What does the Zung SDS measure?

The Zung scale is used for self-assessment of depression severity and includes key symptoms such as low mood, fatigue, sleep disturbances, and general well-being.

How should I take the test?

Evaluate how often you experienced the listed states over the past week. Answer intuitively — there are no right or wrong answers.

Can I repeat the test?

Yes, the Zung scale can be used repeatedly to track changes in your condition over time.

Zung Self-Rating Depression Scale (SDS) online — depression test

Zung Self-Rating Depression Scale (SDS) is one of the most widely used questionnaires for assessing the severity of depression. It reflects key symptoms such as low mood, fatigue, sleep disturbances, and changes in overall well-being.

The test is intended for self-assessment and allows a quantitative evaluation of symptom severity. It can be used repeatedly to monitor changes over time. It is important to note that the result is not a medical diagnosis and does not replace consultation with a specialist.

If you also notice persistent anxiety or unexplained tension in yourself, our anxiety test may help.

If, instead, periods of sadness alternate with periods of unusually elevated energy or reduced need for sleep, you may also be interested in the Bipolar Spectrum Diagnostic Scale (BSDS). Sleep problems can also be linked with depression and worsen its course. If sleep issues are troubling you, we invite you to take our sleep tests online.

The test includes 20 items that determine four levels of depression severity. Read each statement carefully and select the option that best reflects how often you experienced the described states during the past week. Answer intuitively — there are no “right” or “wrong” answers.