Sedimentation rate, erythrocyte; automated
CPT4 code
Name of the Procedure:
Sedimentation Rate, Erythrocyte; Automated
Common name: ESR (Erythrocyte Sedimentation Rate)
Summary
The sedimentation rate, erythrocyte (ESR) test is a blood test that detects inflammation in the body by measuring how quickly red blood cells (erythrocytes) settle at the bottom of a test tube over a set period of time. An automated machine conducts the test to ensure accuracy and efficiency.
Purpose
The ESR test helps to diagnose and monitor conditions associated with acute and chronic inflammation, such as infections, cancers, and autoimmune diseases. Its goal is to provide a quick and non-invasive way to gauge inflammation levels in the body.
Indications
Common indications for an ESR test include:
- Unexplained fever
- Symptoms of inflammation (e.g., swelling, pain, redness)
- Suspected autoimmune diseases like lupus or rheumatoid arthritis
- Monitoring the progress of existing inflammatory diseases
Preparation
- There are no special preparations required for an ESR test.
- Patients can usually eat and drink normally beforehand.
- Inform the healthcare provider about any medications being taken, as some drugs can affect ESR results.
Procedure Description
- A blood sample is drawn from a vein in the arm, usually with the patient seated and the arm extended.
- The sample is stored in a specialized test tube.
- The blood sample is placed in an automated ESR analyzer, which measures how quickly the red blood cells fall to the bottom of the tube.
- The result is reported as the rate of fall in millimeters per hour (mm/hr).
The procedure does not require anesthesia or sedation.
Duration
The blood draw takes about 5-10 minutes. The actual sedimentation process in the analyzer typically takes an hour, but results might be available quicker due to the automated nature.
Setting
The ESR test can be performed in various settings, including:
- Hospital laboratories
- Outpatient clinics
- Diagnostic centers
Personnel
Professionals involved include:
- Phlebotomist or nurse to draw blood
- Laboratory technician or technologist to handle and analyze the sample
Risks and Complications
- Common risks are minimal and might include slight bruising or discomfort at the blood draw site.
- Rare complications could involve infection or excessive bleeding.
- Management includes standard post-phlebotomy care like applying pressure to the puncture site.
Benefits
- Non-invasive and quick.
- Provides valuable information about the presence and intensity of inflammation.
- Helps in diagnosing, managing, and monitoring various medical conditions.
Recovery
- Patients can return to normal activities immediately after the blood draw.
- No special post-procedure care is usually needed.
- Any minor discomfort at the puncture site typically resolves quickly.
Alternatives
- C-reactive Protein (CRP) test: another marker of inflammation, often used in conjunction with or as an alternative to ESR.
- Imaging studies or biopsies may be considered for more localized or specific investigations of inflammation.
- The choice depends on the clinical scenario and physician's judgment.
Patient Experience
- The patient may feel a quick pinch or stinging sensation during the blood draw.
- Temporary discomfort or bruising at the puncture site is possible.
- Pain management is generally unnecessary due to the minor nature of the procedure.