diff --git a/lang_qc/db/helper/qc.py b/lang_qc/db/helper/qc.py
index fd635ce..4ddd329 100644
--- a/lang_qc/db/helper/qc.py
+++ b/lang_qc/db/helper/qc.py
@@ -20,7 +20,7 @@
 # this program. If not, see <http://www.gnu.org/licenses/>.
 
 from collections import defaultdict
-from datetime import datetime
+from datetime import date, datetime, timedelta
 
 from sqlalchemy import and_, func, select
 from sqlalchemy.exc import NoResultFound
@@ -105,6 +105,62 @@ def get_qc_states_by_id_product_list(
     return dict(response)
 
 
+def get_qc_states(
+    session: Session,
+    num_weeks: int,
+    sequencing_outcomes_only: bool = False,
+    final_only: bool = False,
+) -> dict[ChecksumSHA256, list[QcState]]:
+    """
+    Returns a dictionary where keys are the product IDs, and the values are
+    lists of QcState records of any type for the same product.
+
+    The num_weeks argument limits the look-back time window.
+
+    If only sequencing type QC states are required, an optional
+    argument, sequencing_outcomes_only, should be set to True.
+    In this case it is guaranteed that the list of QcState objects
+    has only one member.
+
+    If only final QC states are required, an optional argument final_only
+    should be set to True.
+    """
+
+    if num_weeks < 1:
+        raise ValueError("num_weeks should be a positive number")
+
+    query = (
+        select(QcStateDb)
+        .join(QcStateDb.seq_product)
+        .join(QcType)
+        .join(QcStateDict)
+        .join(User)
+        .where(QcStateDb.date_updated > date.today() - timedelta(weeks=num_weeks))
+        .options(
+            selectinload(QcStateDb.seq_product),
+            selectinload(QcStateDb.qc_type),
+            selectinload(QcStateDb.user),
+            selectinload(QcStateDb.qc_state_dict),
+        )
+    )
+    if sequencing_outcomes_only is True:
+        query = query.where(QcType.qc_type == SEQUENCING_QC_TYPE)
+    if final_only is True:
+        query = query.where(QcStateDb.is_preliminary == 0)
+
+    qc_states_dict = dict()
+    for qc_state in [
+        QcState.from_orm(row) for row in session.execute(query).scalars().all()
+    ]:
+        id = qc_state.id_product
+        if id in qc_states_dict:
+            qc_states_dict[id].append(qc_state)
+        else:
+            qc_states_dict[id] = [qc_state]
+
+    return qc_states_dict
+
+
 def product_has_qc_state(
     session: Session, id_product: ChecksumSHA256, qc_type: str = None
 ) -> bool:
diff --git a/lang_qc/endpoints/product.py b/lang_qc/endpoints/product.py
index d780555..4abcb5a 100644
--- a/lang_qc/endpoints/product.py
+++ b/lang_qc/endpoints/product.py
@@ -18,15 +18,19 @@
 # You should have received a copy of the GNU General Public License along with
 # this program. If not, see <http://www.gnu.org/licenses/>.
 
-from fastapi import APIRouter, Depends
+from typing import Annotated
+
+from fastapi import APIRouter, Depends, Query
 from sqlalchemy.orm import Session
 from starlette import status
 
-from lang_qc.db.helper.qc import get_qc_states_by_id_product_list
+from lang_qc.db.helper.qc import get_qc_states, get_qc_states_by_id_product_list
 from lang_qc.db.qc_connection import get_qc_db
 from lang_qc.models.qc_state import QcState
 from lang_qc.util.type_checksum import ChecksumSHA256
 
+RECENTLY_QCED_NUM_WEEKS = 4
+
 router = APIRouter(
     prefix="/products",
     tags=["product"],
@@ -62,3 +66,39 @@ def bulk_qc_fetch(
 ):
 
     return get_qc_states_by_id_product_list(session=qcdb_session, ids=request_body)
+
+
+@router.get(
+    "/qc",
+    summary="Returns a dictionary of QC states",
+    description="""
+    The response is a dictionary of lists of QcState models hashed on product IDs.
+    Multiple QC states for the same product might be returned if the query is not
+    constrained to a single QC type.
+
+    Query parameters constrain the semantics of the response.
+        `weeks`  - number of weeks to look back, defaults to four.
+        `seq_level` - a boolean option. If `True`, only `sequencing` type QC states
+            are returned. If `False` (the default), all types of QC states are
+            returned.
+        `final` - a boolean option. If `True`, only final QC states are returned.
+            If `False` (the default), both final and preliminary QC states are
+            returned.
+    """,
+    responses={
+        status.HTTP_422_UNPROCESSABLE_ENTITY: {"description": "Invalid number of weeks"}
+    },
+    response_model=dict[ChecksumSHA256, list[QcState]],
+)
+def qc_fetch(
+    weeks: Annotated[int, Query(gt=0)] = RECENTLY_QCED_NUM_WEEKS,
+    seq_level: bool = False,
+    final: bool = False,
+    qcdb_session: Session = Depends(get_qc_db),
+) -> dict[ChecksumSHA256, list[QcState]]:
+    return get_qc_states(
+        session=qcdb_session,
+        num_weeks=weeks,
+        sequencing_outcomes_only=seq_level,
+        final_only=final,
+    )
diff --git a/tests/endpoints/test_dump_qc_states.py b/tests/endpoints/test_dump_qc_states.py
index 49247ee..6fef2d5 100644
--- a/tests/endpoints/test_dump_qc_states.py
+++ b/tests/endpoints/test_dump_qc_states.py
@@ -1,3 +1,6 @@
+from datetime import datetime
+
+import pytest
 from fastapi.testclient import TestClient
 
