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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 are tiny cells that help prevent bleeding and promote clotting.

Quick summary

["Platelets help control bleeding and support blood clotting; low or high levels may indicate health concerns."]

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

Key facts at a glance

LOINC
40647-0
Short code
LA Nt Platelet PPP Ql
Synonyms
LA Nt Platelet PPP Ql
Category
hematology
Sample
plasma
Container
Lavender-top (EDTA) or Green-top (Heparin)
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
Method
coag
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 bleeding disorders, clotting issues, or conditions like anemia, leukemia, or infections. It’s also used before surgeries or procedures that could affect bleeding.

What to Expect During the Test

A simple blood draw from a vein (usually in your arm) is all that’s needed. The test is quick and painless, and you’ll likely feel minor discomfort for a few seconds.

Common Reasons for Abnormal Results

Low platelet counts (thrombocytopenia) may suggest bleeding disorders, certain medications, or conditions like autoimmune diseases. High platelet counts (thrombocytosis) could indicate infections, inflammation, or blood cancers.

Preparation for the Test

No special preparation is needed, but inform your doctor about any medications, especially blood thinners, or recent illnesses that might affect results.

Reference range

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

Specimen: plasma

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

How long does it take to get my platelet count results?
Results are typically available within 1–2 business days, depending on your lab. Your doctor will discuss them with you during your follow-up visit.
Can I eat or drink before this test?
You can eat and drink normally before the test, as it doesn’t require fasting. However, avoid alcohol or heavy meals 1–2 hours before your appointment if your doctor specifies it.
What if my platelet count is outside the normal range?
If your results are low, your doctor may recommend further tests or treatments, such as steroids, blood transfusions, or monitoring for underlying causes. High counts may also prompt additional evaluation to rule out infections or cancers.
  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