diff --git a/static/app/views/detectors/components/forms/metric/visualize.tsx b/static/app/views/detectors/components/forms/metric/visualize.tsx
index 57f3f245e31e52..125b39cb48a8f1 100644
--- a/static/app/views/detectors/components/forms/metric/visualize.tsx
+++ b/static/app/views/detectors/components/forms/metric/visualize.tsx
@@ -39,11 +39,6 @@ import {FieldValueKind} from 'sentry/views/discover/table/types';
 import {DEFAULT_VISUALIZATION_FIELD} from 'sentry/views/explore/contexts/pageParamsContext/visualizes';
 import {TraceItemDataset} from 'sentry/views/explore/types';
 
-const LOCKED_SPAN_COUNT_OPTION = {
-  value: DEFAULT_VISUALIZATION_FIELD,
-  label: t('spans'),
-};
-
 /**
  * Render a tag badge for field types, similar to dashboard widget builder
  */
@@ -93,18 +88,47 @@ function renderTag(kind: FieldValueKind): React.ReactNode {
   return <Tag type={tagType}>{text}</Tag>;
 }
 
-const LOGS_NOT_ALLOWED_AGGREGATES = [
+/**
+ * Aggregate options excluded for the logs dataset
+ */
+const LOGS_EXCLUDED_AGGREGATES = [
   AggregationKey.FAILURE_RATE,
   AggregationKey.FAILURE_COUNT,
+  AggregationKey.APDEX,
 ];
 
+const ADDITIONAL_EAP_AGGREGATES = [AggregationKey.APDEX];
+
+/**
+ * Locks the primary dropdown to the single option
+ */
+const LOCKED_SPAN_AGGREGATES = {
+  [AggregationKey.APDEX]: {
+    value: DEFAULT_VISUALIZATION_FIELD,
+    label: 'span.duration',
+  },
+  [AggregationKey.COUNT]: {
+    value: DEFAULT_VISUALIZATION_FIELD,
+    label: 'spans',
+  },
+};
+
+// Type guard for locked span aggregates
+const isLockedSpanAggregate = (
+  agg: string
+): agg is keyof typeof LOCKED_SPAN_AGGREGATES => {
+  return agg in LOCKED_SPAN_AGGREGATES;
+};
+
 function getEAPAllowedAggregates(dataset: DetectorDataset): Array<[string, string]> {
-  return ALLOWED_EXPLORE_VISUALIZE_AGGREGATES.filter(aggregate => {
-    if (dataset === DetectorDataset.LOGS) {
-      return !LOGS_NOT_ALLOWED_AGGREGATES.includes(aggregate);
-    }
-    return true;
-  }).map(aggregate => [aggregate, aggregate]);
+  return [...ALLOWED_EXPLORE_VISUALIZE_AGGREGATES, ...ADDITIONAL_EAP_AGGREGATES]
+    .filter(aggregate => {
+      if (dataset === DetectorDataset.LOGS) {
+        return !LOGS_EXCLUDED_AGGREGATES.includes(aggregate);
+      }
+      return true;
+    })
+    .map(aggregate => [aggregate, aggregate]);
 }
 
 function getAggregateOptions(
@@ -226,10 +250,9 @@ export function Visualize() {
 
   const datasetConfig = useMemo(() => getDatasetConfig(dataset), [dataset]);
 
-  const aggregateOptions = useMemo(
-    () => datasetConfig.getAggregateOptions(organization, tags, customMeasurements),
-    [organization, tags, datasetConfig, customMeasurements]
-  );
+  const aggregateOptions = useMemo(() => {
+    return datasetConfig.getAggregateOptions(organization, tags, customMeasurements);
+  }, [organization, tags, datasetConfig, customMeasurements]);
 
   const fieldOptions = useMemo(() => {
     // For Spans dataset, use span-specific options from the provider
@@ -334,7 +357,10 @@ export function Visualize() {
   };
 
   const lockSpanOptions =
-    dataset === DetectorDataset.SPANS && aggregate === AggregationKey.COUNT;
+    dataset === DetectorDataset.SPANS && isLockedSpanAggregate(aggregate);
+
+  // Get locked option if applicable, with proper type narrowing
+  const lockedOption = lockSpanOptions ? LOCKED_SPAN_AGGREGATES[aggregate] : null;
 
