diff --git a/src/components/Personrad.tsx b/src/components/Personrad.tsx
index f40aab22..88594a5d 100644
--- a/src/components/Personrad.tsx
+++ b/src/components/Personrad.tsx
@@ -10,9 +10,10 @@ import {
 } from '@/utils/lenkeUtil';
 import { PersonData } from '@/api/types/personregisterTypes';
 import { useAktivBruker } from '@/data/modiacontext/useAktivBruker';
-import { getWeeksSinceDate } from '@/utils/dateUtils';
+import { getEarliestDate, getWeeksBetween } from '@/utils/dateUtils';
 import { PersonRadVirksomhetColumn } from '@/components/PersonRadVirksomhetColumn';
 import { Labels } from '@/components/Labels';
+import { OppfolgingstilfelleDTO } from '@/api/types/personoversiktTypes';
 
 interface PersonradProps {
   fnr: string;
@@ -43,6 +44,22 @@ const VelgBoks = styled(Checkbox)`
   padding-bottom: 2em;
 `;
 
+const getVarighetOppfolgingstilfelle = (
+  oppfolgingstilfelle: OppfolgingstilfelleDTO | undefined
+): string => {
+  if (oppfolgingstilfelle) {
+    const start = oppfolgingstilfelle.oppfolgingstilfelleStart;
+    const now = new Date();
+    const end = getEarliestDate(
+      oppfolgingstilfelle.oppfolgingstilfelleEnd,
+      now
+    );
+    return `${getWeeksBetween(start, end)} uker`;
+  } else {
+    return 'Ukjent';
+  }
+};
+
 export const Personrad = (props: PersonradProps): ReactElement => {
   const {
     fnr,
@@ -63,11 +80,9 @@ export const Personrad = (props: PersonradProps): ReactElement => {
     });
   };
 
-  const startDatoOppfolgingstilfelle =
-    personData.latestOppfolgingstilfelle?.oppfolgingstilfelleStart;
-  const oppfolgingstilfelleLengthInWeeks = !!startDatoOppfolgingstilfelle
-    ? `${getWeeksSinceDate(startDatoOppfolgingstilfelle)} uker`
-    : 'Ukjent';
+  const oppfolgingstilfelleLengthInWeeks = getVarighetOppfolgingstilfelle(
+    personData.latestOppfolgingstilfelle
+  );
 
   return (
     <StyledPersonRad index={index} selected={kryssAv}>
diff --git a/src/utils/dateUtils.ts b/src/utils/dateUtils.ts
index 81029b34..99341d4e 100644
--- a/src/utils/dateUtils.ts
+++ b/src/utils/dateUtils.ts
@@ -1,16 +1,11 @@
 import dayjs from 'dayjs';
 
-const ONE_WEEK_MILLIS = 7 * 24 * 60 * 60 * 1000;
-
-export const getWeeksSinceDate = (date: Date): number => {
-  const now = new Date();
-  return getWeeksBetween(new Date(date), now);
+export const getEarliestDate = (date1: Date, date2: Date): Date => {
+  return date1 < date2 ? date1 : date2;
 };
 
 export const getWeeksBetween = (date1: Date, date2: Date): number => {
-  return Math.round(
-    Math.abs(date1.getTime() - date2.getTime()) / ONE_WEEK_MILLIS
-  );
+  return Math.abs(dayjs(date1).diff(date2, 'week'));
 };
 
 export const toReadableDate = (dateArg: Date | null): string => {
diff --git a/test/components/Personrad.test.tsx b/test/components/Personrad.test.tsx
index 18237cec..cb8c6084 100644
--- a/test/components/Personrad.test.tsx
+++ b/test/components/Personrad.test.tsx
@@ -70,6 +70,14 @@ const personDataAktivitetskravAvventMedFrist: PersonData = {
   ...personDataAktivitetskravAvventUtenFrist,
   aktivitetskravVurderingFrist: new Date('2023-04-01'),
 };
+const personWithOppfolgingstilfelle: PersonData = {
+  ...defaultPersonData,
+  latestOppfolgingstilfelle: {
+    oppfolgingstilfelleStart: new Date('2023-01-01'),
+    oppfolgingstilfelleEnd: new Date('2023-01-15'),
+    virksomhetList: [],
+  },
+};
 
 describe('Personrad', () => {
   beforeEach(() => {
@@ -95,14 +103,22 @@ describe('Personrad', () => {
     expect(screen.getByText(testdata.fnr1)).to.exist;
     expect(screen.getByText('diskresjonsmerket')).to.exist;
   });
+
   it('Skal rendre label med frist-dato for aktivitetskrav AVVENT', () => {
     renderPersonrad(personDataAktivitetskravAvventMedFrist);
 
     expect(screen.getByText('Avventer (01.04.2023)')).to.exist;
   });
+
   it('Skal rendre label uten frist-dato for aktivitetskrav AVVENT når frist mangler', () => {
     renderPersonrad(personDataAktivitetskravAvventUtenFrist);
 
     expect(screen.getByText('Avventer')).to.exist;
   });
+
+  it('Viser riktig utregning av varighet på sykefraværet', () => {
+    renderPersonrad(personWithOppfolgingstilfelle);
+
+    expect(screen.getByText('2 uker')).to.exist;
+  });
 });
diff --git a/test/utils/dateUtils.test.ts b/test/utils/dateUtils.test.ts
index 6d8e5ae4..e31c88c3 100644
--- a/test/utils/dateUtils.test.ts
+++ b/test/utils/dateUtils.test.ts
@@ -1,13 +1,22 @@
 import { expect } from 'chai';
-import { getWeeksBetween, toReadableDate } from '@/utils/dateUtils';
+import {
+  getEarliestDate,
+  getWeeksBetween,
+  toReadableDate,
+} from '@/utils/dateUtils';
 
 describe('dateUtils', () => {
-  describe('week calculations', () => {
+  describe('Calculations', () => {
     it('Will calculate number of weeks between two dates', () => {
       const date1 = new Date('2022-10-01');
-      const date2 = new Date('2022-10-14');
+      const date2 = new Date('2022-10-15');
       expect(getWeeksBetween(date1, date2)).to.equal(2);
     });
+    it('Will calculate earliest date', () => {
+      const earliesDate = new Date('2023-01-01');
+      const latestDate = new Date('2023-02-02');
+      expect(getEarliestDate(earliesDate, latestDate)).to.equal(earliesDate);
+    });
   });
   describe('readable date', () => {
     it('returns empty string if date is null', () => {