# Thrombocytopenia in Pregnancy

> Thrombocytopenia in pregnancy for NEET-PG Obstetrics and Gynaecology, comparing gestational thrombocytopenia, ITP and HELLP, with delivery thresholds.

- Canonical URL: https://prepelephant.com/topics/neet-pg/obstetrics-and-gynaecology/thrombocytopenia-in-pregnancy
- Exam / course: NEET-PG · Subject: Obstetrics and Gynaecology
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-08
- Last updated: 2026-10-08
- Reference basis: ACOG Practice Bulletin on Thrombocytopenia in Pregnancy; Williams Obstetrics; Dutta's Textbook of Obstetrics
- How to cite: "Thrombocytopenia in Pregnancy", PrepElephant, https://prepelephant.com/topics/neet-pg/obstetrics-and-gynaecology/thrombocytopenia-in-pregnancy

## Direct answer

Thrombocytopenia in pregnancy has four main causes that differ in severity and treatment: gestational thrombocytopenia, immune thrombocytopenia, HELLP syndrome and thrombotic thrombocytopenic purpura. Gestational thrombocytopenia is mild and harmless, while ITP, HELLP and TTP can threaten mother and fetus. The platelet count, blood film and haemolysis markers decide whether delivery or immunosuppression is needed.

## What you must remember

- **Gestational thrombocytopenia:** the commonest cause, usually mild with platelets above about 70 × 10^9/L, no bleeding, and resolution after delivery.
- **Immune thrombocytopenia:** autoimmune, with IgG antibodies crossing the placenta, so neonatal platelets may be low.
- **ITP treatment:** prednisolone is first line for significant thrombocytopenia, with intravenous immunoglobulin for bleeding or before delivery.
- **HELLP syndrome:** haemolysis, raised liver enzymes and low platelets, usually a pre-eclampsia spectrum disorder that needs delivery after stabilisation.
- **TTP:** microangiopathic haemolysis with schistocytes and severely reduced ADAMTS13 activity, requiring urgent plasma exchange.
- **Delivery thresholds:** neuraxial anaesthesia is generally given above about 70 × 10^9/L, and operative delivery usually needs a higher count than spontaneous delivery.
- **Other causes:** heparin-induced thrombocytopenia, dengue, malaria and HIV should be considered, especially in the Indian context.

## A comparison of the four causes

A 29-year-old at 37 weeks has a platelet count of 65 with normal blood pressure and no haemolysis. The same number can mean reassurance or an emergency, so the blood film, LDH and blood pressure must be read together before any decision about delivery.

| Condition | Typical clue | Action at term |
|---|---|---|
| Gestational | Count above about 70, normal smear | Routine monitoring and delivery |
| ITP | Isolated low count, petechiae, no haemolysis | Steroids, IVIG for bleeding or before delivery |
| HELLP | Raised LDH and liver enzymes, hypertension | Deliver after stabilisation |
| TTP | Schistocytes, neurological or renal features | Urgent plasma exchange |

Haemolysis and hypertension separate HELLP from ITP, while a schistocyte-rich smear points towards TTP. The count alone is never enough to decide the route of delivery.


Serial platelet counts matter more than a single value, because a falling trend in an otherwise well woman suggests a new process such as HELLP. The blood film is repeated whenever the count changes.

## Where the exam tries to catch you

Thrombocytopenia questions test whether the candidate treats the cause rather than the number.

- **Trap:** "Treat gestational thrombocytopenia with steroids." — **Correct:** it is benign and needs monitoring only, since steroids add no benefit and expose the mother to risk.
- **Trap:** "A platelet count under 100 always needs caesarean." — **Correct:** the route of delivery depends on the cause, the count trend, obstetric indications and anaesthetic needs.
- **Trap:** "Platelets of 60 mean ITP without checking the blood film." — **Correct:** the smear and LDH distinguish ITP from HELLP and TTP, which change the emergency plan.

## Frequently asked questions

### What platelet count suggests gestational thrombocytopenia rather than ITP?

Gestational thrombocytopenia usually gives a mild fall, with platelets commonly above about 70 × 10^9/L, no bleeding and a normal blood film, and it resolves after delivery. Immune thrombocytopenia tends to be more significant and may need steroids or immunoglobulin.

### When is platelet count relevant to neuraxial anaesthesia in pregnancy?

Neuraxial anaesthesia in thrombocytopenia is generally given when the platelet count is above about 70 × 10^9/L, because spinal haematoma is a concern at low counts. Thresholds vary between centres and depend on the cause and trend, so the anaesthetist should review each case.

### How is HELLP syndrome distinguished from immune thrombocytopenia?

HELLP syndrome shows haemolysis with raised LDH, raised liver enzymes and often hypertension, whereas immune thrombocytopenia is an isolated low platelet count without haemolysis. The blood film and LDH are therefore key tests, and HELLP calls for delivery after stabilisation.

### What treatment does immune thrombocytopenia in pregnancy need?

Immune thrombocytopenia in pregnancy is commonly treated first with prednisolone, with intravenous immunoglobulin for bleeding or before delivery when the count is low. The haematology team individualises treatment, and the neonatal team should be alerted to the risk of low platelets after birth.