YMRS — Young Mania Rating Scale
The Young Mania Rating Scale (YMRS) is an 11-item clinician-rated scale used to assess the severity of manic symptoms in patients with bipolar disorder. It is one of the most widely used instruments for evaluating mania in clinical and research settings.
About
The Young Mania Rating Scale (YMRS) was developed by Dr. Robert Young and colleagues in 1978 as a clinician-administered rating scale for assessing manic symptom severity. The scale consists of 11 items covering core manic symptoms: elevated mood, increased motor activity-energy, sexual interest, sleep, irritability, speech (rate and amount), language-thought disorder, content, disruptive-aggressive behavior, appearance, and insight. Most items are rated on a 5-point scale (0-4), while four items (5, 6, 8, 9) are rated on an 9-point scale (0-8) to account for variability in these symptoms. Total scores range from 0 to 60, with higher scores indicating more severe mania. The YMRS demonstrates excellent inter-rater reliability, internal consistency, and convergent validity with other mania rating scales. It requires approximately 15-30 minutes to administer and remains the gold standard for mania assessment in clinical trials and practice.
Formula
YMRS Score = q1 + q2 + q3 + ... + q11 (items 1-4,7,10,11 rated 0-4; items 5,6,8,9 rated 0-8)
The YMRS score is the sum of all 11 item ratings. Seven items (elevated mood, activity-energy, sexual interest, sleep, irritability, speech rate, language-thought disorder, content, disruptive-aggressive behavior, appearance, insight) are rated 0-4. Four items (5: speech rate and amount, 6: language-thought disorder, 8: content, 9: disruptive-aggressive behavior) are rated 0-8. The total score ranges from 0 to 60, with higher scores indicating greater manic symptom severity.
Score Interpretation
The YMRS is the most widely used clinician-rated scale for assessing manic symptom severity in both clinical practice and research. It demonstrates strong psychometric properties with high inter-rater reliability (ICC = 0.93-0.97), internal consistency (α = 0.72-0.91), and test-retest reliability. The scale is sensitive to treatment effects and is the primary outcome measure in most bipolar disorder clinical trials. The YMRS covers the full range of manic symptoms per DSM-5 criteria and can distinguish between acute mania, hypomania, and euthymic states. A score of 20-25 is commonly used as an entry criterion for clinical trials. The YMRS is recommended by the ISBD (International Society for Bipolar Disorders) and is endorsed by regulatory agencies including the FDA for use in clinical trials of bipolar disorder treatments.
Normal/Remission — 0–12
Score 0-12. No significant manic symptoms.
Management: Continue maintenance treatment if diagnosed with bipolar disorder. Monitor for prodromal symptoms.
Minimal/Mild — 13–19
Score 13-19. Minimal or mild manic symptoms.
Management: Monitor for worsening symptoms. Consider outpatient follow-up within 1-2 weeks.
Moderate — 20–25
Score 20-25. Moderate manic symptoms.
Management: Psychiatric evaluation recommended. Consider mood stabilizer adjustment or initiation.
Severe — 26–60
Score 26-60. Severe manic symptoms requiring urgent intervention.
Management: Urgent psychiatric evaluation. Consider hospitalization for stabilization and safety.
Reference Ranges
| Population | Normal Range | Notes |
|---|---|---|
| Adults with bipolar disorder | 0 – 12 (Remission) | No clinically significant manic symptoms |
| Adults with bipolar disorder | 13 – 19 (Minimal/Mild) | Subsyndromal or mild manic symptoms |
| Adults with bipolar disorder | 20 – 25 (Moderate) | Moderate mania; treatment adjustment indicated |
| Adults with bipolar disorder | 26 – 60 (Severe) | Severe mania; urgent intervention needed |
Dr. Ahmed Abdelrahman
Dr. Ahmed is a healthcare management consultant with over 15 years of experience in clinical practice and medical education.
View medical review board & editorial policy →Example Calculation
A 28-year-old male with known bipolar I disorder presents with 5 days of decreased sleep, grandiose plans, rapid speech, and increased spending. On YMRS assessment: elevated mood (3), increased motor activity (3), sexual interest (2), decreased sleep (4), irritability (6), rapid speech (5), pressured speech with flight of ideas (3), grandiose content (5), no aggression (2), unkempt appearance (2), poor insight (4). Total YMRS score = 39/60. Clinical recommendation: urgent psychiatric evaluation, initiate or adjust mood stabilizer, consider hospitalization for safety given poor insight and grandiosity.
Related Conditions
Related Medications
Common Mistakes
Not accounting for the differential weighting of items (0-4 vs 0-8)
Items 5, 6, 8, and 9 are rated 0-8, not 0-4. These items capture more variability in core manic symptoms and contribute more to the total score.
Using YMRS as a diagnostic tool rather than a severity scale
YMRS measures symptom severity, not diagnosis. A structured diagnostic interview (SCID, MINI) is needed for bipolar disorder diagnosis.