YMRS: Young Mania Rating Scale

What this assessment is

The Young Mania Rating Scale, or YMRS, is an 11-item clinician-rated measure of current manic symptoms.

It produces a total from 0 to 60. Higher scores indicate greater symptom severity.

Seven ratings use a 0-to-4 range. Four ratings use a 0-to-8 range and therefore carry more weight in the total.

Weighting matters.

YMRS is used to describe severity and track change. It is not a diagnostic interview.

A score cannot establish a manic episode by itself.

This page covers the original adult clinician-rated scale. It does not cover a parent-rated adaptation or another modified form.

Who it was designed for

Young and colleagues introduced the scale in 1978 for rating mania. The original publication describes the 11-item clinician assessment and its reliability.

YMRS is used most often with adults who have bipolar disorder or possible manic symptoms across inpatient, outpatient, emergency, and research settings.

Settings differ.

The assessment requires clinical skill.

Some ratings depend on the person's report, while others depend on behavior observed during the interview, so the clinician must use all available evidence.

Insight can change.

YMRS does not cover every feature needed for a bipolar diagnosis. It also gives limited detail about depression and mixed presentations.

Use a broader diagnostic assessment when diagnosis is the question.

How it is administered

A trained clinician interviews the person and observes behavior during the assessment.

The scale usually takes 15 to 30 minutes, and ratings commonly reflect the previous 48 hours as well as behavior during the interview.

Timeframes matter.

Use the same timeframe at each assessment.

Before rating, record:

• the exact YMRS version
• the assessment period
• the setting and information sources
• current medicines and recent changes
• sleep, substance use, and acute medical factors
• the rater

Interview behavior matters, but one brief encounter can miss symptoms that vary across the day.

State changes quickly.

Collateral information may be necessary when the person's account and observed behavior differ.

Use the standard rating criteria. Do not convert the scale into a self-report checklist.

What it measures

YMRS samples several features associated with mania. These include elevated or irritable mood, increased activity, reduced sleep, faster thought and speech, unusual thought content, disruptive behavior, and insight.

The total combines these features into one severity summary.

The four 0-to-8 ratings contribute more, so a one-step change there moves the total more than the same change on another rating.

Weight is unequal.

Review the profile.

The ASRM is a five-item self-report measure of manic symptoms over the past week. YMRS is longer, clinician rated, and uses interview behavior as part of the evidence.

The two measures can complement each other. Their totals are not comparable.

How scoring works

The clinician assigns a value to each of the 11 ratings using the standard anchors.

Seven ratings range from 0 to 4. Four ratings range from 0 to 8.

Adding all values produces a total from 0 to 60.

Higher totals indicate greater clinician-rated manic symptom severity.

Do not rescale the 0-to-8 ratings to 0-to-4. Their extra weight is part of the original scoring method.

Do not divide the total by 60 and call it a percentage of mania. YMRS is not a percentage scale.

No general missing-item or prorating rule applies. If an item cannot be rated, use the protocol for the exact setting or mark the result incomplete.

Keep the item profile with the total.

How to interpret a YMRS score

Interpret the total as a summary of manic symptom severity during the stated period.

Higher values indicate greater severity, and change is most meaningful when the version, timeframe, rater method, and setting stay stable.

Method changes obscure change.

Some services and studies use thresholds near 20 or 25 to define entry criteria, probable mania, or marked illness. These thresholds are not universal diagnostic boundaries.

Do not treat them as one.

A severity and change study linked scores near 25 with marked illness in its sample and estimated a meaningful group-level change. Those findings depend on the population and purpose.

Look at the individual ratings. Sleep change, insight, or disruptive behavior may need attention even when the total is below a study threshold.

Explain the score in clinical terms.

What the score cannot tell you

YMRS cannot diagnose bipolar disorder or a manic episode by itself.

It cannot determine whether symptoms come from bipolar disorder, substance use, medicine effects, sleep deprivation, psychosis, neurological illness, or another medical condition.

The total gives limited information about depression, mixed features, daily function, and treatment preference.

A lower score does not prove recovery or treatment benefit. A higher score does not identify the correct treatment.

The scale also cannot replace a direct assessment of safety, judgment, capacity, or urgent medical causes.

Do not use the total alone for admission, discharge, or medication decisions.

Combine it with history, examination, collateral information, function, and diagnostic criteria.

Evidence and limitations

YMRS is widely used and sensitive to change in manic symptoms. The weighted ratings give extra influence to features that the developers considered central to clinical severity.

That weighting also means the same total can arise from different symptom patterns.

An unchanged total can hide a shift from reduced sleep and increased activity toward irritability, disruptive behavior, or unusual thought content.

Rater training and interview quality affect reliability. Insight, communication, sedation, environment, and the availability of collateral information can shift the result.

The scale gives limited coverage to some mixed or depressive features. It should not be used as a complete bipolar assessment.

Report the version, timeframe, rater, item profile, total, and relevant clinical context.

A result stored without these details can create a false trend when the rater, setting, or assessment window changes later.

Use the number to organize evidence, not replace it.