Platelet Morphology Examination via Peripheral Blood Smear (Qualitative Analysis)
This test examines the shape, size, and appearance of platelets (tiny blood cells that help prevent bleeding) under a microscope from a sample of your whole blood. It helps identify unusual platelet characteristics that may signal underlying conditions.
["A qualitative review of platelets can uncover subtle abnormalities that standard blood counts might miss."]
Key facts at a glance
- LOINC
- 5908-9
- Short code
- Giant Platelets Bld Ql Smear
- Synonyms
- Giant Platelets Bld Ql Smear
- 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
- microscopy-light
- 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 doctor may order this test if you have symptoms like easy bruising, unexplained bleeding, or unusual fatigue. It’s also used when platelet counts are normal but other signs of bleeding disorders persist. Sometimes, it’s part of a broader evaluation for conditions like thrombocytopenia (low platelet count) or giant platelet syndrome.
What to Expect Before the Test
No special preparation is needed. You’ll have a small needle inserted into your arm to draw a small amount of blood. The sample is then spread thinly on a microscope slide for detailed examination. The process takes about 10 minutes.
What Happens During the Test
After your blood is drawn, it’s sent to a lab where a trained technician examines the smear under a microscope. They look for variations in platelet size, shape, and number. Abnormalities might include unusually large platelets, clumps, or irregular forms.
Possible Results and Their Meaning
Results are qualitative (descriptive rather than numerical). Normal findings show typical platelet shapes and sizes. Abnormal results may indicate conditions like giant platelet syndrome, thrombocytopenia, or other bleeding disorders. Your doctor will discuss these findings with you.
Reference range
Adult: 150-400 x 10^9/LN/A
No special preparation required. Stay well hydrated.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Platelet morphology can reveal subtle but critical clues about bleeding risks or hidden platelet disorders. For example, giant platelets may suggest inherited conditions like Bernard-Soulier syndrome, while clumped or irregular platelets might point to acquired disorders like immune-mediated thrombocytopenia. Early detection can guide treatment decisions.
Short name
Platelet Smear Review
Frequently asked questions
How long does it take to get my results?
Can I eat or drink before this test?
What if I have a history of bleeding problems?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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