diff --git a/check_iperf3.py b/check_iperf3.py
index ebdf20d..078a238 100755
--- a/check_iperf3.py
+++ b/check_iperf3.py
@@ -166,8 +166,10 @@ def determine_result(options, json_data) -> Tuple[int, Optional[List[str]]]:
     Args:
         options: An object with threshold attributes used for evaluation.
             Expected attributes include:
-            - rate_warn (int): Warning threshold for bits per second.
-            - rate_crit (int): Critical threshold for bits per second.
+            - rate_up_warn (int): Warning threshold for upstream rate in bits per second.
+            - rate_up_crit (int): Critical threshold for upstream rate in bits per second.
+            - rate_down_warn (int): Warning threshold for downstream rate in bits per second.
+            - rate_down_crit (int): Critical threshold for downstream rate in bits per second.
             - retrans_warn (int): Warning threshold for retransmissions (TCP only).
             - retrans_crit (int): Critical threshold for retransmissions (TCP only).
             - udp (bool): Whether the test was run over UDP (retransmissions are ignored if True).
@@ -188,13 +190,27 @@ def determine_result(options, json_data) -> Tuple[int, Optional[List[str]]]:
     if "error" in json_data:
         nagexit(3, json_data["error"])
 
-    if options.rate_crit and options.rate_warn:
-        if json_data["end"]["sum_sent"]["bits_per_second"] <= options.rate_crit:
+    json_end = json_data['end']
+
+    bps_avg_up = json_end['sum_sent']['bits_per_second'] if options.bidir or not options.downstream else None
+    bps_avg_down = json_end['sum_sent_bidir_reverse']['bits_per_second'] if options.bidir else \
+        json_data['end']['sum_sent']['bits_per_second'] if options.downstream else None
+
+    if bps_avg_up is not None:
+        if options.rate_up_crit and bps_avg_up <= options.rate_up_crit:
             rc = max(rc, 2)
-            statuslines.append("transfer rate below critical threshold")
-        elif json_data["end"]["sum_sent"]["bits_per_second"] <= options.rate_warn:
+            statuslines.append("upstream rate below critical threshold")
+        elif options.rate_up_warn and bps_avg_up <= options.rate_up_warn:
             rc = max(rc, 1)
-            statuslines.append("transfer rate below warning threshold")
+            statuslines.append("upstream rate below warning threshold")
+
+    if bps_avg_down is not None:
+        if options.rate_down_crit and bps_avg_down <= options.rate_down_crit:
+            rc = max(rc, 2)
+            statuslines.append("downpstream rate below critical threshold")
+        elif options.rate_down_warn and bps_avg_down <= options.rate_down_warn:
+            rc = max(rc, 1)
+            statuslines.append("downstream rate below warning threshold")
 
     if not options.udp and options.retrans_crit and options.retrans_warn:
         retransmits = json_data["end"]["sum_sent"]["retransmits"]
@@ -288,8 +304,10 @@ def build_perfdata(options, json_data: dict) -> List[str]:
             - bidir (bool): Whether the test was bidirectional.
             - downstream (bool): Whether to use reverse (download) direction.
             - udp (bool): Whether the test used UDP (retransmissions ignored).
-            - rate_warn (int): Warning threshold for throughput (in bits/sec).
-            - rate_crit (int): Critical threshold for throughput.
+            - rate_up_warn (int): Warning threshold for upstream rate in bits per second.
+            - rate_up_crit (int): Critical threshold for upstream rate in bits per second.
+            - rate_down_warn (int): Warning threshold for downstream rate in bits per second.
+            - rate_down_crit (int): Critical threshold for downstream rate in bits per second.
             - retrans_warn (int): Warning threshold for retransmissions (TCP only).
             - retrans_crit (int): Critical threshold for retransmissions.
         json_data (dict): Parsed iperf3 output containing measurement results.
@@ -315,10 +333,10 @@ def build_perfdata(options, json_data: dict) -> List[str]:
 
