Late Pregnancy · Emergency
HELLP Syndrome — Symptoms & Emergency Care
HELLP = Haemolysis + Elevated Liver enzymes + Low Platelets. Severe variant of pre-eclampsia. Right rib pain + headache + feeling unwell ± high BP = HOSPITAL same day. Can occur in pregnancy OR up to 7 days postpartum. Delivery is the cure. Tennessee criteria + Mississippi classification.
Last reviewed 2 June 2026
HELLP syndrome classifier — Tennessee + Mississippi
Haemolysis · Elevated Liver enzymes · Low Platelets
U/L
mg/dL
U/L
/µL
Enter at least LDH (or bilirubin), AST, and platelets to classify.
Educational tool only — not medical advice. HELLP is a medical emergency. Maternal mortality 1-3 %, perinatal mortality 7-20 % depending on gestation. Definitive treatment is DELIVERY. Magnesium sulphate, BP control, transfusion support, and intensive monitoring are the bridges to delivery. Any suspicion of HELLP requires same-day obstetric input.
What does this mean?
HELLP (Hemolysis, Elevated Liver enzymes, Low Platelets) is a severe variant of pre-eclampsia complicating ~0.5 % of pregnancies and ~10–20 % of severe PE. ~30 % of cases occur postpartum, often within 48 h of delivery — that’s why right-upper-quadrant or epigastric pain, nausea, or headache in the first week after birth should never be brushed off. Maternal mortality is 1–3 % overall but rises with delays; perinatal mortality 7–20 %. Major complications: DIC, placental abruption, acute kidney injury, hepatic capsule haematoma/rupture, pulmonary oedema. Treatment is timely delivery + magnesium sulphate seizure prophylaxis + BP control (labetalol, hydralazine, nifedipine) + platelet/RBC support as needed. Some women with class 2/3 (less severe) HELLP < 34 wk can be stabilised for 24–48 h to complete steroids before delivery. Always over- rather than under-react to HELLP suspicion.
What is HELLP?
Severe complication of pre-eclampsia. Letters stand for blood-test findings:
- H = Haemolysis (red blood cells breaking down).
- EL = Elevated Liver enzymes.
- LP = Low Platelets.
Affects ~0.5-0.9% of pregnancies; 10-20% of severe PE develops HELLP. Maternal mortality 1-3%; baby mortality 7-20%.
Delivery is the treatment.
HELLP symptoms — when to call
Often dramatic:
- Severe pain under right rib or upper abdomen — most characteristic.
- Nausea + vomiting (especially if you haven’t been sick before).
- Headache paracetamol doesn’t shift.
- Visual changes — blurred vision, spots, flashing lights.
- Malaise / “flu-like” feeling.
- Jaundice (yellow skin/eyes) sometimes.
- Dark urine.
- Easy bleeding / bruising.
- High BP often present (but not always).
Pregnancy after 20 weeks + RUQ pain + feeling unwell = hospital same day.
Tennessee diagnostic criteria
- Haemolysis: fragmented RBC on smear, LDH ≥600 U/L, bilirubin ≥20.5 µmol/L.
- Elevated liver enzymes: AST or ALT ≥70 U/L.
- Low platelets: <100,000/µL.
All three = complete HELLP. Some = partial.
Mississippi classification (by platelets)
- Class 1: platelets <50,000 — severe.
- Class 2: 50-100,000 — moderate.
- Class 3: 100-150,000 — mild.
HELLP without high BP?
Yes — 15-20% of cases. Makes diagnosis harder. Prominent features then: RUQ pain, nausea/vomiting, malaise, headache. Blood tests clarify.
Postpartum HELLP
Up to 7 days after birth. ~30% of cases present postpartum. Symptoms same. Severe RUQ pain + new headache + feeling unwell in days after birth = red flag.
Often missed because attention shifts to baby. Make a noise if you feel wrong.
Treatment
- Delivery — only definitive cure.
- Magnesium sulphate — prevent seizures (eclampsia).
- BP control if raised — labetalol, hydralazine, nifedipine.
- Blood products if needed (platelets, FFP, red cells).
- ICU / HDU monitoring.
- Steroids for baby lung maturity if <34 weeks.
