diff --git a/src/components/labs/lab-list.tsx b/src/components/labs/lab-list.tsx
index 57b21e729..2f077bee4 100644
--- a/src/components/labs/lab-list.tsx
+++ b/src/components/labs/lab-list.tsx
@@ -211,7 +211,7 @@ export function LabList({ onAddFirst }: { onAddFirst?: () => void } = {}) {
           </p>
         ) : null}
         <Card>
-          <CardContent className="divide-border divide-y p-0">
+          <CardContent className="divide-border grid grid-cols-[minmax(0,1fr)_max-content_12rem_72px_auto] gap-x-3 divide-y p-0">
             {groups.map((group) => {
               const inner = (
                 <div className="min-w-0 flex-1">
@@ -219,10 +219,6 @@ export function LabList({ onAddFirst }: { onAddFirst?: () => void } = {}) {
                     <span className="truncate font-medium">
                       {group.analyte}
                     </span>
-                    <ReferenceRangeBadge
-                      status={group.latest.rangeStatus}
-                      compact
-                    />
                   </div>
                   <div className="text-muted-foreground flex flex-wrap items-center gap-x-2 text-xs">
                     <span className="text-foreground font-semibold tabular-nums">
@@ -233,42 +229,53 @@ export function LabList({ onAddFirst }: { onAddFirst?: () => void } = {}) {
                 </div>
               );
               // The whole row navigates into the detail (where delete lives).
-              return (
+              return group.biomarkerId ? (
+                <Link
+                  key={group.key}
+                  href={`/labs/${group.biomarkerId}`}
+                  className="hover:bg-muted/40 col-span-full grid min-w-0 grid-cols-subgrid items-center px-4 py-2.5 transition-colors"
+                >
+                  {inner}
+                  <ReferenceRangeBadge
+                    status={group.latest.rangeStatus}
+                    compact
+                    className="w-full"
+                  />
+                  <LabRangeBarSlot reading={group.latest} />
+                  <div className="w-[72px]">
+                    <LabTrendSparkline
+                      values={group.readings.map((reading) => reading.value)}
+                      referenceLow={group.latest.referenceLow}
+                      referenceHigh={group.latest.referenceHigh}
+                    />
+                  </div>
+                  <ChevronRight className="text-muted-foreground h-4 w-4 shrink-0" />
+                </Link>
+              ) : (
+                // Un-linked group (not backfilled to a catalog biomarker):
+                // render inert but say so, so it doesn't read as a broken
+                // link next to its clickable neighbours.
                 <div
                   key={group.key}
-                  className="flex items-center justify-between gap-2 px-4 py-2.5"
+                  className="col-span-full grid min-w-0 grid-cols-subgrid items-center px-4 py-2.5"
                 >
-                  {group.biomarkerId ? (
-                    <Link
-                      href={`/labs/${group.biomarkerId}`}
-                      className="hover:bg-muted/40 -m-1 grid min-w-0 flex-1 grid-cols-[minmax(0,1fr)_12rem_72px_auto] items-center gap-3 rounded-md p-1 transition-colors"
-                    >
-                      {inner}
-                      <LabRangeBarSlot reading={group.latest} />
-                      <div className="w-[72px]">
-                        <LabTrendSparkline
-                          values={group.readings.map((r) => r.value)}
-                        />
-                      </div>
-                      <ChevronRight className="text-muted-foreground h-4 w-4 shrink-0" />
-                    </Link>
-                  ) : (
-                    // Un-linked group (not backfilled to a catalog biomarker):
-                    // render inert but say so, so it doesn't read as a broken
-                    // link next to its clickable neighbours.
-                    <div className="grid min-w-0 flex-1 grid-cols-[minmax(0,1fr)_12rem_72px_auto] items-center gap-3">
-                      {inner}
-                      <LabRangeBarSlot reading={group.latest} />
-                      <div className="w-[72px]">
-                        <LabTrendSparkline
-                          values={group.readings.map((r) => r.value)}
-                        />
-                      </div>
-                      <span className="text-muted-foreground shrink-0 text-xs italic">
-                        {t("labs.notLinkedYet")}
-                      </span>
-                    </div>
-                  )}
+                  {inner}
+                  <ReferenceRangeBadge
+                    status={group.latest.rangeStatus}
+                    compact
+                    className="w-full"
+                  />
+                  <LabRangeBarSlot reading={group.latest} />
+                  <div className="w-[72px]">
+                    <LabTrendSparkline
+                      values={group.readings.map((reading) => reading.value)}
+                      referenceLow={group.latest.referenceLow}
+                      referenceHigh={group.latest.referenceHigh}
+                    />
+                  </div>
+                  <span className="text-muted-foreground shrink-0 text-xs italic">
+                    {t("labs.notLinkedYet")}
+                  </span>
                 </div>
               );
             })}
@@ -359,7 +366,9 @@ export function LabList({ onAddFirst }: { onAddFirst?: () => void } = {}) {
                     />
                   </div>
                   <LabTrendSparkline
-                    values={group.readings.map((r) => r.value)}
+                    values={group.readings.map((reading) => reading.value)}
+                    referenceLow={group.latest.referenceLow}
+                    referenceHigh={group.latest.referenceHigh}
                   />
                 </div>
                 {/* Un-linked group: the header renders no link, so name the
diff --git a/src/components/labs/lab-trend-sparkline.tsx b/src/components/labs/lab-trend-sparkline.tsx
index 4633dc400..8d25e767a 100644
--- a/src/components/labs/lab-trend-sparkline.tsx
+++ b/src/components/labs/lab-trend-sparkline.tsx
@@ -13,9 +13,9 @@
  * polyline vs Recharts) is used by the doctor-report PDF. The two are not
  * drift; do not unify them.
  *
- * Rendered only when an analyte has ≥ 2 NUMERIC readings. Stroke uses the
- * neutral `currentColor` so it inherits the calm muted-foreground tone of its
- * row — no status colour, in keeping with the no-alarming-colour ethos.
+ * Rendered only when an analyte has ≥ 2 NUMERIC readings. The calm neutral
+ * line preserves the compact graph, while each reading uses the adjacent
+ * reference-range bar's semantic colour.
  *
  * `values` are passed oldest → newest. v1.18.9 — qualitative readings carry no
  * number (`null`); they are filtered out here so a series with qualitative
@@ -23,10 +23,14 @@
  */
 export function LabTrendSparkline({
   values: rawValues,
+  referenceLow = null,
+  referenceHigh = null,
   width = 72,
   height = 20,
 }: {
   values: (number | null)[];
+  referenceLow?: number | null;
+  referenceHigh?: number | null;
   width?: number;
   height?: number;
 }) {
@@ -40,32 +44,62 @@ export function LabTrendSparkline({
   const pad = 2;
   const usableH = height - pad * 2;
 
