protocols. This page supports study and does not replace course instruction or clinical judgment.