   return (
     <Flex direction="column" gap="md">
@@ -368,22 +394,20 @@ export function Visualize() {
                 <StyledVisualizeSelect
                   searchable
                   triggerProps={{
-                    children: lockSpanOptions
-                      ? LOCKED_SPAN_COUNT_OPTION.label
+                    children: lockedOption
+                      ? lockedOption.label
                       : parameters[index] || param.defaultValue || t('Select metric'),
                   }}
-                  options={
-                    lockSpanOptions ? [LOCKED_SPAN_COUNT_OPTION] : fieldOptionsDropdown
-                  }
+                  options={lockedOption ? [lockedOption] : fieldOptionsDropdown}
                   value={
-                    lockSpanOptions
+                    lockedOption
                       ? DEFAULT_VISUALIZATION_FIELD
                       : parameters[index] || param.defaultValue || ''
                   }
                   onChange={option => {
                     handleParameterChange(index, String(option.value));
                   }}
-                  disabled={isTransactionsDataset || lockSpanOptions}
+                  disabled={isTransactionsDataset}
                 />
               ) : param.kind === 'dropdown' && param.options ? (
                 <StyledVisualizeSelect
@@ -404,6 +428,7 @@ export function Visualize() {
                 />
               ) : (
                 <StyledParameterInput
+                  size="md"
                   placeholder={param.defaultValue || t('Enter value')}
                   value={parameters[index] || ''}
                   onChange={e => {
diff --git a/static/app/views/detectors/datasetConfig/spans.tsx b/static/app/views/detectors/datasetConfig/spans.tsx
index c1e53d71b45322..3fdc9c8723c33e 100644
--- a/static/app/views/detectors/datasetConfig/spans.tsx
+++ b/static/app/views/detectors/datasetConfig/spans.tsx
@@ -1,6 +1,11 @@
 import {t} from 'sentry/locale';
-import type {EventsStats} from 'sentry/types/organization';
+import type {SelectValue} from 'sentry/types/core';
+import type {TagCollection} from 'sentry/types/group';
+import type {EventsStats, Organization} from 'sentry/types/organization';
+import type {CustomMeasurementCollection} from 'sentry/utils/customMeasurements/customMeasurements';
+import type {AggregateParameter} from 'sentry/utils/discover/fields';
 import {DiscoverDatasets} from 'sentry/utils/discover/types';
+import {AggregationKey, getFieldDefinition} from 'sentry/utils/fields';
 import {MutableSearch} from 'sentry/utils/tokenizeSearch';
 import {EventTypes} from 'sentry/views/alerts/rules/metric/types';
 import {SpansConfig} from 'sentry/views/dashboards/datasetConfig/spans';
@@ -20,6 +25,8 @@ import {
   translateAggregateTag,
   translateAggregateTagBack,
 } from 'sentry/views/detectors/datasetConfig/utils/translateAggregateTag';
+import type {FieldValue} from 'sentry/views/discover/table/types';
+import {FieldValueKind} from 'sentry/views/discover/table/types';
 
 import type {DetectorDatasetConfig} from './base';
 
@@ -27,12 +34,60 @@ type SpansSeriesResponse = EventsStats;
 
 const DEFAULT_EVENT_TYPES = [EventTypes.TRACE_ITEM_SPAN];
 
+function getAggregateOptions(
+  organization: Organization,
+  tags?: TagCollection,
+  customMeasurements?: CustomMeasurementCollection
+): Record<string, SelectValue<FieldValue>> {
+  const base = SpansConfig.getTableFieldOptions(organization, tags, customMeasurements);
+
+  const apdexDefinition = getFieldDefinition(AggregationKey.APDEX, 'span');
+
+  if (apdexDefinition?.parameters) {
+    // Convert field definition parameters to discover field format
+    const convertedParameters = apdexDefinition.parameters.map<AggregateParameter>(
+      param => {
+        if (param.kind === 'value') {
+          return {
+            kind: 'value' as const,
+            dataType: param.dataType as 'number',
+            required: param.required,
+            defaultValue: param.defaultValue,
+            placeholder: param.placeholder,
+          };
+        }
+        return {
+          kind: 'column' as const,
+          columnTypes: Array.isArray(param.columnTypes)
+            ? param.columnTypes
+            : [param.columnTypes],
+          required: param.required,
+          defaultValue: param.defaultValue,
+        };
+      }
+    );
+
+    base['function:apdex'] = {
+      label: 'apdex',
+      value: {
+        kind: FieldValueKind.FUNCTION,
+        meta: {
+          name: 'apdex',
+          parameters: convertedParameters,
+        },
+      },
+    };
+  }
+
+  return base;
+}
+
 export const DetectorSpansConfig: DetectorDatasetConfig<SpansSeriesResponse> = {
   name: t('Spans'),
   SearchBar: TraceSearchBar,
   defaultEventTypes: DEFAULT_EVENT_TYPES,
   defaultField: SpansConfig.defaultField,
-  getAggregateOptions: SpansConfig.getTableFieldOptions,
+  getAggregateOptions,
   getSeriesQueryOptions: options => {
     return getDiscoverSeriesQueryOptions({
       ...options,
diff --git a/static/app/views/detectors/edit.spec.tsx b/static/app/views/detectors/edit.spec.tsx
index c9866b519b4d4a..363ad4938ab2c8 100644
--- a/static/app/views/detectors/edit.spec.tsx
+++ b/static/app/views/detectors/edit.spec.tsx
@@ -571,7 +571,7 @@ describe('DetectorEdit', () => {
       expect(screen.queryByText('Dynamic')).not.toBeInTheDocument();
     });
 
