Red Blood Cell Platelet Ratio (RBC:Platelet Ratio)
This test compares the number of red blood cells to platelets in your blood, which can help identify certain blood disorders or conditions.
["Understanding your RBC-to-platelet balance may help diagnose or monitor blood-related health issues."]
Key facts at a glance
- LOINC
- 26456-4
- Short code
- RBC # Plr
- Synonyms
- RBC # Plr
- Category
- chemistry
- Sample
- fluid
- Container
- Sterile tube
- 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
- 2-5 mL
- Stability
- Room temperature: 2h, Refrigerated: 24h
- Hemolysis max
- 300
- TAT
- 4–24 hours
- Order
- routine
What Is the RBC:Platelet Ratio Test Used For?
Doctors may order this test to evaluate conditions affecting red blood cells or platelets, such as anemia, thrombocytopenia, or blood clotting disorders. It can also assist in diagnosing or monitoring diseases like leukemia, autoimmune disorders, or infections.
How Is This Test Performed?
A small blood sample is drawn from a vein, typically in your arm. The sample is then analyzed in a lab to measure both red blood cell and platelet counts. No special preparation is needed, but fasting may be advised depending on other tests ordered with it.
What Might Abnormal Results Indicate?
A higher RBC:Platelet ratio might suggest conditions like polycythemia (too many red blood cells) or certain infections. A lower ratio could indicate thrombocytopenia (low platelet count) or conditions like autoimmune disorders. Always discuss results with your healthcare provider.
Common Conditions Monitored With This Test
This test is often used alongside other blood tests to monitor chronic conditions like myeloproliferative disorders, leukemia, or to assess responses to treatments for blood disorders.
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.
◆Associated findings1
Short name
RBC:Platelet Ratio
Frequently asked questions
Why might my doctor ask for this test?
What are typical reference ranges for this test?
Do I need to prepare for 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