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UW Health SMPH
American Family Children's Hospital

UW Hospital and Clinics Lab Test Directory

Test Name: ESR

Test Code(s): WEST / ESR

CPT Code(s): 85652

Methodology: Modified Westergren Method

Clinical Significance: Recommended for rheumatology patients.

Days Performed: Daily, 24 hours.

Turnaround Time: Stat: 1 hour.
Routine: 2 hours.

Specimen Requirements

Specimen: Blood

Collection Instructions: A lavender top tube must be drawn just for Erythrocyte Sedimentation Rate (ESR) testing.  If additional work on a lavender top tube is needed, a separate tube must be drawn.

Collection Container: Preferred: Lavender top
Also Acceptable: Excyte ESR Vacuum container

Collection Volume: Preferred: 4 mL
Pediatrics: 2 mL

Sample Analyzed: Whole Blood

Volume Required: Preferred: 1.5 mL
Pediatrics: 1.3 mL

Specimen Transport: Transport specimen to UWHC Core Laboratory (B4/220) within 4 hours of collection if at room temperature or with coolant pack if within 12 hours; avoid freezing.

Stability: Ambient: 4 hours
Refrigerated: 12 hours
Frozen: Not acceptable


Reference Interval:
 Age  mm/hr
 Male: 0 days and up  0 - 15
 Female: 0 days and up  0 - 20


ESR Sedimentation Rate, Westergren
Erythrocyte Sedimentation Rate

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