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Richmond Agitation Sedation Scale Calculator

Score ICU patient sedation and agitation levels using the RASS scale. Enter values for instant results with step-by-step formulas.

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Formula

RASS Score: -5 (unarousable) to +4 (combative)

The RASS is a 10-point scale assessed in three sequential steps: (1) observe for spontaneous activity, (2) verbal stimulation if not spontaneously alert, (3) physical stimulation if no response to voice. Positive scores indicate agitation, zero indicates alert and calm, and negative scores indicate sedation levels.

Worked Examples

Example 1: Post-Intubation Sedation Assessment

Problem: A mechanically ventilated patient is receiving propofol and fentanyl infusions with a RASS target of -2 (light sedation). When called by name, the patient briefly opens eyes and makes eye contact for 5 seconds before closing eyes again.

Solution: Step 1: Patient is not spontaneously alert (not RASS 0 to +4)\nStep 2: Verbal stimulation - patient opens eyes briefly with eye contact < 10 seconds\nThis matches RASS -2: Light Sedation\nTarget RASS: -2\nDifference: 0 (at target)

Result: RASS Score: -2 (Light Sedation) | At Target | Continue current sedation regimen

Example 2: Agitated Delirious Patient

Problem: A patient is pulling at their endotracheal tube and attempting to climb out of bed. The RASS target is -1 (drowsy). Assess the RASS score and determine the gap from target.

Solution: Step 1: Observe patient without stimulation\nPatient is pulling at tubes and attempting to get out of bed\nThis matches RASS +3: Very Agitated (pulls/removes tubes, aggressive)\nTarget RASS: -1\nDifference: +3 - (-1) = 4 points above target

Result: RASS Score: +3 (Very Agitated) | 4 points above target | Assess for pain/delirium, administer sedative

Frequently Asked Questions

What is the Richmond Agitation-Sedation Scale?

The Richmond Agitation-Sedation Scale (RASS) is a 10-point validated assessment tool used to measure the level of agitation or sedation in ICU patients. Developed by Sessler and colleagues at Virginia Commonwealth University in 2002, it uses a scale ranging from +4 (combative) through 0 (alert and calm) to -5 (unarousable). The RASS was specifically designed for ICU patients and has become the most widely used sedation assessment tool in critical care settings worldwide. It is recommended by the Society of Critical Care Medicine in their Pain, Agitation, and Delirium (PAD) guidelines as the preferred sedation scale. The RASS takes approximately 20 seconds to perform and requires no special equipment, making it practical for frequent bedside assessments.

What causes agitation in ICU patients?

Agitation in ICU patients, reflected by positive RASS scores, has multiple potential causes that should be systematically evaluated before simply increasing sedation. The most common cause is undertreated pain, which should be assessed using validated pain scales like the Critical-Care Pain Observation Tool (CPOT) or Behavioral Pain Scale (BPS). Delirium is another major cause of agitation and requires targeted treatment rather than increased sedation. Physiological causes include hypoxia, hypercapnia, hypoglycemia, urinary retention, constipation, and fever. Environmental factors such as noise, sleep disruption, and physical restraints can also contribute. Medication-related causes include alcohol or drug withdrawal, paradoxical reactions to benzodiazepines, and akathisia from antipsychotics. Addressing the underlying cause is always preferable to simply masking agitation with sedatives.

What is the difference between RASS and the Riker Sedation-Agitation Scale?

Both the RASS and the Riker Sedation-Agitation Scale (SAS) are validated ICU sedation assessment tools, but they have important differences. The RASS uses a 10-point scale from -5 to +4 with discrete, well-defined behavioral descriptors at each level, while the SAS uses a 7-point scale from 1 (unarousable) to 7 (dangerous agitation). RASS was specifically designed with a standardized assessment procedure that includes sequential observation, verbal stimulation, and physical stimulation steps, making it more reproducible between assessors. The RASS has demonstrated excellent inter-rater reliability with weighted kappa values of 0.91 to 0.94. The SAS has slightly less granularity on the sedation end of the spectrum. The RASS is more widely used in current practice and is specifically recommended by the 2018 PADIS guidelines, partly because the CAM-ICU delirium tool was validated using RASS as its companion sedation assessment.

How accurate are the results from Richmond Agitation Sedation Scale Calculator?

All calculations use established mathematical formulas and are performed with high-precision arithmetic. Results are accurate to the precision shown. For critical decisions in finance, medicine, or engineering, always verify results with a qualified professional.

Can I use Richmond Agitation Sedation Scale Calculator on a mobile device?

Yes. All calculators on NovaCalculator are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.

How do I interpret the result?

Results are displayed with a label and unit to help you understand the output. Many calculators include a short explanation or classification below the result (for example, a BMI category or risk level). Refer to the worked examples section on this page for real-world context.

References