diff --git a/lambda-layer/packages/layer/scripts/otel-instrument b/lambda-layer/packages/layer/scripts/otel-instrument
index 9366295..cdd55dd 100644
--- a/lambda-layer/packages/layer/scripts/otel-instrument
+++ b/lambda-layer/packages/layer/scripts/otel-instrument
@@ -43,9 +43,22 @@ if [ -z "${OTEL_EXPORTER_OTLP_PROTOCOL}" ]; then
     export OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf
 fi
 
-# - If OTEL_NODE_ENABLED_INSTRUMENTATIONS is not set by user, use default instrumentation
-if [ -z "${OTEL_NODE_ENABLED_INSTRUMENTATIONS}" ]; then
-    export OTEL_NODE_ENABLED_INSTRUMENTATIONS="aws-lambda,aws-sdk"
+# If both OTEL_NODE_ENABLED_INSTRUMENTATIONS and OTEL_NODE_DISABLED_INSTRUMENTATIONS are not configured,
+# set OTEL_NODE_ENABLED_INSTRUMENTATIONS="aws-sdk,aws-lambda"
+if [ -z "${OTEL_NODE_ENABLED_INSTRUMENTATIONS}" ] && [ -z "${OTEL_NODE_DISABLED_INSTRUMENTATIONS}" ]; then
+    export OTEL_NODE_ENABLED_INSTRUMENTATIONS="aws-sdk,aws-lambda"
+
+# Else if OTEL_NODE_ENABLED_INSTRUMENTATIONS is configured and OTEL_NODE_DISABLED_INSTRUMENTATIONS is not,
+# append OTEL_NODE_ENABLED_INSTRUMENTATIONS with "aws-lambda"
+elif [ -n "${OTEL_NODE_ENABLED_INSTRUMENTATIONS}" ] && [ -z "${OTEL_NODE_DISABLED_INSTRUMENTATIONS}" ]; then
+    export OTEL_NODE_ENABLED_INSTRUMENTATIONS="${OTEL_NODE_ENABLED_INSTRUMENTATIONS},aws-lambda"
+
+# Else if both OTEL_NODE_ENABLED_INSTRUMENTATIONS and OTEL_NODE_DISABLED_INSTRUMENTATIONS are configured,
+# append OTEL_NODE_ENABLED_INSTRUMENTATIONS with "aws-lambda"
+elif [ -n "${OTEL_NODE_ENABLED_INSTRUMENTATIONS}" ] && [ -n "${OTEL_NODE_DISABLED_INSTRUMENTATIONS}" ]; then
+    export OTEL_NODE_ENABLED_INSTRUMENTATIONS="${OTEL_NODE_ENABLED_INSTRUMENTATIONS},aws-lambda"
+
+# Else do nothing
 fi
 
 # - Set the service name