diff --git a/src/utils/hendelseFilteringUtils.tsx b/src/utils/hendelseFilteringUtils.tsx
index e4401d73..2c915b4f 100644
--- a/src/utils/hendelseFilteringUtils.tsx
+++ b/src/utils/hendelseFilteringUtils.tsx
@@ -184,7 +184,7 @@ export const getSortedEventsFromSortingType = (
       return sortEventsOnVeileder(personregister, veiledere, type);
     case 'UKE_ASC':
     case 'UKE_DESC':
-      return sortEventsOnWeek(personregister, type);
+      return sortEventsOnTilfelleVarighet(personregister, type);
     case 'DATO_ASC':
     case 'DATO_DESC':
       return sortEventsOnFrist(personregister, type);
@@ -289,27 +289,43 @@ const sortEventsOnName = (
     : Object.fromEntries(sorted.reverse());
 };
 
-const sortEventsOnWeek = (
+const sortEventsOnTilfelleVarighet = (
   personregister: PersonregisterState,
   order: SortingType
 ): PersonregisterState => {
   const sorted = Object.entries(personregister).sort(
     ([, persondataA], [, persondataB]) => {
-      const startDateA =
-        persondataA.latestOppfolgingstilfelle?.oppfolgingstilfelleStart;
-      const startDateB =
-        persondataB.latestOppfolgingstilfelle?.oppfolgingstilfelleStart;
-      if (!startDateA) return order === 'UKE_ASC' ? -1 : 1;
-      if (!startDateB) return order === 'UKE_ASC' ? 1 : -1;
-      if (startDateA > startDateB) return order === 'UKE_ASC' ? -1 : 1;
-      if (startDateA < startDateB) return order === 'UKE_ASC' ? 1 : -1;
-      return 0;
+      const varighetA = persondataA.latestOppfolgingstilfelle?.varighetUker;
+      const varighetB = persondataB.latestOppfolgingstilfelle?.varighetUker;
+      if (!varighetA) return order === 'UKE_ASC' ? -1 : 1;
+      if (!varighetB) return order === 'UKE_ASC' ? 1 : -1;
+      const compareVarighet =
+        order === 'UKE_ASC' ? varighetA - varighetB : varighetB - varighetA;
+      return compareVarighet === 0
+        ? compareTilfelleStart(persondataA, persondataB, order)
+        : compareVarighet;
     }
   );
 
   return Object.fromEntries(sorted);
 };
 
