Anemia, Iron & Blood Health

Low Platelets in Pregnancy: Gestational Thrombocytopenia, ITP and More

By the Find Her Doctor editorial team · Updated November 1, 2026 · 5 min read

Low platelets in pregnancy (thrombocytopenia) means a platelet count below 150,000 per microliter. It's common, and by far the most frequent cause is gestational thrombocytopenia, a mild, harmless dip that goes away after birth. Less often, low platelets point to immune thrombocytopenia (ITP) or preeclampsia, which need closer care.

Most people find out the same way: a routine blood test comes back with a number flagged in red, and the portal message just says "platelets slightly low, will recheck." Here's how to read that result, and what your team is looking for.

First, what platelets do

Platelets are tiny blood cells that help your blood clot. When a vessel is injured, they clump together to plug the leak. A normal count is roughly 150,000 to 450,000 per microliter of blood. Lab reports often write this as 150 to 450 (in thousands), so "132" on your result means 132,000.

Counts often drift down during a healthy pregnancy, partly because blood volume expands and partly because platelets get used up a little faster.

Reading your result: the questions that matter

Your team usually works through these:

1. Is the number real? Platelets can clump in the tube and give a falsely low reading. A repeat test, sometimes with a blood smear, sorts this out. This is surprisingly common.
2. When did it show up? A mild drop in the second or third trimester points toward gestational thrombocytopenia. Low counts before pregnancy or in the first trimester point toward ITP.
3. How low is it? Counts below about 100,000 are uncommon with gestational thrombocytopenia and get a closer look.
4. What's your blood pressure doing? Low platelets plus high blood pressure raises concern for preeclampsia or HELLP.
5. Any bleeding symptoms? Bruising, tiny red dots, nosebleeds or bleeding gums matter.

The causes, side by side

Gestational thrombocytopenia

ACOG describes it as the most common cause of low platelets in pregnancy. Typical features:

• A mild drop
• Shows up in the second or third trimester
• No history of low platelets outside pregnancy
• No bleeding symptoms
• Doesn't cause low platelets in the baby
• Platelets return to normal, usually within 1 to 2 months after birth

It's a diagnosis made after other causes have been considered, and it needs no treatment. In practice, it mostly means a few extra blood draws and a check before labor.

Immune thrombocytopenia (ITP)

In ITP, the immune system makes antibodies that destroy platelets. Clues that point to ITP:

• Low platelets before pregnancy or in the first trimester
• Lower counts, especially below about 100,000
• Easy bruising, nosebleeds or bleeding gums

Many people with ITP have uncomplicated pregnancies. Treatment, when needed, often includes steroids or IV immune globulin (IVIG). ITP antibodies can cross the placenta, so the baby's platelet count is usually checked after birth. If you already have ITP, share your past treatments and lowest counts with your OB team at the first visit.

Preeclampsia and HELLP syndrome

Preeclampsia is a high blood pressure disorder of pregnancy. HELLP is a severe form involving Hemolysis (red blood cells breaking down), Elevated Liver enzymes and Low Platelets. Both need urgent care.

Symptoms to watch for

Most people with gestational thrombocytopenia feel nothing. With lower counts, you might notice:

• Easy or unexplained bruising
• Tiny red or purple dots on the skin (petechiae), often on the lower legs
• Nosebleeds or bleeding gums when you brush (some gum bleeding is common in pregnancy anyway, so mention it rather than worry)
• Blood in urine or stool

Warning signs of preeclampsia or HELLP

Call your provider right away or go to labor and delivery if you have:

• A severe headache that doesn't go away
• Vision changes, like blurriness or seeing spots
• Pain in the upper right belly or under the ribs
• Nausea or vomiting in the second half of pregnancy
• Sudden swelling of the face or hands
• Shortness of breath

The big question: can I still get an epidural?

This is what most people want to know, and the honest answer is: usually yes, if the drop is mild. The anesthesia team decides based on your latest count, how fast it's changing, and the cause. That's why counts are checked near delivery. If your platelets are on the low side, ask whether you should meet with anesthesia before your due date, so the plan is set before you're in labor at 3 a.m.

Delivery method

Low platelets alone usually don't change whether you have a vaginal or cesarean birth. Your team will plan to reduce bleeding risk at delivery.

Your baby

Babies of mothers with gestational thrombocytopenia almost never have low platelets. With ITP, the baby's count may be checked after birth.

Questions to ask your provider

• What's my platelet count, and how has it changed over the pregnancy?
• What do you think is the most likely cause?
• Do I need more blood tests or a hematology referral?
• How often will my platelets be checked?
• Will my count affect my ability to get an epidural?
• Should I meet with anesthesia before my due date?
• Will my baby's platelets need checking after birth?
• Could any of my medicines or supplements be affecting my platelets?

Will it happen again next time?

Gestational thrombocytopenia can recur in a later pregnancy, so let your next prenatal team know. ITP is a longer-term condition, so platelets are usually monitored before and during any future pregnancy.

When to call your provider

Call your OB/GYN or midwife if you:

• Notice new bruising, petechiae, nosebleeds or bleeding gums
• Have been told your platelets are low and want to understand why
• Have a history of ITP and are pregnant or planning a pregnancy

Get urgent care for heavy bleeding, a severe headache, vision changes or upper belly pain.

If you have ITP or significantly low platelets, a maternal-fetal medicine specialist may co-manage your care. In New York, people with more complex pregnancies are often cared for at or near a Regional Perinatal Center, the hospitals the state designates for the highest-risk mothers and babies. You can also search for an OB/GYN near you. For related blood conditions, see anemia in pregnancy.

Seeing a hematologist in New York

A hematologist may be involved if your count is lower than expected for gestational thrombocytopenia, if ITP or another blood disorder is suspected, or if treatment is needed before delivery. Premier Hematology & Oncology, which sponsors our professional resources, offers hematology consults at centers across NYC, Long Island and the Hudson Valley. Clinicians can find referral information on our hematology partners page.

Frequently asked questions

Sources

• ACOG — Practice Bulletin 207: Thrombocytopenia in Pregnancy
• ACOG — Practice Bulletin 222: Gestational Hypertension and Preeclampsia
• American Society of Hematology — 2019 Guidelines for Immune Thrombocytopenia
• NHLBI — Thrombocytopenia

This article is for general education and is not medical advice. It does not replace an evaluation by a licensed clinician who knows your history. If you think you have a medical emergency, call 911.