Overdose call

An overdose call is a public-safety request or response categorized as a suspected overdose or poisoning involving a substance. The classification may begin with a caller's description before assessment. It does not, by itself, confirm the substance, intent, diagnosis, treatment, or outcome. An overdose-call count is different from a count of overdose deaths.

The source determines the level of confirmation

Dispatch information, a responder's assessment, hospital records, and death-investigation findings capture different stages. A category assigned during call taking can change when more information becomes available. The label should retain “suspected” when the evidence remains preliminary.

CDC's overdose resources separate fatal-overdose data, hospital-discharge information, and syndromic surveillance, which uses electronic health-record information to identify suspected events. Those are distinct surveillance sources; a local dispatch list is not automatically equivalent to any of them. CDC overdose data resources

The type of substance and the person's intent also require evidence. A call cannot automatically establish opioid involvement, deliberate self-harm, or a substance use disorder merely because it is labeled overdose.

Example

Hypothetical example: A caller reports concern that a person may have taken too much medication. The request is initially coded as a suspected overdose. Responders assess the person and create their own clinical record, while the public dispatch summary shows only the request type and a transport-related outcome.

The summary supports describing a suspected-overdose response and the recorded action. It does not establish which medication was involved, a laboratory finding, the person's intent, or the eventual hospital outcome. The example gives no treatment instructions or invented diagnosis.

Common confusion

A drug-related call can concern many issues other than overdose. An overdose call can involve a prescribed medicine or other substance and does not automatically indicate illicit drug use.

A transport identifies movement to a destination, not proof of a confirmed overdose. A fatal overdose is a death classification based on a different source and process. Subtracting one dataset's deaths from another dataset's calls does not produce a reliable count of nonfatal overdoses.

Interpreting trends

Specify whether the measure counts contacts, incidents, patients, emergency-department visits, or deaths. Multiple services can record one response, and one person can appear repeatedly. Check inclusion rules, data lag, revisions, and geographic coverage before comparison. A change in coding, screening, or participation can affect totals independently of underlying frequency. Protect that distinction when describing preliminary activity as a community health indicator.

Related terms

• Behavioral health crisis
• Emergency call
• Incident report
• Disposition

Sources

• CDC — Overdose Prevention Data Resources: separate fatal, discharge, and syndromic surveillance sources.
• CDC — DOSE-SYS Nonfatal Overdose Syndromic Surveillance Data: suspected events derived from health records, distinguished here from dispatch calls.