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Platelet count (peripheral blood smear evaluation)

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

This test measures the number of platelets in your blood, which are essential for clotting. Low or high levels may indicate bleeding risks, clotting disorders, or other health concerns.

Quick summary

["Platelets help prevent excessive bleeding and support blood clotting—levels must stay within a healthy range."]

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

Key facts at a glance

LOINC
14300-8
Short code
Platpheresis Avail BPU
Synonyms
Platpheresis Avail BPU
Category
hematology
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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?

Your doctor may order a platelet count to diagnose or monitor conditions like anemia, bleeding disorders (e.g., hemophilia), infections, or reactions to medications. It’s also used before surgeries or procedures that could cause bleeding.

What to expect during the test?

A simple blood draw from a vein (usually in your arm) is needed. The process takes a few minutes, and you may feel slight discomfort. No special preparation is required.

Common reasons for abnormal results

Low platelet counts (thrombocytopenia) might suggest bone marrow issues, infections, or medications affecting platelet production. High counts (thrombocytosis) could signal chronic inflammation, cancer, or dehydration.

How results affect treatment

If your platelet count is low, your doctor may recommend blood transfusions, adjusting medications, or treating underlying conditions like autoimmune disorders. High counts may prompt lifestyle changes or further testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Platelet count check

Frequently asked questions

What does a platelet count tell me about my health?
It shows whether your blood has enough platelets to stop bleeding normally. Very low counts increase bleeding risk, while very high counts may raise clot formation risks.
Can I eat or drink before this test?
No special diet or fasting is needed. However, inform your doctor about any medications (especially blood thinners) or recent illnesses that might affect results.
How long will I wait for results?
Results are typically available within 1–3 business days, depending on lab processing times. Your doctor will discuss them with you.
  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