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Limited scope X-ray · Colorado

Colorado Limited X-Ray Exam Prep: Limited Scope Operator (LSO)

ARRT Limited Scope examChecked against official state sources

Colorado at a glance

Credential
Limited Scope Operator (LSO), CDPHE
Exam
ARRT Examination for the Limited Scope of Practice in Radiography
Exam sections
Core, Chest, Extremities, Skull/Sinuses and Spine
Pass mark
75% on Core, and an average of 75% across the four procedure modules
Research checked
November 6, 2026

Colorado's limited X-ray rules

Colorado's CDPHE registers Limited Scope Operators (LSOs). Under 6 CCR 1007-1 Part 2, Appendix 2D, every LSO candidate takes the ARRT Limited Scope Core plus all four procedure modules: chest, extremities, skull/sinuses and spine. There's no body-area-only LSO, and podiatric isn't included.

Colorado scores the modules differently from most states: you need 75% on the Core and an average of 75% across the four modules, rather than 75% on each one.

Worth knowing

  • Training: 80 hours didactic, 480 hours clinical and 84 documented exams.
  • Three attempts within 2 years; you retake only the sections you failed, and your highest section scores are used.
  • Bone densitometry is a separate Bone Densitometry Operator registration (ARRT BDEO at a scaled 75 or more, or ISCD CBDT plus 9 hours of radiation safety).

What you'll study for Colorado

Choose Colorado when you sign up and your practice questions, micro lessons and timed mock exams cover the core and the chest, extremities, skull/sinuses and spine modules, with nothing from modules Colorado doesn't use. Mock exams are weighted like the real one and scored section by section; we call you ready at 75% on every section.

SectionPractice questionsMicro lessons
Core (patient care, radiation safety, image production)1,806132
Chest24211
Extremities71841
Skull/Sinuses13410
Spine23212

A question or lesson that fits two sections is counted in both.

Start free with Colorado

Your state's modules and pass mark are set for you. One practice set per module every day and free micro lessons, no card needed.

Start free with ColoradoBrowse lessons

Official sources for Colorado

Where these facts come from. Rules change, so the board's own pages are the final word.

Colorado limited X-ray FAQ

Does Colorado average the module scores?

Yes. Colorado requires 75% on the Core and an average of 75% across the chest, extremities, skull/sinuses and spine modules. Limited X-Ray Prep still coaches you to 75% on every section so no single module drags the average down.

How many times can I take the Colorado LSO exam?

Colorado allows three attempts within 2 years. You retake only the sections you failed, and your highest section scores are used.

Which modules are on the Colorado LSO exam?

The core (patient care, radiation safety and image production) plus Chest, Extremities, Skull/Sinuses and Spine. The set is fixed by the license rather than picked by the candidate.

What score do I need to pass the Colorado LSO exam?

75% on Core, and an average of 75% across the four procedure modules. Limited X-Ray Prep only calls you ready once you reach 75% on every section.

How do I study for the Colorado Limited Scope Operator (LSO) exam with Limited X-Ray Prep?

Pick Colorado when you create your free account. Your practice questions, micro lessons and timed mock exams then cover Core, Chest, Extremities, Skull/Sinuses and Spine, and your dashboard scores each section against Colorado's pass mark.

More on limited scope X-ray

Other states using the ARRT Limited Scope exam

ArizonaArkansasCaliforniaDelawareFloridaIllinoisIndianaIowaKentuckyLouisianaMaineMarylandMassachusettsMinnesotaMontanaNebraskaNevadaNew HampshireNew JerseyNorth DakotaOregonPennsylvaniaTennesseeTexasUtahVirginiaWisconsinWyoming