+const compareTilfelleStart = (
+  persondataA: PersonData,
+  persondataB: PersonData,
+  order: SortingType
+) => {
+  const startDateA =
+    persondataA.latestOppfolgingstilfelle?.oppfolgingstilfelleStart;
+  const startDateB =
+    persondataB.latestOppfolgingstilfelle?.oppfolgingstilfelleStart;
+  if (!startDateA) return order === 'UKE_ASC' ? -1 : 1;
+  if (!startDateB) return order === 'UKE_ASC' ? 1 : -1;
+  if (startDateA > startDateB) return order === 'UKE_ASC' ? -1 : 1;
+  if (startDateA < startDateB) return order === 'UKE_ASC' ? 1 : -1;
+  return 0;
+};
+
 const sortEventsOnFrist = (
   personregister: PersonregisterState,
   order: 'DATO_ASC' | 'DATO_DESC'
diff --git a/test/utils/hendelseFilteringUtilsTest.ts b/test/utils/hendelseFilteringUtilsTest.ts
index 69c57145..b67d5dec 100644
--- a/test/utils/hendelseFilteringUtilsTest.ts
+++ b/test/utils/hendelseFilteringUtilsTest.ts
@@ -82,6 +82,112 @@ describe('hendelseFilteringUtils', () => {
     expect(Object.values(result)[1]?.navn).to.deep.equal('Bjarne Bjarne');
     expect(Object.values(result)[2]?.navn).to.deep.equal('Agnes Agnes');
   });
+
+  describe('sort by sykefravar varighet uker', () => {
+    const personWithLongestVarighet: PersonData = {
+      ...createPersonDataWithName('Agnes Agnes'),
+      latestOppfolgingstilfelle: {
+        varighetUker: 10,
+        virksomhetList: [],
+        oppfolgingstilfelleStart: new Date('2023-01-01'),
+        oppfolgingstilfelleEnd: new Date('2023-03-15'),
+      },
+    };
+    const personWithShortestVarighet: PersonData = {
+      ...createPersonDataWithName('Bjarne Bjarne'),
+      latestOppfolgingstilfelle: {
+        varighetUker: 4,
+        virksomhetList: [],
+        oppfolgingstilfelleStart: new Date('2023-02-01'),
+        oppfolgingstilfelleEnd: new Date('2023-02-28'),
+      },
+    };
+    const personWithEarliestTilfelleStart: PersonData = {
+      ...createPersonDataWithName('Agnes Agnes'),
+      latestOppfolgingstilfelle: {
+        varighetUker: 8,
+        virksomhetList: [],
+        oppfolgingstilfelleStart: new Date('2023-01-01'),
+        oppfolgingstilfelleEnd: new Date('2023-03-01'),
+      },
+    };
+    const personWithLatestTilfelleStart: PersonData = {
+      ...createPersonDataWithName('Bjarne Bjarne'),
+      latestOppfolgingstilfelle: {
+        varighetUker: 8,
+        virksomhetList: [],
+        oppfolgingstilfelleStart: new Date('2023-02-01'),
+        oppfolgingstilfelleEnd: new Date('2023-04-01'),
+      },
+    };
+
+    it('sorts by varighet uker ascending', () => {
+      const result = getSortedEventsFromSortingType(
+        {
+          '09128034883': personWithLongestVarighet,
+          '16624407794': personWithShortestVarighet,
+        },
+        [],
+        'UKE_ASC'
+      );
+      expect(Object.values(result)[0]?.navn).to.deep.equal(
+        personWithShortestVarighet.navn
+      );
+      expect(Object.values(result)[1]?.navn).to.deep.equal(
+        personWithLongestVarighet.navn
+      );
+    });
+
+    it('sorts by varighet uker descending', () => {
+      const result = getSortedEventsFromSortingType(
+        {
+          '09128034883': personWithLongestVarighet,
+          '16624407794': personWithShortestVarighet,
+        },
+        [],
+        'UKE_DESC'
+      );
+      expect(Object.values(result)[0]?.navn).to.deep.equal(
+        personWithLongestVarighet.navn
+      );
+      expect(Object.values(result)[1]?.navn).to.deep.equal(
+        personWithShortestVarighet.navn
+      );
+    });
+
+    it('sorts by tilfelle-start if equal varighet uker ascending', () => {
+      const result = getSortedEventsFromSortingType(
+        {
+          '09128034883': personWithEarliestTilfelleStart,
+          '16624407794': personWithLatestTilfelleStart,
+        },
+        [],
+        'UKE_ASC'
+      );
+      expect(Object.values(result)[0]?.navn).to.deep.equal(
+        personWithLatestTilfelleStart.navn
+      );
+      expect(Object.values(result)[1]?.navn).to.deep.equal(
+        personWithEarliestTilfelleStart.navn
+      );
+    });
+    it('sorts by tilfelle-start if equal varighet uker descending', () => {
+      const result = getSortedEventsFromSortingType(
+        {
+          '09128034883': personWithEarliestTilfelleStart,
+          '16624407794': personWithLatestTilfelleStart,
+        },
+        [],
+        'UKE_DESC'
+      );
+      expect(Object.values(result)[0]?.navn).to.deep.equal(
+        personWithEarliestTilfelleStart.navn
+      );
+      expect(Object.values(result)[1]?.navn).to.deep.equal(
+        personWithLatestTilfelleStart.navn
+      );
+    });
+  });
   describe('sort by frist', () => {
     it('Sorts by aktivitetskrav avventer-frist ascending', () => {
       const personWithEarliestFrist: PersonData = {