ESR (Sed Rate)
Measures inflammation levels by testing how quickly red blood cells settle in a tube over one hour.
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What this test measures
The ESR test is a quick, simple blood test that can show if inflammation is present in the body. The test measures the rate at which red blood cells (erythrocytes) settle to the bottom of a vertical container over one hour. When inflammatory conditions are present, proteins in the blood increase, causing red blood cells to clump together and settle more rapidly.
ESR is nonspecific and not diagnostic for any particular disease, but serves as a useful marker of systemic inflammation that can occur in conditions including acute and chronic infections, autoimmune diseases, malignancies, and tissue injury. Trends in ESR often correlate with disease progression, with increasing levels suggesting worsening inflammation and declining values potentially indicating therapeutic response or disease remission. The test is particularly helpful for monitoring chronic inflammatory conditions over time and may be used alongside other tests to provide a more complete picture of health status.
Who should consider this test
You might consider this test if you are experiencing any of the following:
- Individuals experiencing unexplained fatigue, fever, joint pain, or muscle aches that may suggest inflammatory conditions
- Those with known autoimmune disorders like rheumatoid arthritis, lupus, or inflammatory bowel disease who need monitoring
- Patients suspected of having infections, particularly when other symptoms are present but the cause is unclear
- Individuals being evaluated for conditions like temporal arteritis, polymyalgia rheumatica, or other inflammatory disorders
- Those undergoing treatment for inflammatory conditions who need to track response to therapy over time
What to expect
Preparation
No special preparation is needed for an ESR test - individuals can eat, drink fluids and take usual medications and supplements. Certain factors like pregnancy, menstrual cycle, medications, and recent fatty meals may affect results, so inform your healthcare provider about any relevant circumstances.
Sample Type
A small amount of blood is drawn from a vein, usually in the arm, using a needle inserted into the vein. The blood collection process typically takes less than five minutes.
Collection
A healthcare provider or phlebotomist will clean the area with antiseptic and insert a needle into the vein to collect the blood sample. Individuals may feel a slight sting when the needle goes in or out.
Turnaround
Results are typically available within 24-48 hours after the sample is collected at the laboratory.
Understanding your results
ESR is measured in millimeters per hour (mm/hr). The test cannot confirm or rule out specific diseases but shows whether inflammation is present in the body, which healthcare providers use along with other tests, physical exams, and symptoms to reach a diagnosis. Results must be interpreted in context with clinical symptoms and other laboratory findings.
| Population | Reference Range | Notes |
|---|---|---|
| Men under 50 | 0-15 mm/hr | Normal range for adult males under 50 years of age |
| Women under 50 | 0-20 mm/hr | Normal range for adult females under 50 years of age |
| Men over 50 | 0-20 mm/hr | Slightly higher normal range for older adult males |
| Women over 50 | 0-30 mm/hr | Higher normal range for older adult females |
Reference ranges shown are general guidelines. Your lab report will include the specific reference range used by the laboratory that processed your sample, which is the authoritative range for interpreting your results.
What does a “Low” result mean?
Decreased ESR may occur in conditions like polycythemia, hyperviscosity, sickle cell anemia, leukemia, chronic fatigue syndrome, or low plasma protein due to liver or kidney disease. High blood viscosity and increased red blood cell count can slow the settling rate. Certain blood disorders like sickle-cell disease can result in low ESR due to improper red blood cell shape that impairs normal stacking. While low ESR is less commonly a cause for concern, it may occasionally indicate underlying blood disorders that affect red blood cell characteristics.
What does a “High” result mean?
Elevated ESR levels may suggest increased inflammatory activity and can occur in conditions including acute and chronic infections, autoimmune diseases such as connective tissue disorders, malignancies, and tissue injury or necrosis. ESR values exceeding 100 mm/hr carry a 90% probability of serious underlying disease and warrant urgent medical evaluation. Mildly elevated ESR may also result from non-disease factors like anemia, pregnancy, obesity, menstruation, or recent minor illness. Healthcare providers typically consider clinical symptoms and order additional tests to determine the underlying cause of elevated results.
Privacy & confidentiality
All test orders are authorized and results reviewed by an independent, board-certified physician who is not the patient's personal doctor. Your ESR test results are handled with complete confidentiality and privacy protection. All test results are <u>not reported to your doctor</u> unless you specifically choose to share them, giving you full control over your health information. The results are <u>not part of your medical records</u> and won't appear in any medical databases or insurance systems. Additionally, ESR test results are <u>not on insurance statements</u> or explanation of benefits forms, ensuring your privacy is maintained. LevelPanel maintains strict data security protocols and never shares your personal health information with employers, insurance companies, or third parties without your explicit consent. You can access your results through a secure online portal, and no doctor visit is required to order this test. This confidential testing approach allows individuals to monitor their inflammation levels privately and make informed decisions about their health without external pressures or concerns about insurance implications.
Frequently asked questions
Related tests
C-Reactive Protein (CRP)
$49Often ordered together with ESR as CRP responds more quickly to acute inflammation and provides complementary information
View TestComplete Blood Count (CBC)
$29Helps evaluate for anemia and other blood conditions that can affect ESR results
View TestRheumatoid Factor (RF)
$39Used to help diagnose rheumatoid arthritis and other autoimmune conditions when ESR is elevated
View TestRelated conditions
CPT Code: 85652
This test may not be available in: NY, NJ, RI
This page is for informational purposes only and does not constitute medical advice. Always consult with a healthcare provider regarding any health concerns. LevelPanel does not diagnose, treat, or prescribe.
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Not sure if this is the right test? Contact our care team for guidance.