diff --git a/snprc_scheduler/api-src/org/labkey/api/snprc_scheduler/SNPRC_schedulerService.java b/snprc_scheduler/api-src/org/labkey/api/snprc_scheduler/SNPRC_schedulerService.java
index 035846843..ec3eb7f42 100644
--- a/snprc_scheduler/api-src/org/labkey/api/snprc_scheduler/SNPRC_schedulerService.java
+++ b/snprc_scheduler/api-src/org/labkey/api/snprc_scheduler/SNPRC_schedulerService.java
@@ -27,7 +27,7 @@ static SNPRC_schedulerService get()
     }
 
     List<JSONObject> getActiveTimelines(Container c, User u, String ProjectObjectId, BatchValidationException errors);
-    List<JSONObject> getScheduledTimelinesForSpecies(Container c, User u, String species, Date date, BatchValidationException errors);
+    List<JSONObject> getScheduledTimelinesForSpecies(Container c, User u, String species, Date date, String qcState, BatchValidationException errors);
     List<Map<String, Object>> getActiveProjects(Container c, User u, ArrayList<SimpleFilter> filters, Boolean activeProjectItemsOnly, Date eventDate);
     JSONObject saveTimelineData(Container c, User u, JSONObject json, BatchValidationException errors);
 }
diff --git a/snprc_scheduler/src/org/labkey/snprc_scheduler/SNPRC_schedulerController.java b/snprc_scheduler/src/org/labkey/snprc_scheduler/SNPRC_schedulerController.java
index 711a267ba..51ff7e5c8 100644
--- a/snprc_scheduler/src/org/labkey/snprc_scheduler/SNPRC_schedulerController.java
+++ b/snprc_scheduler/src/org/labkey/snprc_scheduler/SNPRC_schedulerController.java
@@ -118,13 +118,14 @@ public ApiResponse execute(SimpleApiJsonForm form, BindException errors)
                 {
                     species = url.getParameter("species");
                     dateString = url.getParameter("date");
+                    String qcState = url.getParameter("qcState");
 
                      // assume current date if date is not passed in
                     date = (dateString == null ? new Date() : DateUtil.parseDateTime(dateString, Timeline.TIMELINE_DATE_FORMAT));
                     if (species != null && date != null)
                     {
                         timelines = SNPRC_schedulerService.get().getScheduledTimelinesForSpecies(getContainer(), getUser(),
-                                species, date, new BatchValidationException());
+                                species, date, qcState, new BatchValidationException());
 
                         props.put("success", true);
                         props.put("rows", timelines);
diff --git a/snprc_scheduler/src/org/labkey/snprc_scheduler/services/SNPRC_schedulerServiceImpl.java b/snprc_scheduler/src/org/labkey/snprc_scheduler/services/SNPRC_schedulerServiceImpl.java
index c74bb1bfd..8490b3f09 100644
--- a/snprc_scheduler/src/org/labkey/snprc_scheduler/services/SNPRC_schedulerServiceImpl.java
+++ b/snprc_scheduler/src/org/labkey/snprc_scheduler/services/SNPRC_schedulerServiceImpl.java
@@ -25,12 +25,15 @@
 import org.labkey.snprc_scheduler.domains.TimelineAnimalJunction;
 import org.labkey.snprc_scheduler.domains.TimelineItem;
 import org.labkey.snprc_scheduler.domains.TimelineProjectItem;
+import org.labkey.snprc_scheduler.security.QCStateEnum;
 
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.List;
 import java.util.Map;
 
+import static org.apache.commons.lang3.StringUtils.isNotBlank;
+
 /**
  * Created by thawkins on 10/21/2018
  */
@@ -87,9 +90,20 @@ public List<JSONObject> getActiveTimelines(Container c, User u, String projectOb
     }
 
