Red Blood Cell (RBC) Smear Examination (Qualitative)
A microscopic evaluation of your red blood cells (RBCs) to check their shape, size, and overall appearance. This test helps identify abnormalities that may signal conditions like anemia or other blood disorders.
["Assists doctors in diagnosing and managing blood-related health issues by examining RBC characteristics under a microscope."]
Key facts at a glance
- LOINC
- 30389-1
- Short code
- RBC # Semin plas
- Synonyms
- RBC # Semin plas
- Category
- chemistry
- Sample
- plasma
- Container
- Lavender-top (EDTA) or Green-top (Heparin)
- Units
- N/A
- Ref low
- 4.2
- Ref high
- 5.9
- Critical range
- 2 N/A – 7 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 85041
- SNOMED
- 900000000000003001
- 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
What Is a Red Blood Cell Smear Used For?
A red blood cell smear is primarily used to detect abnormalities in RBC morphology, such as anisocytosis (uneven size), poikilocytosis (irregular shape), or signs of hemolysis (destruction of RBCs). It can also help identify conditions like sickle cell anemia, thalassemia, or infections.
How Is the Test Performed?
A small sample of your blood is taken and spread thinly on a microscope slide. A healthcare professional then examines the smear under a microscope to evaluate the RBCs for any irregularities.
Preparation and Sample Collection
No special preparation is needed for this test. A simple blood draw from your arm is all that’s required. The sample is then processed and examined in the lab.
What Might Abnormal Findings Indicate?
Abnormalities in the RBC smear may suggest underlying health issues, such as nutritional deficiencies (e.g., iron or vitamin B12), chronic diseases, or genetic disorders. Your doctor will correlate these findings with your medical history and other tests to determine the cause.
Reference range
Adult males: 4.2-5.9; Females: 3.8-5.1 x 10^12/LN/A
No special preparation required. Stay well hydrated.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Red blood cell smears play a critical role in diagnosing and monitoring conditions affecting RBCs. They provide visual evidence of cellular changes that can guide treatment decisions, especially in cases where lab values alone may not be sufficient.
Short name
RBC Smear
Frequently asked questions
Why might my doctor order a red blood cell smear?
What are the common normal findings in a red blood cell smear?
How long does it take to get results from a red blood cell smear?
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 17, 2026. · Read our editorial policy