diff --git a/kf_lib_data_ingest/common/concept_schema.py b/kf_lib_data_ingest/common/concept_schema.py
index ed35de1a..82568c92 100644
--- a/kf_lib_data_ingest/common/concept_schema.py
+++ b/kf_lib_data_ingest/common/concept_schema.py
@@ -173,7 +173,11 @@ class SAMPLE(PropertyMixin):
         class EVENT_AGE(QuantityMixin):
             pass
 
+        class QUANTITY(QuantityMixin):
+            pass
+
         class VOLUME(QuantityMixin):
+            # Keeping for backwards compatability. Use QUANTITY instead.
             pass
 
         SPATIAL_DESCRIPTOR = None
@@ -186,8 +190,6 @@ class VOLUME(QuantityMixin):
         EXTERNAL_COLLECTION_ID = None
 
     class BIOSPECIMEN(SAMPLE):
-        class QUANTITY(QuantityMixin):
-            pass
 
         class CONCENTRATION(QuantityMixin):
             pass
diff --git a/kf_lib_data_ingest/target_api_plugins/kids_first_dataservice.py b/kf_lib_data_ingest/target_api_plugins/kids_first_dataservice.py
index 43a633d2..6903630a 100644
--- a/kf_lib_data_ingest/target_api_plugins/kids_first_dataservice.py
+++ b/kf_lib_data_ingest/target_api_plugins/kids_first_dataservice.py
@@ -503,6 +503,14 @@ def build_entity(cls, record, get_target_id_from_record):
                 record.get(CONCEPT.SAMPLE.VOLUME_UL)
                 or record.get(CONCEPT.BIOSPECIMEN.VOLUME_UL)
             ),
+            "amount": (
+                record.get(CONCEPT.SAMPLE.QUANTITY.VALUE)
+                or record.get(CONCEPT.BIOSPECIMEN.QUANTITY.VALUE)
+            ),
+            "amount_units": (
+                record.get(CONCEPT.SAMPLE.QUANTITY.UNITS)
+                or record.get(CONCEPT.BIOSPECIMEN.QUANTITY.UNITS)
+            ),
         }
         return {
             **cls.get_key_components(record, get_target_id_from_record),
@@ -689,6 +697,14 @@ def build_entity(cls, record, get_target_id_from_record):
                 record.get(CONCEPT.SAMPLE.VOLUME_UL)
                 or record.get(CONCEPT.BIOSPECIMEN.VOLUME_UL)
             ),
+            "amount": (
+                record.get(CONCEPT.SAMPLE.QUANTITY.VALUE)
+                or record.get(CONCEPT.BIOSPECIMEN.QUANTITY.VALUE)
+            ),
+            "amount_units": (
+                record.get(CONCEPT.SAMPLE.QUANTITY.UNITS)
+                or record.get(CONCEPT.BIOSPECIMEN.QUANTITY.UNITS)
+            ),
             "specimen_status": (record.get(CONCEPT.BIOSPECIMEN.STATUS)),
             "visible": record.get(CONCEPT.BIOSPECIMEN.VISIBLE),
             "visibility_comment": record.get(