85652

Erythrocyte Sedimentation Rate (ESR); Automated

CPT code 85652 describes the automated determination of the erythrocyte sedimentation rate (ESR). The ESR is a common hematology laboratory test that measures the speed at which red blood cells (erythrocytes) settle at the bottom of a vertical tube of anticoagulated whole blood over a specific period, traditionally one hour. In the automated methodology (85652), advanced laboratory analyzers utilize optical, infrared, or digital sensors to monitor the sedimentation process, often providing results much faster than the manual Westergren method by extrapolating the hourly rate from a shorter observation window. The physiological principle behind the ESR relies on the fact that during inflammatory states, the body produces increased levels of acute-phase reactant proteins, such as fibrinogen and various globulins. These proteins carry positive charges that neutralize the negative 'zeta potential' normally found on the surface of erythrocytes. When this charge is neutralized, the cells aggregate into 'rouleaux' (stacks of red blood cells), which have a higher mass-to-surface-area ratio than individual cells and thus fall more rapidly through the plasma. Consequently, an elevated ESR is a non-specific indicator of systemic inflammation, infection, or tissue necrosis. While it is not diagnostic for a specific disease, it serves as a critical monitoring tool for chronic inflammatory conditions and can guide clinicians in determining the severity of an underlying process or the effectiveness of a therapeutic intervention. Automated ESR testing is preferred in high-volume laboratories due to its precision, reduced biohazard risk through closed-tube sampling, and faster turnaround times compared to manual 85651 methods.

Clinical Indications

  • Diagnosis and monitoring of Giant Cell Arteritis (Temporal Arteritis).
  • Screening for and monitoring of Polymyalgia Rheumatica (PMR).
  • Assessment of disease activity in Rheumatoid Arthritis (RA).
  • Monitoring systemic lupus erythematosus (SLE) and other collagen vascular diseases.
  • Evaluation of unexplained fever or 'fever of unknown origin' (FUO).
  • Monitoring response to therapy in patients with chronic infections such as osteomyelitis.
  • Detection of occult inflammatory processes in patients with vague symptoms like weight loss or fatigue.
  • Assessment of inflammatory bowel disease (IBD) activity, including Crohn's and Ulcerative Colitis.
  • Monitoring plasma cell dyscrasias, such as multiple myeloma.

Procedure Steps

  1. Whole blood is collected from the patient via venipuncture into a tube containing an anticoagulant (typically EDTA or 3.2% sodium citrate).
  2. The specimen is identified and verified to ensure it meets the laboratory's volume and stability requirements.
  3. The specimen tube is loaded into an automated ESR analyzer without opening the tube, maintaining a closed system for safety.
  4. The analyzer mixes the sample thoroughly to ensure even distribution of erythrocytes.
  5. The tube is placed in a vertical position, and infrared or optical sensors detect the position of the interface between the sedimenting red cells and the supernatant plasma.
  6. The automated system measures the distance of the fall over a timed interval (ranging from 15 to 30 minutes depending on the manufacturer).
  7. The software uses algorithms to extrapolate the measurement to the standard Westergren value of millimeters per hour (mm/hr).
  8. Results are electronically transmitted to the laboratory information system (LIS) for clinician review.

Coding Guidelines

  • CPT 85652 should be reported when an automated instrument is used to determine the sedimentation rate.
  • Do not report 85652 in conjunction with 85651 (Sedimentation rate, erythrocyte; non-automated) for the same specimen.
  • Verify the CLIA status of the specific automated instrument used; many automated ESR tests are classified as 'moderately complex' and require appropriate certification, though some are CLIA-waived.
  • If the ESR is part of a larger hematology profile that is not a standard CPT panel, each component should be billed individually.
  • Use appropriate ICD-10-CM codes to support medical necessity, focusing on the inflammatory symptoms or the specific disease being monitored.

Associated ICD-10 Codes