-    it('disables column select when spans + count()', async () => {
+    it('limited options when selecting spans + count()', async () => {
       const spansDetector = MetricDetectorFixture({
         dataSources: [
           SnubaQueryDataSourceFixture({
@@ -606,9 +606,14 @@ describe('DetectorEdit', () => {
         await screen.findByRole('link', {name: spansDetector.name})
       ).toBeInTheDocument();
 
-      // Column parameter should be locked to "spans" and disabled
+      // Column parameter should be locked to "spans" - verify only "spans" option is available
       const button = screen.getByRole('button', {name: 'spans'});
-      expect(button).toBeDisabled();
+      await userEvent.click(button);
+
+      // Verify only "spans" option exists in the dropdown
+      const options = screen.getAllByRole('option');
+      expect(options).toHaveLength(1);
+      expect(options[0]).toHaveTextContent('spans');
     });
 
     it('resets 1 day interval to 15 minutes when switching to dynamic detection', async () => {
diff --git a/static/app/views/detectors/new-setting.spec.tsx b/static/app/views/detectors/new-setting.spec.tsx
index 69a4b52da0f91c..11b25926a17470 100644
--- a/static/app/views/detectors/new-setting.spec.tsx
+++ b/static/app/views/detectors/new-setting.spec.tsx
@@ -658,6 +658,83 @@ describe('DetectorEdit', () => {
         );
       });
     });
+
+    it('can submit a new metric detector with apdex aggregate', async () => {
+      const mockCreateDetector = MockApiClient.addMockResponse({
+        url: `/organizations/${organization.slug}/detectors/`,
+        method: 'POST',
+        body: MetricDetectorFixture({id: '789'}),
+      });
+
+      render(<DetectorNewSettings />, {
+        organization,
+        initialRouterConfig: metricRouterConfig,
+      });
+
+      const title = await screen.findByText('New Monitor');
+      await userEvent.click(title);
+      await userEvent.keyboard('Apdex{enter}');
+
+      // Change aggregate from count to apdex
+      await userEvent.click(screen.getByRole('button', {name: 'count'}));
+      await userEvent.click(await screen.findByRole('option', {name: 'apdex'}));
+
+      // Change to apdex(100)
+      await userEvent.clear(screen.getByPlaceholderText('300'));
+      await userEvent.type(screen.getByPlaceholderText('300'), '100');
+
+      // Set the high threshold for alerting
+      await userEvent.type(
+        screen.getByRole('spinbutton', {name: 'High threshold'}),
+        '100'
+      );
+
+      await userEvent.click(screen.getByRole('button', {name: 'Create Monitor'}));
+
+      await waitFor(() => {
+        expect(mockCreateDetector).toHaveBeenCalledWith(
+          `/organizations/${organization.slug}/detectors/`,
+          expect.objectContaining({
+            data: expect.objectContaining({
+              name: 'Apdex',
+              type: 'metric_issue',
+              projectId: project.id,
+              owner: null,
+              workflowIds: [],
+              conditionGroup: {
+                conditions: [
+                  {
+                    comparison: 100,
+                    conditionResult: 75,
+                    type: 'gt',
+                  },
+                  {
+                    comparison: 100,
+                    conditionResult: 0,
+                    type: 'lte',
+                  },
+                ],
+                logicType: 'any',
+              },
+              config: {
+                detectionType: 'static',
+              },
+              dataSources: [
+                {
+                  aggregate: 'apdex(span.duration,100)',
+                  dataset: 'events_analytics_platform',
+                  eventTypes: ['trace_item_span'],
+                  query: '',
+                  queryType: 1,
+                  timeWindow: 3600,
+                  environment: null,
+                },
+              ],
+            }),
+          })
+        );
+      });
+    });
   });
 
   describe('Uptime Detector', () => {