Delivery method
Often C-section depending on gestation, cervix, urgency. Spinal / epidural not possible if platelets <70-80,000 (spinal haematoma risk). General anaesthesia often needed in severe HELLP.
Recovery
Usually rapid — HELLP resolves within 48-72 hours of delivery. LDH normalises within days; platelets 2-3 days; liver enzymes 1-2 weeks.
Emotional recovery: trauma common. PTSD support important.
Next pregnancy
Recurrence risk: 19-27% HELLP; 50-70% PE.
Preconception:
- HbA1c, BP, BMI optimisation.
- APS antibody screen.
- Aspirin 150 mg from <16 weeks next pregnancy.
- Calcium supplementation if low intake.
- Specialist consultant care from booking.
- Intensive monitoring: weekly BP, urine, bloods 28+ wk, growth scans.
Different scenarios — HELLP
Scenario 1: 32 weeks, RUQ pain + headache + BP 160/110
Emergency: hospital now. Bloods. Magnesium sulphate. BP control. Steroids for baby. Plan delivery within 24-48 hours.
Scenario 2: 36 weeks, mild HELLP, BP 145/95
Admission. Steroids if not given. Stabilise. Deliver within 48 hours, vaginal or C-section depending on cervix.
Scenario 3: Day 4 postpartum, severe headache + RUQ pain
Possible postpartum HELLP. A&E. Bloods. Magnesium sulphate. BP control. Recovery monitoring.
Scenario 4: Previous HELLP at 28 weeks, planning second pregnancy
Preconception consultant. Aspirin from 12 wk. Specialist clinic. Weekly BP and urine from 20 wk. Growth scans. Intensive plan.
Scenario 5: 24-week HELLP, baby unlikely to survive at this gestation
Difficult discussion. Delivery vs awaiting deterioration vs termination of pregnancy depending on maternal severity. Specialist ethics + obstetric input. Family support.
Care guidance — HELLP
- Severe RUQ pain in pregnancy / postpartum = bloods.
- Don’t dismiss symptoms.
- Tennessee criteria = diagnostic.
- Postpartum window = 7 days.
- Delivery is cure.
- Magnesium sulphate for seizure prevention.
- Steroids if <34 weeks.
- ICU / HDU for severe.
- Recovery usually rapid post-delivery.
- Next pregnancy: aspirin + specialist care.
- Mental health: PTSD support.
- Long-term: cardiovascular follow-up.
Sources
- RCOG Green-top Guideline 10A. The management of severe pre-eclampsia / eclampsia.
- Weinstein L. Syndrome of hemolysis, elevated liver enzymes, and low platelet count: a severe consequence of hypertension in pregnancy. AJOG 1982.
- NICE NG133. Hypertension in pregnancy: diagnosis and management.
- Action on Pre-eclampsia (APEC) UK. action-on-pre-eclampsia.org.uk.
- Preeclampsia Foundation. preeclampsia.org.
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Frequently asked questions
What is HELLP syndrome?
HELLP is a SEVERE COMPLICATION of pre-eclampsia. The letters stand for what's affected in blood tests: H = HAEMOLYSIS (red blood cells breaking down); EL = ELEVATED LIVER ENZYMES; LP = LOW PLATELETS (clotting cells). AFFECTS ~0.5-0.9% of all pregnancies; 10-20% of women with severe pre-eclampsia develop HELLP. EMERGENCY — needs immediate hospital care. MATERNAL mortality 1-3%; baby mortality 7-20% (mostly due to need for early delivery). DELIVERY IS THE TREATMENT — at any gestation if HELLP confirmed. First described Weinstein 1982.
What are HELLP symptoms?
OFTEN DRAMATIC. (1) SEVERE PAIN under right rib cage (your liver) or upper abdomen — most characteristic; (2) NAUSEA + VOMITING (especially if you haven't been sick before); (3) HEADACHE that paracetamol doesn't shift; (4) VISUAL changes — blurred vision, spots, flashing lights; (5) MALAISE / 'flu-like' feeling; (6) JAUNDICE (yellow skin/eyes) sometimes; (7) DARK URINE; (8) BLEEDING / bruising more easily; (9) HIGH BLOOD PRESSURE often present (but not always). ANY pregnancy after 20 weeks + RUQ pain + feeling unwell = HOSPITAL same day.
