Low Platelets: What It Means and What to Do Next
Low platelets, or thrombocytopenia, means you have fewer of the cell fragments that help your blood clot. Quest's adult range is 140–400 thousand per microliter, but go by the range printed on your report. A mildly low count is common and often has a simple cause: a recent viral infection, a medication, alcohol, pregnancy, or even platelets clumping in the tube, which makes the count read falsely low. Bleeding risk is usually low until the count falls below about 50 thousand. Easy bruising, tiny red spots on the skin or unusual bleeding with a low count should be checked promptly.
What Causes Low Platelet Count?
Clumping in the Tube (Pseudothrombocytopenia)
In some people, platelets clump together in the standard EDTA collection tube, so the machine undercounts them. The real count is normal. A repeat draw in a citrate tube or a blood smear confirms it.
Viral Infections
Mono, hepatitis C, HIV, COVID-19 and many other viruses can lower platelets, usually temporarily.
Immune Thrombocytopenia (ITP)
The immune system destroys platelets. In children it often follows a virus and resolves; in adults it is more often long-lasting. Other blood counts are usually normal.
Medications
Heparin, some antibiotics, quinine, anti-seizure drugs and chemotherapy can lower platelets. A drop after starting heparin needs urgent attention because it can cause clots.
Alcohol and Liver Disease
Heavy drinking suppresses platelet production, and an enlarged spleen from liver disease, including fatty liver and cirrhosis, traps platelets.
Pregnancy
A mild drop late in pregnancy (gestational thrombocytopenia) is common and harmless. Lower or rapidly falling counts can signal preeclampsia or HELLP syndrome and need prompt care.
B12 or Folate Deficiency
The marrow needs B12 and folate to make all blood cells, so deficiency can lower platelets along with red cells.
Autoimmune and Bone-Marrow Disorders
Lupus can lower platelets. Less often, leukemia, myelodysplastic syndrome or other marrow problems are the cause, usually with other abnormal counts.
Associated Symptoms
What to Do Next
1. Retest to confirm
A single abnormal result should be confirmed with a repeat test. Temporary factors like stress, illness, or medications can affect results.
2. Related tests to consider
3. When to see a doctor
If your Platelet Count is significantly abnormal, if you have severe symptoms, or if repeated results confirm the abnormality, consult a healthcare professional for appropriate evaluation and treatment.
Related Conditions
Frequently Asked Questions
This page is for informational purposes only and does not constitute medical advice. Consult a healthcare provider for interpretation of your results.
Content reviewed for accuracy by the JustLabs editorial team.