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Platelet Count and Morphology Evaluation (Manual Thrombocytopenia Screening)

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

This test measures the number and shape of platelets in your blood, which helps identify abnormalities like unusually large platelets.

Quick summary

["Platelets play a key role in blood clotting; this test helps assess bleeding risks or clotting disorders."]

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

Key facts at a glance

LOINC
32712-2
Short code
Giant Platelets Bld Manual-Rto
Synonyms
Giant Platelets Bld Manual-Rto
Category
hematology
Sample
whole-blood
Container
Lavender-top (EDTA)
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
manual-count
CPT
85049
SNOMED
900000000000003003
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like easy bruising, prolonged bleeding, or unexplained fatigue. It can also be part of routine blood checks or when investigating conditions like thrombocytopenia (low platelet count) or thrombocytosis (high platelet count).

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into your arm or hand to draw a blood sample. If you’re on blood thinners, let your provider know before the test to avoid unnecessary delays or complications.

What Happens During the Test

The blood sample is sent to a lab where technicians examine platelets under a microscope. Large platelets are counted and compared to typical sizes. This process is manual and doesn’t require advanced equipment beyond a microscope.

What the Results Mean

Results show whether your platelets are unusually large, which may indicate conditions like myeloproliferative disorders or certain cancers. While this test alone doesn’t diagnose a specific condition, it helps guide further testing if needed.

Reference range

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

Specimen: whole-blood

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Platelet Analysis

Frequently asked questions

What causes unusually large platelets?
Unusually large platelets can result from conditions like myeloproliferative disorders, infections, or certain medications. They may also appear as a reaction to stress, inflammation, or after blood transfusions. If you notice unusual bruising or bleeding, discuss these symptoms with your doctor.
How are large platelets treated?
Treatment depends on the underlying cause. If no specific disorder is found, your provider may monitor your platelets closely. In some cases, medications to manage blood clotting or reduce platelet production may be recommended. Avoiding certain medications or lifestyle changes (like smoking) can also help.
Can large platelets be managed at home?
While some lifestyle changes, like reducing stress or avoiding certain medications, may help, large platelets are typically managed with medical supervision. If you have symptoms like excessive bruising or bleeding, seek medical advice promptly to avoid complications.
  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