How is HELLP diagnosed?
BLOOD TESTS — TENNESSEE CRITERIA: (1) HAEMOLYSIS — peripheral blood smear shows fragmented red cells, LDH ≥600 U/L, total bilirubin ≥20.5 µmol/L (1.2 mg/dL); (2) ELEVATED LIVER ENZYMES — AST or ALT ≥70 U/L; (3) LOW PLATELETS — <100,000/µL. ALL THREE = COMPLETE HELLP; SOME = PARTIAL. MISSISSIPPI CLASSIFICATION grades severity by platelet count: Class 1 (<50,000) severe; Class 2 (50-100,000) moderate; Class 3 (100-150,000) mild. URINE PROTEIN often raised (preeclampsia overlap). BP often raised but can be normal in 15-20% of HELLP.
Can HELLP happen without high blood pressure?
YES — 15-20% of HELLP cases. ATYPICAL HELLP. MAKES DIAGNOSIS HARDER — easy to miss if you're not hypertensive. PROMINENT presenting features: RIGHT UPPER QUADRANT PAIN; NAUSEA + VOMITING; MALAISE; HEADACHE. WHY: BP may rise later or stay relatively normal while liver + platelets are affected. CLINICIAN must consider HELLP in any pregnant woman (or up to 7 days postpartum) with these symptoms even with normal BP. BLOOD TESTS clarify.
Can HELLP happen after delivery?
YES — up to 7 DAYS POSTPARTUM. ~30% of HELLP cases present postpartum (in women without preceding PE diagnosis). SYMPTOMS same: RUQ pain, nausea, headache, feeling unwell. POSTNATAL contact: midwife, GP, A&E. RED FLAG combination: severe RUQ pain + new headache + feeling 'unwell' in days after birth. EVEN IF you had normal BP throughout pregnancy and birth. POSTPARTUM HELLP often missed because attention shifts to baby; mum's symptoms minimised. MAKE A NOISE if you feel wrong.
What treatment do I need?
URGENT HOSPITAL admission. TREATMENT: (1) DELIVERY of baby — only definitive cure; immediate if >34 weeks; 24-48 hours of steroids + delivery if 24-34 weeks; rare delays. (2) MAGNESIUM SULPHATE infusion — prevent seizures (eclampsia); IV bolus + maintenance. (3) BP control if raised — labetalol, hydralazine, nifedipine. (4) BLOOD PRODUCTS if needed — platelets (if <50,000 + bleeding); FFP if coagulopathy; red cells if haemolysing. (5) ICU / HDU monitoring. (6) STEROIDS — controversial for HELLP treatment per se; useful for baby's lung maturity if <34 weeks. POST-DELIVERY: usually rapid recovery; monitoring ongoing.
Will I need a C-section?
OFTEN YES — depends on gestation, cervix, urgency. IF unstable / fetal distress / severe maternal: emergency C-section. IF stable + favourable cervix at term: induction possible. AT 24-34 weeks: usually C-section if delivery needed quickly (induction takes hours-days). C-section RISKS in HELLP: low platelets = bleeding risk; spinal/epidural NOT possible if platelets <70-80,000 (spinal haematoma); GENERAL ANAESTHESIA often needed in severe HELLP. SOME women have planned C-section if recurrence anticipated. EVERY CASE individualised.
Will my baby be okay?
DEPENDS ON GESTATION + how quickly diagnosed. PRETERM is the biggest risk for baby — many HELLP babies delivered 26-34 weeks need NICU. STATISTICS: baby mortality 7-20% across all gestations; <26 weeks much higher; 34+ weeks much better. NEONATAL TEAM AT BIRTH for early observation, breathing support, hypoglycaemia checks. ANTENATAL STEROIDS very protective for lungs + brain bleeds if delivery <34 weeks. MAGNESIUM SULPHATE (for mum's seizure prevention) also neuroprotective for baby. POSITIVE: most modern NICUs achieve excellent outcomes for 28+ weeks.
Will HELLP come back next pregnancy?
