Red Blood Cell Morphology with Differential Count (Comprehensive)
This test examines the shape, size, and appearance of your red blood cells (RBCs) and counts different types of white blood cells (WBCs) to help identify potential blood disorders.
["Assessing your RBCs and WBCs can help detect conditions like anemia, infections, or blood abnormalities."]
Key facts at a glance
- LOINC
- 99864-1
- Short code
- Dysmorphic RBC # UrnS Comp Assist
- Synonyms
- Dysmorphic RBC # UrnS Comp Assist
- Category
- chemistry
- Sample
- urine
- Container
- Sterile urine container
- 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
- Method
- computer-assisted
- CPT
- 85041
- SNOMED
- 900000000000003001
- Specimen volume
- 10 mL
- Stability
- Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Doctors may order this test to diagnose or monitor conditions such as anemia (low RBCs), infections, blood disorders (like leukemia or sickle cell disease), or other blood-related issues. It can also help evaluate symptoms like fatigue, pale skin, or unusual bruising.
What to Expect Before the Test
No special preparation is needed. You may have a small needle inserted into your arm or hand to draw a small amount of blood. If you’re concerned about pain or discomfort, let your healthcare provider know.
What the Test Results Mean
Results include measurements of RBC shape (e.g., normocytic, microcytic, macrocytic), WBC counts (neutrophils, lymphocytes, etc.), and sometimes red cell indices. Abnormal findings may signal infections, genetic disorders, or other health concerns.
Common Conditions Detected
This test can help identify conditions like iron deficiency anemia (small, pale RBCs), pernicious anemia (large RBCs), or infections (elevated WBCs). It may also reveal signs of bone marrow disorders or blood clotting issues.
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.
Abnormal RBC morphology or WBC counts can indicate underlying health problems that require further medical evaluation. For example, irregular RBC shapes may point to hereditary conditions, while elevated or low WBC counts can signal infections or immune system disorders.
Short name
RBC Morphology & Diff
Frequently asked questions
What does an abnormal RBC morphology or differential count mean?
How often should I get this test?
Can I eat or drink before this test?
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