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To view specimen requirements and codes please select your laboratory:

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Sed Rate by Modified Westergren

Test Code


CPT Code(s)


Preferred Specimen(s)

Whole blood:  Full EDTA (lavender-top) tube

Minimum Volume

2 mL

Collection Instructions

Maintain specimen at room temperature. If multiple tests are ordered, please submit a separate tube for this test.

Transport Container

EDTA (lavender-top) tube

Transport Temperature

Room temperature

Specimen Stability

Room temperature: 24 hours
Refrigerated: 24 hours

Reject Criteria

Hemolysis • Samples >24 hours old • Clotted


Modified Westergren

Performing Laboratory

Quest Diagnostics-Cincinnati
6700 Steger Drive
Cincinnati, OH 45237-3046

Setup Schedule

Set up: Mon-Sun continuous; Report available: 1 day


Patients with polycythemia and many hemoglobin abnormalities may have depressed sed rates whereas patients with anemia may have elevated sed rates.

Reference Range(s)

  Male Female
≤50 Years    ≤15 mm/h     ≤20 mm/h
>50 Years ≤20 mm/h ≤30 mm/h

Clinical Significance

Useful in differentiating inflammatory and neoplastic diseases and as an index of disease severity. CRP is also useful in monitoring inflammatory disease states.

Alternative Name(s)


LOINC®' Code(s)

The Result and LOINC information listed below should not be used for electronic interface maintenance with Quest Diagnostics. Please contact the Quest Diagnostics Connectivity Help Desk for more information at 800-697-9302.

NOTE: The codes listed in the table below are not orderable Test Codes.

Result NameLOINC CodeComponent Name
30045300SED RATE BY MODIFIED WESTERGREN4537-7Erythrocyte sedimentation rate

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.