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Patient Experience, GuideWhat Are CROM? (Clinician-Reported Outcome Measures)
Definition, types and clinical application in health outcomes measurement
CROM (Clinician-Reported Outcome Measures) are health outcome measures recorded by healthcare professionals based on their direct clinical observation: laboratory parameters, disease stages, clinical scales, and diagnostic test data.
They represent the objective, scientific-technical perspective on a patient's health status. Together with PROMs (the patient's subjective perspective) and PREMs (the experience of the care process), they form the complete health outcome measurement system for Value-Based Healthcare (VBHC).
Without CROM, there is no rigorous clinical assessment. Without PROM, you don't know how the patient experiences their illness. Without PREM, you don't know how they experienced the care they received. All three are essential.
Riccardo Begelle, 2026 
15 min 
What Are CROM? A Clear and Complete Definition
CROM, short for Clinician-Reported Outcome Measures, are health outcome measures recorded directly by healthcare professionals based on their clinical observation and assessment. They include laboratory data, physiological parameters, disease activity scales, clinical stages, diagnostic test data, and any other objective measure that the clinician records in the context of patient care.
Unlike PROMs, where the data is generated by the patient themselves, in CROM it is the professional who observes, evaluates, and records. That is why they are called Clinician-Reported: the clinician is the source of the data.
""CROM are objective measures recorded by the clinician, including scales, laboratory data, diagnostic test data, toxicity scales, functional stages, or specific counts of the clinical condition."
— Grossat, E.; Varela Rodríguez, C. — Ch. 2.8, SECA Guide for VBHC Implementation (2025)
— Grossat, E.; Varela Rodríguez, C. — Ch. 2.8, SECA Guide for VBHC Implementation (2025)
The fundamental conceptual distinction underlying CROM is the difference between signs and symptoms. Signs are objective manifestations of disease observable by the clinician: fever, edema, heart murmurs, skin lesions, blood glucose levels. Symptoms are subjective manifestations perceived and reported by the patient: pain, fatigue, sadness, difficulty breathing. CROM capture signs; PROM capture symptoms.
This distinction is not merely academic. It has direct consequences for clinical decision-making: a patient may have completely normalised laboratory parameters (CROM within reference range) while simultaneously reporting intense fatigue, persistent pain, or severely deteriorated quality of life (abnormal PROM). Without measuring both dimensions, care is incomplete.
Foundation of CROM and PROM
Sign → observable by the clinician → recorded via CROM
Example: blood glucose 340 mg/dL, DAS28 = 5.2, TNM stage III, ejection fraction 35%
Symptom → perceived by the patient → recorded via PROM
Example: "I feel very tired," "I have constant joint pain," "I can no longer do the things I used to do"
Health outcomes emerge from the integration of both dimensions. Only by combining CROM and PROM is the complete picture of the patient's real condition obtained.
Types of CROM: Clinical, Medical Device, and Nursing
CROM are not a single type of measure. The SECA Guide 2025 distinguishes three categories within indicators recorded from the perspective of the professional or the healthcare system, each with its own characteristics and uses:
| Type | Who records? | What it captures | Examples |
|---|---|---|---|
| CROM (Clinician-Reported Outcomes) | Healthcare professional (physician, nurse, physiotherapist…) | Observable objective signs: laboratory parameters, disease stages, joint counts, toxicity scales, diagnostic test data. | DAS28 (arthritis), TNM stage (oncology), NIHSS scale (stroke), CTCAE toxicity, Child-Pugh index (hepatology) |
| MDROM (Medical Device-Reported Outcomes) | Medical device or monitoring system (wearable, biosensor, remote monitor) | Physiological and functional variables captured continuously and in real time: heart rate, O₂ saturation, blood glucose, physical activity, sleep patterns. | Continuous glucose monitors, pulse oximeters, cardiac Holter, activity sensors, home telemonitoring systems |
| NOC (Nursing Outcomes Classification) | Nursing professional | Impact of care on the physical, psychological, and social dimensions of the patient. Complementary to CROM and PROM. | Mobility scales, pain control, nutritional status, self-care capacity, family functioning |
Clinical CROM: Direct Professional Assessment
These are CROM in the strict sense: measures recorded by the physician, nurse, or any other healthcare professional based on their direct evaluation of the patient. They are the backbone of the traditional clinical record and evidence-based medicine. Their main advantage is objectivity and standardisation; their main risk is inter-observer variability, especially in scales that incorporate some degree of subjective judgment.
