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Platelet Count (Peripheral Blood)

Published: August 9, 2026Updated: August 16, 2026

This test measures the number of platelets in your blood, which help prevent bleeding and promote clotting.

Quick summary

["Platelets are crucial for healthy blood clotting and preventing excessive bleeding."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
14301-6
Short code
Platelet Conc Avail BPU
Synonyms
Platelet Conc Avail BPU
Category
hematology
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
150
Ref high
400
Critical range
50 N/A – 1000 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
85049
SNOMED
900000000000003003
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Doctors may order a platelet count to check for conditions like low or high platelet levels, which can cause bleeding problems, easy bruising, or excessive clotting. It’s often used to monitor treatments for blood disorders or after surgeries or injuries.

What Does a Low or High Platelet Count Mean?

Very low platelet counts (thrombocytopenia) may lead to bleeding easily, frequent bruising, or nosebleeds. Very high counts (thrombocytosis) might increase the risk of blood clots. Your doctor will interpret results based on your symptoms and overall health.

How Is This Test Performed?

A small blood sample is taken from your arm, usually by a needle. The sample is sent to a lab where a machine automatically counts your platelets and other blood cells.

What Are Common Causes?

Platelet counts can drop due to medications, infections, autoimmune disorders, or conditions like leukemia. They may rise from stress, certain cancers, or infections like COVID-19.

Reference range

Adult: 150-400 x 10^9/LN/A

Specimen: serum

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Platelet Count

Frequently asked questions

What if My Platelet Count Is Abnormal?
If your platelet count is low, your doctor may recommend treatments like medications to boost production, blood transfusions, or managing underlying conditions. If high, they might suggest monitoring or treating the cause.
How Often Should I Get This Test?
Frequency depends on your health needs. Doctors may order it regularly if you have a blood disorder, take certain medications, or are recovering from surgery. Ask your doctor for personalized guidance.
Does This Test Have Any Risks?
The blood draw is generally safe but may cause mild discomfort or bruising. Rarely, there could be infection or allergic reactions to the needle. Most people tolerate it well.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy