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Search our extensive Laboratory Test Directory to find test codes, ordering recommendations, specimen stability information, Test Fact Sheets, and more.

Changes and New Tests Explore the most recent updates to our Laboratory Test Directory in one convenient location. Review important information about upcoming or current Hotlines, CPT code changes, new tests, and immediate activations.

Test Resources Find general guidance on ARUP specimen preparation and handling, specimen transportation, test turnaround times, critical alerts, billing practices, patient forms, and more.

Changes and New Tests Explore the most recent updates to our Laboratory Test Directory in one convenient location. Review important information about upcoming or current Hotlines, CPT code changes, new tests, and immediate activations.

CPT Code Updates Find information about our annual and biweekly updates to CPT codes.

Test Resources Find general guidance on ARUP specimen preparation and handling, specimen transportation, test turnaround times, critical alerts, billing practices, patient forms, and more.

ARUP Consult^® Our clinical decision support resource, ARUP Consult, empowers clinicians with robust information, algorithms, and tools for informed patient care decisions.

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Lactic Acid, Body Fluid(Inactive as of 07/21/25)

0020504

Lactic Acid, Body Fluid(Inactive as of 07/21/25)

07-21-2025

CPT Codes

The American Medical Association Current Procedural Terminology (CPT) codes published in ARUP's Laboratory Test Directory are provided for informational purposes only. The codes reflect our interpretation of CPT coding requirements based upon AMA guidelines published annually.
CPT codes are provided only as guidance to assist clients with billing. ARUP strongly recommends that clients confirm CPT codes with their Medicare administrative contractor, as requirements may differ.
CPT coding is the sole responsibility of the billing party. ARUP Laboratories assumes no responsibility for billing errors due to reliance on the CPT codes published.

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