     if bps_avg_up is not None:
         perfdata.append(build_single_perfdata("bps_avg_up", bits_per_second(
-            bps_avg_up), options.rate_warn, options.rate_crit))
+            bps_avg_up), options.rate_up_warn, options.rate_up_crit))
     if bps_avg_down is not None:
         perfdata.append(build_single_perfdata("bps_avg_down", bits_per_second(
-            bps_avg_down), options.rate_warn, options.rate_crit))
+            bps_avg_down), options.rate_down_warn, options.rate_down_crit))
 
     if not options.udp:
         if retrans_sum_up is not None:
@@ -351,8 +369,10 @@ def check_iperf3(options):
             - bidir (bool): Whether the test should be bidirectional.
             - downstream (bool): Whether the test should use reverse mode (server to client).
             - udp (bool): Whether the test should use UDP instead of TCP.
-            - rate_warn (int): Warning threshold for throughput (in bits/sec).
-            - rate_crit (int): Critical threshold for throughput.
+            - rate_up_warn (int): Warning threshold for upstream rate in bits per second.
+            - rate_up_crit (int): Critical threshold for upstream rate in bits per second.
+            - rate_down_warn (int): Warning threshold for downstream rate in bits per second.
+            - rate_down_crit (int): Critical threshold for downstream rate in bits per second.
             - retrans_warn (int): Warning threshold for retransmissions (TCP only).
             - retrans_crit (int): Critical threshold for retransmissions (TCP only).
             - bytes (str): Optional. Data to transfer (e.g., '10M').
@@ -384,6 +404,18 @@ if __name__ == "__main__":
     thres_opts.add_option("-c", "--rate-critical", dest="rate_crit",
                           type="int", metavar="BITS", action="store",
                           help="Defines the transfer rate's critical threshold")
+    thres_opts.add_option("--rate-up-warning", dest="rate_up_warn",
+                          type="int", metavar="BITS", action="store",
+                          help="Defines the upstream rate's warning threshold")
+    thres_opts.add_option("--rate-up-critical", dest="rate_up_crit",
+                          type="int", metavar="BITS", action="store",
+                          help="Defines the upstream rate's critical threshold")
+    thres_opts.add_option("--rate-down-warning", dest="rate_down_warn",
+                          type="int", metavar="BITS", action="store",
+                          help="Defines the downstream rate's warning threshold")
+    thres_opts.add_option("--rate-down-critical", dest="rate_down_crit",
+                          type="int", metavar="BITS", action="store",
+                          help="Defines the downstream rate's critical threshold")
 
     # retransmits
     thres_opts.add_option("-W", "--retransmit-warning", dest="retrans_warn",
@@ -432,6 +464,14 @@ if __name__ == "__main__":
     if not opts.remote or opts.time <= 0:
         parser.print_help()
         sys.exit(3)
+    if not opts.rate_up_warn:
+        opts.rate_up_warn = opts.rate_warn
+    if not opts.rate_down_warn:
+        opts.rate_down_warn = opts.rate_warn
+    if not opts.rate_up_crit:
+        opts.rate_up_crit = opts.rate_crit
+    if not opts.rate_down_crit:
+        opts.rate_down_crit = opts.rate_crit
 
     check_iperf3(opts)
 
diff --git a/command_check_iperf3.conf b/command_check_iperf3.conf
index 08a10fe..e1b8979 100644
--- a/command_check_iperf3.conf
+++ b/command_check_iperf3.conf
@@ -42,6 +42,22 @@ object CheckCommand "iperf3" {
             description = "defines the transfer rate's critical threshold"
             value = "$check_iperf3_rate_critical$"
         }
+        "--rate-up-warning" = {
+            description = "defines the upstream rate's warning threshold"
+            value = "$check_iperf3_rate_up_warning$"
+        }
+        "--rate-up-critical" = {
+            description = "defines the upstream rate's critical threshold"
+            value = "$check_iperf3_rate_up_critical$"
+        }
+        "--rate-down-warning" = {
+            description = "defines the downstream rate's warning threshold"
+            value = "$check_iperf3_rate_down_warning$"
+        }
+        "--rate-down-critical" = {
+            description = "defines the downstream rate's critical threshold"
+            value = "$check_iperf3_rate_down_critical$"
+        }
         "--retransmission-warning" = {
             description = "defines the transfer retransmission's warning threshold"
             value = "$check_iperf3_retransmission_warning$"