 
-    //TODO: need to add scheduleDate criteria
+    /**
+     * Retrieves timelines for a given species that have procedures scheduled on a specific date.
+     * Optionally filters by QC state.
+     *
+     * @param c       = Container object
+     * @param u       = User object
+     * @param species = species identifier to filter timelines
+     * @param date    = schedule date to match against timeline items
+     * @param qcState = optional QC state name to further filter timelines
+     * @param errors  = exception object for collecting validation errors
+     * @return list of timeline JSON objects matching the criteria
+     */
     @Override
-    public List<JSONObject> getScheduledTimelinesForSpecies(Container c, User u, String species, Date date, BatchValidationException errors) throws ApiUsageException
+    public List<JSONObject> getScheduledTimelinesForSpecies(Container c, User u, String species, Date date, String qcState, BatchValidationException errors) throws ApiUsageException
     {
         List<JSONObject> timelinesJson = new ArrayList<>();
         try
@@ -97,7 +111,7 @@ public List<JSONObject> getScheduledTimelinesForSpecies(Container c, User u, Str
             SNPRC_schedulerUserSchema schema = SNPRC_schedulerManager.getSNPRC_schedulerUserSchema(c, u);
             TableInfo timelineTable = schema.getTable(SNPRC_schedulerSchema.TABLE_NAME_TIMELINE, schema.getDefaultContainerFilter(), false, false);
 
-            // only return timelines with procedures scheduled on specified date
+            // Query for timeline ObjectIds that have items scheduled on the given date
             SQLFragment sql = new SQLFragment();
             sql.append("SELECT DISTINCT t." + Timeline.TIMELINE_OBJECTID);
             sql.append(" FROM ");
@@ -105,19 +119,30 @@ public List<JSONObject> getScheduledTimelinesForSpecies(Container c, User u, Str
             sql.append(" JOIN ");
             sql.append(SNPRC_schedulerSchema.getInstance().getTableInfoTimelineItem(), "ti");
             sql.append(" ON t." + Timeline.TIMELINE_OBJECTID + " = ti." + TimelineItem.TIMELINEITEM_TIMELINE_OBJECT_ID);
-            sql.append(" WHERE " + "ti." + TimelineItem.TIMELINEITEM_SCHEDULE_DATE  + " = ?" ).add(date);
+            sql.append(" WHERE ti." + TimelineItem.TIMELINEITEM_SCHEDULE_DATE + " = ?").add(date);
 
             SqlSelector selector = new SqlSelector(SNPRC_schedulerSchema.getInstance().getSchema(), sql);
 
             List<String> objectIds = new ArrayList<>();
             selector.forEachMap(row -> objectIds.add( (String) row.get(Timeline.TIMELINE_OBJECTID)));
 
-            //SimpleFilter filter = new SimpleFilter(FieldKey.fromParts(Timeline.TIMELINE_SPECIES, "referenceId", "species"), species, CompareType.EQUAL);
+            // Build filter for species, matching ObjectIds, and optional QC state
             SimpleFilter filter = new SimpleFilter(FieldKey.fromParts("sndProject", "referenceId", "species"), species, CompareType.EQUAL);
-            filter.addInClause(FieldKey.fromParts(Timeline.TIMELINE_OBJECTID), objectIds );
+            filter.addInClause(FieldKey.fromParts(Timeline.TIMELINE_OBJECTID), objectIds);
+
+            if (isNotBlank(qcState))
+            {
+                Integer qcStateId = QCStateEnum.getQCStateEnumId(c, u,
+                    QCStateEnum.getQCStateEnumByName(qcState));
+                if (qcStateId != null)
+                {
+                    filter.addCondition(FieldKey.fromParts(Timeline.TIMELINE_QCSTATE), qcStateId, CompareType.EQUAL);
+                }
+            }
 
             List<Timeline> timelines = new TableSelector(timelineTable, filter, null).getArrayList(Timeline.class);
 
+            // Populate nested collections for each timeline and convert to JSON
             for (Timeline timeline : timelines)
             {
                 timeline.setTimelineItems(SNPRC_schedulerManager.get().getTimelineItems(c, u, timeline.getObjectId(), date));