 from tests.fixtures.well_data import load_data4well_retrieval, load_dicts_and_users
@@ -57,3 +60,52 @@ def test_get_qc_by_product_id(test_client: TestClient, load_data4well_retrieval)
     assert len(response_data) == 1
     assert MISSING_CHECKSUM not in response_data
     assert FIRST_GOOD_CHECKSUM in response_data
+
+
+def test_get_qc(test_client: TestClient, load_data4well_retrieval):
+
+    response = test_client.get("/products/qc")
+    assert response.status_code == 200
+    response_data = response.json()
+    assert len(response_data) == 0
+
+    response = test_client.get("/products/qc?weeks=-1")
+    assert response.status_code == 422
+
+    # Earliest test QC states are updated on 2022-02-15
+    interval = datetime.today() - datetime(year=2022, month=2, day=15)
+    num_weeks = int(interval.days / 7 + 2)
+
+    response = test_client.get(f"/products/qc?weeks={num_weeks}")
+    assert response.status_code == 200
+    response_data = response.json()
+    assert len(response_data) == 18
+    assert sum([len(l) for (id, l) in response_data.items()]) == 34
+
+    response = test_client.get(
+        f"/products/qc?weeks={num_weeks}&final=false&seq_level=no"
+    )
+    assert response.status_code == 200
+    response_data = response.json()
+    assert len(response_data) == 18
+    assert sum([len(l) for (id, l) in response_data.items()]) == 34
+
+    response = test_client.get(f"/products/qc?weeks={num_weeks}&final=true")
+    assert response.status_code == 200
+    response_data = response.json()
+    assert len(response_data) == 4
+    assert sum([len(l) for (id, l) in response_data.items()]) == 8
+
+    response = test_client.get(
+        f"/products/qc?weeks={num_weeks}&final=True&seq_level=yes"
+    )
+    assert response.status_code == 200
+    response_data = response.json()
+    assert len(response_data) == 4
+    assert sum([len(l) for (id, l) in response_data.items()]) == 4
+    product_id = "5e91b9246b30c2df4e9f2a2313ce097e93493b0a822e9d9338e32df5d58db585"
+    assert product_id in response_data
+    qc_state = response_data[product_id][0]
+    assert qc_state["id_product"] == product_id
+    assert qc_state["is_preliminary"] is False
+    assert qc_state["qc_type"] == "sequencing"
diff --git a/tests/test_qc_state_retrieval.py b/tests/test_qc_state_retrieval.py
index 6d5813e..505d80b 100644
--- a/tests/test_qc_state_retrieval.py
+++ b/tests/test_qc_state_retrieval.py
@@ -1,12 +1,18 @@
+from datetime import datetime, timedelta
+
 import pytest
+from sqlalchemy import select
 
 from lang_qc.db.helper.qc import (
     get_qc_state_for_product,
+    get_qc_states,
     get_qc_states_by_id_product_list,
     product_has_qc_state,
     products_have_qc_state,
     qc_state_dict,
 )
+from lang_qc.db.qc_schema import QcState
+from lang_qc.models.qc_state import QcState as QcStateModel
 from tests.fixtures.well_data import load_data4well_retrieval, load_dicts_and_users
 
 MISSING_CHECKSUM = "A" * 64
@@ -24,7 +30,7 @@
 two_good_ids_list = [FIRST_GOOD_CHECKSUM, SECOND_GOOD_CHECKSUM]
 
 
-def test_bulk_retrieval(qcdb_test_session, load_data4well_retrieval):
+def test_bulk_retrieval_by_id(qcdb_test_session, load_data4well_retrieval):
 
     # The test below demonstrates that no run-time type checking of
     # product IDs is performed.
@@ -66,6 +72,111 @@ def test_bulk_retrieval(qcdb_test_session, load_data4well_retrieval):
     assert MISSING_CHECKSUM not in qc_states
 