Common examples by specialty: in rheumatology, joint counts and the DAS28 index for rheumatoid arthritis; in oncology, TNM staging and CTCAE toxicity scales; in neurology, the NIHSS scale for stroke or the EDSS scale for multiple sclerosis; in cardiology, ventricular ejection fraction and NYHA functional classification; in hepatology, the Child-Pugh index.
MDROM: When the Data Is Generated by the Medical Device
Medical Device-Reported Outcome Measures (MDROM) are an emerging category within CROM. They are indicators generated directly by medical devices or monitoring systems, without active clinician involvement at the time of recording: continuous glucose monitors, pulse oximeters, cardiac Holter monitors, physical activity sensors, home telemonitoring systems.
Their main advantage over classical CROM is the ability to generate continuous, real-time data, enabling early detection of complications, reduced hospitalisations, and dynamic personalisation of care. With the expansion of wearables and the Internet of Things (IoT) in healthcare, MDROM are set to become an enormously valuable source of clinical data in the coming years.
However, they also present specific challenges not yet fully resolved: the lack of robust clinical validation in many devices, interoperability issues with electronic health records, privacy risks, and regulatory difficulties for their acceptance as endpoints in clinical trials and reimbursement decisions.
Key international MDROM frameworks
FDA V3/V3+ Framework: standard for digital endpoint qualification.
FDA 2023 Digital Health Technologies (DHT) Guidelines: regulatory framework for the acceptance of device data as evidence in clinical decisions.
EMA Qualification (SV95C): first precedents for the acceptance of digital endpoints in Europe.
FAIR Principles: framework to ensure device data is Findable, Accessible, Interoperable, and Reusable.
Demonstrated benefits: early detection of complications, reduced hospitalisations, improved adherence and self-care, robust evidence for HTA and reimbursement decisions.
CROM vs PROM: Key Differences and Why Both Are Needed Together
Confusion between CROM and PROM is common among those approaching health outcome measurement for the first time. The following table summarises their fundamental differences:
| CROM | PROM | |
|---|---|---|
| What does it measure? | Objective signs of disease recorded by the clinician or device. | Symptoms, quality of life, and functionality as perceived by the patient. |
| Data source | Healthcare professional or medical device. | The patient, via standardised questionnaire. |
| Nature of the data | Objective and standardised (though with potential inter-observer bias). | Subjective and self-reported, but psychometrically validated. |
| What does it capture that the other cannot? | Signs the patient does not perceive or cannot describe accurately (e.g., laboratory values, radiological lesions). | Symptoms the clinician cannot directly observe: pain, fatigue, emotional impact, quality of life. |
| Main risk | Inter-observer variability; may not reflect what matters to the patient. | Memory or social desirability bias; does not replace objective clinical assessment. |
| Are they mutually exclusive? | No. Their integration provides the complete clinical picture. | No. Their integration provides the complete clinical picture. |
The complementarity between CROM and PROM is one of the most firmly established principles in the Value-Based Healthcare literature. The reason is structural: each captures a dimension of the patient's reality that the other cannot observe.
""PROM and CROM are complementary: the former allow the patient's experience and the impact of illness on quality of life to be captured, while the latter allow clinical assessment to be standardised. Their integration provides a multidimensional view of the care process."
— Grossat, E.; Varela Rodríguez, C. — Ch. 2.8, SECA Guide for VBHC Implementation (2025)
— Grossat, E.; Varela Rodríguez, C. — Ch. 2.8, SECA Guide for VBHC Implementation (2025)
An example that illustrates this complementarity well is the treatment of rheumatoid arthritis. The DAS28 (CROM) allows the rheumatologist to objectively quantify disease activity by measuring joint counts and laboratory parameters. But that same patient may have a DAS28 in remission while simultaneously reporting intense fatigue and severe functional limitation that the index does not detect. Only by adding a PROM specific to fatigue or functionality is the complete picture obtained that allows truly patient-centred decisions to be made.
Las CROM en la Asistencia Sanitaria Basada en Valor: el pilar objetivo
CROM in Value-Based Healthcare: The Objective Pillar
In the Value-Based Healthcare (VBHC) model, CROM are the pillar of objective measurement. Without them, it is not possible to evaluate the clinical effectiveness of interventions, compare outcomes across centres, or generate the scientific evidence underpinning clinical practice guidelines and reimbursement decisions.
