Skip to main content

News
Careers
Contact Us
|
Connect Sign In

- News
- Careers
- Contact Us
Testing

Test Directory

Test Updates

Clinical Decision Support | ARUP Consult^®

Resources

Featured Test Categories

Search Our Test Directory

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.

Performed/Reported Find information about updates to the Performed schedule and the Reported turnaround time.

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

Choose the Right Test

Testing Algorithms

Test Fact Sheets

Test Resources Find specimen instructions, test turnaround times, patient forms, test codes, and more.

Specimen Handling

CPT Codes

Z-Codes

LOINC Codes

Test Turnaround Time and Contingency Plan

Critical Values and Urgent Notifications

View All Test Resources

Comprehensive Diagnostic Solutions Discover the benefits of our testing for each featured test category. Explore highlighted updates, articles, video spotlights, and more.

This section highlights our specialized offerings and is separate from our Laboratory Test Directory.

Autoimmune Neurologic Disease

Genetics

Hematopathology

Infectious Disease

View All

Search the Laboratory Test Directory

Clinical Decision Support | ARUP Consult^®
Services

Healthcare Advisory Services

Drug and Clinical Research Services

Research and Innovation

Tailored Solutions and Advisory Services Optimize your laboratory by partnering with ARUP Healthcare Advisory Services. Discover our solutions, including process streamlining, outreach business planning, laboratory stewardship, and more.

Laboratory Outreach Solutions and Business Planning

Workflow Solutions and Space Planning

Laboratory and Pharmacy Stewardship Solutions

Laboratory Analytics and Reporting Tools | ARUP AnalyticsDx^TM

View All Advisory Services

For Researchers: Clinical Research Services Our team of experienced project managers is available to assist you in companion diagnostic development, clinical trial studies, academic research, and expert pathology review.

Clinical and Academic Research Our Clinical Trials group supports a variety of research efforts, including academic research initiatives, and serves clients from central laboratories, clinical research organizations (CROs), in vitro device (IVD) manufacturers, and more. Discover all of our services.

Pharmaceutical Services ARUP offers companion diagnostics and central pathology review services as part of our comprehensive pharmaceutical services. Explore our capabilities and more.

View All Clinical Research Services

ARUP Institute for Research and Innovation in Diagnostic and Precision Medicine™ We accelerate the development and adoption of cutting-edge diagnostic and prognostic technologies advancing patient care through groundbreaking science and engineering. The Sherrie Perkins Research and Innovation Collaboration Grant The Sherrie Perkins Research and Innovation Collaboration Grant funds cutting-edge research in laboratory medicine.
Education Center

Continuing Education

ARUP Expert Insights

Education Events

MLS Faculty and Student Resource Center

Free Continuing Education Credits ARUP provides free CME, P.A.C.E.^®, and Florida credits for laboratory professionals.

CME Credit

P.A.C.E.^® Credit

Florida Credit

View All Courses

Expert-Led Spotlight Video Series Take your learning to the next level with these short lectures. Videos are typically less than 10 minutes and cover a variety of topics such as test utilization, testing technologies, new test explanations, and more.

Podcast Episodes Stay up to date on trending laboratory medicine topics with our LabMind podcast.

Research Publications Explore our experts’ most recent publications in peer-reviewed sources.

Posters and Presentations Request a poster presentation from a recent conference or event.

Live Webinars Attend our live webinars for insightful, interactive conversations around the latest trends and advancements in laboratory medicine.

Upcoming Regional Conferences Join our experts at upcoming educational conferences and ARUP-sponsored events. Program agendas, registration information, event locations, and more can be found here. Request an ARUP Speaker Bring our experts directly to your facility with our diverse educational offerings. Choose from a variety of topics, delivered in person or via webinar.

Access Free Online Resources Enhance your medical laboratory science (MLS) program with our free online resource center. Integrate these curated resources into your curriculum to enrich valuable student-faculty engagement.
About

Contact Us

About Us

Careers

News

Employee Resources

Compliance

Contact Us Contact our support team any time through our 24/7 phone assistance, live chat options, or directly via email.

Media Coverage and Inquiries Contact an ARUP media specialist about photos, press releases, interviews, quotes, and more.

Sales and Account Inquiries Request to speak to your local account executive or to set up a new account with ARUP.

Healthcare Advisory Services Request Contact an ARUP healthcare consultant to learn more about how you can optimize your laboratory operations, generate more revenue, and improve patient care.

About Us ARUP Laboratories is a national, academic, and nonprofit reference laboratory at the forefront of diagnostic medicine. With more than 40 years of experience supporting clients through unparalleled quality and service, our goal is to continually drive positive change for healthcare systems and their patients.Learn More

Our Experts Explore the breadth and depth of expertise available from ARUP’s 150+ medical directors, genetic counselors, pathologists, specialty scientists, and consultants, most of whom are on-site.

Explore Our Culture ARUP offers an enriching work environment with exceptional benefits, flexible hours, and an inclusive company culture that fosters pride among employees.

Start Your Journey With ARUP Explore exciting career opportunities across a variety of fields and experience levels. Open positions are posted in one convenient location so you can easily find your perfect fit.

Browse All Open Positions

Explore the ARUP Newsroom Stay informed about the latest from ARUP. Explore press releases, news articles, our Magnify publication, and more.

Press Releases

Recent Articles

Media Resources

Magnify Magazine

Employee Benefits ARUP employees can review their employee benefits, including medical coverage and open enrollment information, long-term absence arrangements, employee assistance programs, and other resources.

Wellness Center Employees can access a team of dedicated wellness coaches for private or group classes, nutrition information, recovery activities, and more.

Family Health Clinic Employees and their dependents can access free primary care, occupational healthcare, immunization, mental health resources, and more at the Family Health Clinic.

Learning Management Systems Login

Licensure and Accreditations ARUP is a College of American Pathologists (CAP)-, Clinical Laboratory Improvement Amendments (CLIA)-, and International Organization for Standardization (ISO) 15189-accredited laboratory. Additionally, ARUP meets all regulations for labeling non-FDA approved test methods offered by ARUP.

Medicare Coverage Information Learn about the restrictions around Medicare billing and reimbursement before you order an ARUP test.

Public Health Reporting Learn about ARUP's policy regarding public health reporting and how we stay in compliance with state regulations.

Privacy and HIPAA Review our policies and practices for HIPAA and GDPR compliance.

ARUP Compliance Policy

Browse Tests A-Z

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Allergens

Breadcrumb

ARUP Home
Lab Test Directory
Ewing Sarcoma (O13) by Immunohistochemistry (Inactive as of 01/20/26)

2004055

Ewing Sarcoma (O13) by Immunohistochemistry (Inactive as of 01/20/26)

01-20-2026

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.

88342

We value your Feedback.

Feedback

I want to provide feedback regarding

Comment

First Name

Last Name

Email

Client ID

CAPTCHA

Get new captcha!

What code is in the image?

Enter the characters shown in the image.

This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.

Leave this field blank

Live Chat

About

About
Careers
News
Press Releases

Testing

Laboratory Test Directory
Choose the Right Test
Resources

Education Center

Continuing Education
Expert Videos
Podcast Episodes
Events

Contact Us

24/7 Phone Support
Sales Inquiries

By continuing to browse our website, you agree to the use of cookies in accordance with our Privacy Policy.

© 2026 ARUP Laboratories. All Rights Reserved.