diff --git a/log/fields_trace.go b/log/fields_trace.go
index 0691d04..3c527af 100644
--- a/log/fields_trace.go
+++ b/log/fields_trace.go
@@ -5,9 +5,14 @@ import (
 )
 
 const (
+	SpanID  = "span_id"
 	TraceID = "trace_id"
 )
 
+func FSpanID(traceID string) zap.Field {
+	return zap.String(SpanID, traceID)
+}
+
 func FTraceID(traceID string) zap.Field {
 	return zap.String(TraceID, traceID)
 }
diff --git a/log/with.go b/log/with.go
index 7dd231a..ed236ef 100644
--- a/log/with.go
+++ b/log/with.go
@@ -29,8 +29,8 @@ func WithServiceName(l *zap.Logger, name string) *zap.Logger {
 }
 
 func WithTraceID(l *zap.Logger, ctx context.Context) *zap.Logger {
-	if spanCtx := trace.SpanContextFromContext(ctx); spanCtx.IsValid() {
-		l = With(l, FTraceID(spanCtx.TraceID().String()))
+	if spanCtx := trace.SpanContextFromContext(ctx); spanCtx.IsValid() && spanCtx.IsSampled() {
+		l = With(l, FTraceID(spanCtx.TraceID().String()), FSpanID(spanCtx.SpanID().String()))
 	}
 	return l
 }
diff --git a/net/http/middleware/telemetry.go b/net/http/middleware/telemetry.go
index 09c6fee..d293a79 100644
--- a/net/http/middleware/telemetry.go
+++ b/net/http/middleware/telemetry.go
@@ -72,8 +72,9 @@ func TelemetryWithOptions(opts TelemetryOptions) Middleware {
 			}
 
 			if labeler, ok := httplog.LabelerFromRequest(r); ok {
-				if spanCtx := trace.SpanContextFromContext(r.Context()); spanCtx.IsValid() {
+				if spanCtx := trace.SpanContextFromContext(r.Context()); spanCtx.IsValid() && spanCtx.IsSampled() {
 					labeler.Add(log.FTraceID(spanCtx.TraceID().String()))
+					labeler.Add(log.FSpanID(spanCtx.SpanID().String()))
 				}
 			}