 
+def test_bulk_retrieval(qcdb_test_session, load_data4well_retrieval):
+
+    with pytest.raises(ValueError, match=r"num_weeks should be a positive number"):
+        assert get_qc_states(qcdb_test_session, num_weeks=-1)
+
+    qc_states = (
+        qcdb_test_session.execute(select(QcState).order_by(QcState.date_updated.desc()))
+        .scalars()
+        .all()
+    )
+    now = datetime.today()
+    max_interval = now - qc_states[-1].date_updated
+    max_num_weeks = int(max_interval.days / 7 + 1)
+    min_interval = now - qc_states[0].date_updated
+    min_num_weeks = int(min_interval.days / 7 - 1)
+
+    assert min_num_weeks > 2
+    # Set the look-back number of weeks to teh period with no records.
+    qc_states_dict = get_qc_states(qcdb_test_session, num_weeks=(min_num_weeks - 1))
+    assert len(qc_states_dict) == 0
+
+    # Retrieve all available QC states.
+    qc_states_dict = get_qc_states(qcdb_test_session, num_weeks=max_num_weeks)
+    # Test total number of QcState objects.
+    assert sum([len(l) for (id, l) in qc_states_dict.items()]) == len(qc_states)
+    # Test number of items in the dictionary.
+    assert len(qc_states_dict) == len(
+        {qc_state.id_seq_product: 1 for qc_state in qc_states}
+    )
+
+    # Retrieve all available final QC states.
+    qc_states_dict = get_qc_states(
+        qcdb_test_session, num_weeks=max_num_weeks, final_only=True
+    )
+    assert sum([len(l) for (id, l) in qc_states_dict.items()]) == len(
+        [qc_state for qc_state in qc_states if qc_state.is_preliminary == 0]
+    )
+    assert {id: len(l) for (id, l) in qc_states_dict.items()} == {
+        "e47765a207c810c2c281d5847e18c3015f3753b18bd92e8a2bea1219ba3127ea": 2,
+        "977089cd272dffa70c808d74159981c0d1363840875452a868a4c5e15f1b2072": 2,
+        "dc99ab8cb6762df5c935adaeb1f0c49ff34af96b6fa3ebf9a90443079c389579": 2,
+        "5e91b9246b30c2df4e9f2a2313ce097e93493b0a822e9d9338e32df5d58db585": 2,
+    }
+
+    # Retrieve all available sequencing type QC states.
+    qc_states_dict = get_qc_states(
+        qcdb_test_session, num_weeks=max_num_weeks, sequencing_outcomes_only=True
+    )
+    assert len(qc_states_dict) == len(
+        [qc_state for qc_state in qc_states if qc_state.qc_type.qc_type == "sequencing"]
+    )
+
+    # Retrieve all available sequencing type final QC states.
+    qc_states_dict = get_qc_states(
+        qcdb_test_session,
+        num_weeks=max_num_weeks,
+        final_only=True,
+        sequencing_outcomes_only=True,
+    )
+    assert len(qc_states_dict) == len(
+        [
+            qc_state
+            for qc_state in qc_states
+            if (
+                qc_state.is_preliminary == 0
+                and qc_state.qc_type.qc_type == "sequencing"
+            )
+        ]
+    )
+    assert {id: len(l) for (id, l) in qc_states_dict.items()} == {
+        "e47765a207c810c2c281d5847e18c3015f3753b18bd92e8a2bea1219ba3127ea": 1,
+        "977089cd272dffa70c808d74159981c0d1363840875452a868a4c5e15f1b2072": 1,
+        "dc99ab8cb6762df5c935adaeb1f0c49ff34af96b6fa3ebf9a90443079c389579": 1,
+        "5e91b9246b30c2df4e9f2a2313ce097e93493b0a822e9d9338e32df5d58db585": 1,
+    }
+
+    # Retrieve recent sequencing type final QC states.
+    num_weeks = max_num_weeks - 44
+    qc_states_dict = get_qc_states(
+        qcdb_test_session,
+        num_weeks=num_weeks,
+        final_only=True,
+        sequencing_outcomes_only=True,
+    )
+    earliest_time = now - timedelta(weeks=num_weeks)
+    assert len(qc_states_dict) == len(
+        [
+            qc_state
+            for qc_state in qc_states
+            if (
+                qc_state.date_updated > earliest_time
+                and qc_state.is_preliminary == 0
+                and qc_state.qc_type.qc_type == "sequencing"
+            )
+        ]
+    )
+    product_id = "5e91b9246b30c2df4e9f2a2313ce097e93493b0a822e9d9338e32df5d58db585"
+    assert {id: len(l) for (id, l) in qc_states_dict.items()} == {product_id: 1}
+    qc_state = qc_states_dict[product_id][0]
+    assert isinstance(qc_state, QcStateModel)
+    assert qc_state.id_product == product_id
+    assert qc_state.is_preliminary is False
+    assert qc_state.qc_type == "sequencing"
+
+
 def test_product_existence(qcdb_test_session, load_data4well_retrieval):
 
     assert product_has_qc_state(qcdb_test_session, MISSING_CHECKSUM) is False