-  const points = values
-    .map((v, i) => {
-      const x = i * stepX;
-      // Invert Y so a higher value sits higher on screen.
-      const y = pad + usableH - ((v - min) / span) * usableH;
-      return `${x.toFixed(1)},${y.toFixed(1)}`;
-    })
+  const points = values.map((v, i) => {
+    const x = i * stepX;
+    // Invert Y so a higher value sits higher on screen.
+    const y = pad + usableH - ((v - min) / span) * usableH;
+    return { value: v, x, y };
+  });
+  const polylinePoints = points
+    .map(({ x, y }) => `${x.toFixed(1)},${y.toFixed(1)}`)
     .join(" ");
+  const isValidRange =
+    referenceLow !== null &&
+    referenceHigh !== null &&
+    referenceLow < referenceHigh;
+  const pointClassName = (value: number) => {
+    if (isValidRange) {
+      if (value < referenceLow) return "fill-info";
+      if (value > referenceHigh) return "fill-warning";
+      return "fill-success";
+    }
+    if (referenceLow !== null) {
+      return value < referenceLow ? "fill-info" : "fill-success";
+    }
+    if (referenceHigh !== null) {
+      return value > referenceHigh ? "fill-warning" : "fill-success";
+    }
+    return "fill-muted-foreground";
+  };
 
   return (
     <svg
       width={width}
       height={height}
       viewBox={`0 0 ${width} ${height}`}
-      className="text-muted-foreground overflow-visible"
+      className="overflow-visible"
       aria-hidden
       role="presentation"
     >
       <polyline
-        points={points}
+        points={polylinePoints}
         fill="none"
-        stroke="currentColor"
-        strokeWidth={1.25}
+        className="stroke-muted-foreground"
+        strokeWidth={2}
         strokeLinejoin="round"
         strokeLinecap="round"
       />
+      {points.map(({ value, x, y }, index) => (
+        <rect
+          key={index}
+          x={x - 2}
+          y={y - 4}
+          width={4}
+          height={8}
+          rx={1}
+          className={pointClassName(value)}
+        />
+      ))}
     </svg>
   );
 }
diff --git a/src/components/labs/reference-range-badge.tsx b/src/components/labs/reference-range-badge.tsx
index d48cad65a..4e59c1a8a 100644
--- a/src/components/labs/reference-range-badge.tsx
+++ b/src/components/labs/reference-range-badge.tsx
@@ -4,6 +4,7 @@ import { ArrowDown, ArrowUp, Minus } from "lucide-react";
 
 import { Badge } from "@/components/ui/badge";
 import { useTranslations } from "@/lib/i18n/context";
+import { cn } from "@/lib/utils";
 import type { ReferenceRangeStatus } from "@/lib/validations/labs";
 
 /**
@@ -23,6 +24,7 @@ import type { ReferenceRangeStatus } from "@/lib/validations/labs";
 export function ReferenceRangeBadge({
   status,
   compact = false,
+  className,
 }: {
   status: ReferenceRangeStatus;
   /**
@@ -31,6 +33,7 @@ export function ReferenceRangeBadge({
    * The hero/detail view keeps the default (un-compact) size.
    */
   compact?: boolean;
+  className?: string;
 }) {
   const { t } = useTranslations();
 
@@ -46,7 +49,7 @@ export function ReferenceRangeBadge({
     return (
       <Badge
         variant="outline"
-        className={`text-muted-foreground ${compactClass}`.trim()}
+        className={cn("text-muted-foreground", compactClass, className)}
       >
         {compact ? null : <Minus aria-hidden />}
         {t("labs.range.inRange")}
@@ -64,7 +67,7 @@ export function ReferenceRangeBadge({
       ? "border-info/30 bg-info/10 text-info"
       : "border-warning/30 bg-warning/10 text-warning";
   return (
-    <Badge variant="outline" className={`${toneClass} ${compactClass}`.trim()}>
+    <Badge variant="outline" className={cn(toneClass, compactClass, className)}>
       <Icon aria-hidden />
       {label}
     </Badge>