RECURRENCE risk 19-27% for HELLP; 50-70% for pre-eclampsia. HIGHER if: HELLP <28 weeks (severe early-onset); multiple PE pregnancies; underlying autoimmune (APS, lupus). PRECONCEPTION CARE: HbA1c, BP, BMI optimisation; APS antibodies if suspected; ASPIRIN 150 mg from <16 weeks next pregnancy; CALCIUM 1.5-2 g/day if low dietary intake; specialist consultant care from booking. INTENSIVE monitoring next pregnancy: BP weekly, urine dipsticks, bloods 28+ weeks, growth scans. MOST women have safer next pregnancy with proactive management.
What's the recovery like after HELLP?
USUALLY RAPID — most HELLP resolves within 48-72 hours of delivery. LDH normalises within days; platelets recover 2-3 days; liver enzymes return to normal 1-2 weeks. SOME women have prolonged recovery; rare PROGRESSION to multi-organ failure / DIC needing ICU. PHYSICAL recovery: usual postpartum + fatigue from severe illness; possible need for ongoing BP medication 1-3 months. EMOTIONAL recovery: trauma processing important; PTSD common after severe HELLP / preterm delivery / NICU stay; mental health support essential. NEXT PREGNANCY: emotional preparation, debrief with consultant, psychological support.
What's the long-term impact for me?
CARDIOVASCULAR RISK: HELLP increases LIFETIME risk of: high BP (~50%), heart disease (~2x), stroke (~2x), kidney disease, T2DM. PREVENTIVE: annual BP check; HbA1c, lipids, BMI optimisation; lifestyle measures. LIVER: usually fully recovers; no chronic liver disease. KIDNEY: usually recovers; rare lasting damage. CARDIAC: usually no lasting damage; rare cardiomyopathy. PSYCHOLOGICAL: PTSD common after severe HELLP — treatment available.
Why does HELLP happen?
PATHOPHYSIOLOGY: ABNORMAL PLACENTAL DEVELOPMENT (similar to pre-eclampsia) → cytokine release, endothelial damage → microvascular blood vessel changes → red blood cell breakdown (haemolysis), liver microthrombi (enzyme rise), platelet consumption (low platelets). RISK FACTORS for PE / HELLP: (1) FIRST pregnancy; (2) Previous PE / HELLP; (3) BMI ≥30; (4) Age 35+ or under 20; (5) Multiple pregnancy; (6) Chronic hypertension; (7) Diabetes; (8) Kidney disease; (9) Autoimmune (APS, lupus); (10) Family history. PREVENTION: ASPIRIN 150 mg from <16 weeks for high-risk women.
Can I prevent HELLP next pregnancy?
REDUCE RISK: (1) ASPIRIN 150 mg nightly from <16 weeks — strong evidence reduces PE/HELLP risk; (2) CALCIUM supplementation if low intake; (3) LIFESTYLE — BMI optimisation, BP control pre-pregnancy; (4) APS / underlying condition screen if not done; (5) MULTIDISCIPLINARY antenatal care; (6) INTENSIVE monitoring throughout pregnancy. SOME EXPERIMENTAL: low molecular weight heparin (LMWH) for selected cases. AVOID: missed antenatal appointments, stress (where possible), high salt intake. NOT ALL HELLP PREVENTABLE but risk can be substantially reduced.
What support is available?
(1) MIDWIFE / OBSTETRICIAN; (2) ACTION ON PRE-ECLAMPSIA (APEC) UK — charity; (3) PRE-ECLAMPSIA FOUNDATION (US); (4) BIRTH TRAUMA ASSOCIATION; (5) PERINATAL MENTAL HEALTH team for PTSD; (6) PEER SUPPORT — other HELLP / PE mums on social media; (7) ICP / liver support if liver-prominent variant; (8) GENERAL pregnancy charities (Tommy's, NCT). NEXT PREGNANCY: preconception consultation with consultant; specialist clinic.
How does this relate to other calculators on BumpBites?
Companion: /calculators/preeclampsia-risk for PE risk; /calculators/preeclampsia-diagnosis for diagnosis; /calculators/aspirin-pe-prevention for prevention; /calculators/icp-cholestasis (liver overlap); /calculators/magnesium-sulphate for seizure prevention; /calculators/antenatal-steroids for baby lung maturity; /calculators/hypertensive-emergency-pregnancy.