Organisations such as ICHOM (International Consortium for Health Outcomes Measurement) have designed their standard sets by consistently combining CROM and PROM. The principle is clear: to measure the value of care for a specific clinical condition, you need to know what happened clinically (CROM) and how the patient experienced it (PROM). Separating both dimensions impoverishes the analysis.
Key international references for CROM standardisation
ISPOR (International Society for Pharmacoeconomics and Outcomes Research): has developed good practice guidelines for the evaluation of Clinical Outcome Assessments (COA), including CROM.
FDA — Clinical Outcome Assessment guidance: the US regulatory agency has established a framework for the qualification of CROM as endpoints in clinical trials and drug approval decisions.
ICHOM Standard Sets: more than 40 standardised sets of outcome measures integrating CROM and PROM for specific clinical conditions such as breast cancer, diabetes, heart failure, and depression.
COMET Initiative: promotes the definition of core outcome sets for clinical trials, reducing heterogeneity in measure selection and increasing comparability of results.
OMOP Common Data Model (OHDSI): standardised model for integrating and analysing clinical data from different sources, facilitating large-scale multicentre research with harmonised CROM and PROM.
The effective adoption of CROM in routine clinical practice requires overcoming concrete barriers. The SECA Guide 2025 identifies the main ones: inter- and intra-observer variability, workload and bureaucratisation risk, lack of standardisation of scales and manuals, insufficient training in interpretation, and low perceived usefulness when data are not integrated into clinical decisions.
The most effective facilitators are international good practice guidelines (ISPOR, FDA), standardised manuals with recertification programmes, integration into electronic health records with dashboards, and periodic feedback to clinicians on the recorded outcomes.
Does Your Centre Integrate CROM, PROM, and PREM in a Single System?
RateNow facilitates the collection and correlation of PROMs and PREMs with validated questionnaires and digital channels, integrable with the clinical workflows where CROMs are already collected.
→ Request a free demo at sales@ratenow.cx
References
1. Grossat E, Varela Rodríguez C. Tools, facilitators and barriers in the use of health outcome indicators: CROM and PROM. In: Varela Rodríguez C (ed.). Guide for the Implementation of Value-Based Healthcare. Madrid: SECA; 2025. Ch. 2.8:355-372.
2. Powers JH 3rd, Patrick DL, Walton MK, et al. Clinician-reported outcome assessments of treatment benefit: report of the ISPOR Clinical Outcome Assessment Emerging Good Practices Task Force. Value Health. 2017;20(1):2-14.
3. U.S. Food and Drug Administration. Clinical Outcome Assessment (COA): Frequently Asked Questions. Silver Spring (MD): FDA; 2020.
4. International Consortium for Health Outcomes Measurement (ICHOM). Standard Sets. Boston: ICHOM; 2012. ichom.org/standard-sets
5. Williamson PR, et al. The COMET Handbook: version 1.0. Trials. 2017;18(Suppl 3):280.
6. Hripcsak G, et al. Observational Health Data Sciences and Informatics (OHDSI). Stud Health Technol Inform. 2015;216:574-8.
7. Porter ME. What is value in health care? N Engl J Med. 2010;363(26):2477-81.
Are CROM and traditional clinical indicators the same thing?
Largely yes, although the term CROM emphasises that they are outcome measures and not merely process or structural measures. A joint count or a blood test is a CROM when used to assess the impact of care on the patient's health status.
Is data from a wearable a CROM?
Technically they are MDROM (Medical Device-Reported Outcomes), a subcategory of CROM. The distinction matters because MDROM have specific characteristics regarding validation, regulation, and integration into information systems.
Can CROM be biased?
Yes. The main bias is inter-observer bias: two clinicians may score the same scale differently. This is why standardisation through manuals and training is fundamental. Attribution bias can also exist, where the clinician focuses on expected adverse effects rather than all symptoms experienced by the patient.
What are NOC and how do they relate to CROM?
Nursing Outcomes Classification (NOC) are measures recorded by nursing staff that assess the impact of care on the physical, psychological, and social dimensions of the patient. They are complementary to both CROM and PROM, although they are not yet systematically integrated into most VBHC programmes.
Can CROM and PROM be collected on the same platform?
Yes. Digital outcome measurement platforms allow the collection, analysis, and correlation of CROM and PROM to be integrated within the same workflow, facilitating clinical decision-making with a complete view of the patient's condition.
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