General hospital · Assen

Wilhelmina Ziekenhuis Assen

Wait times over the norm63%

54 of 86 over the norm

Result€3.6 m

2025, margin 1.7%

Solvency38%

sector average 36% (2024)

Parking per hour€1.80

Assen

Locations

Wilhelmina Ziekenhuis, locatie AssenEuropaweg-Zuid, 9401RK Assen

Wait times

Latest report: 27 October 2026. Over the norm first. The colour measures a wait against the Treeknorm, the position against the other hospitals: position 1 is the shortest.

Over the norm, every fortnight

Wilhelmina Ziekenhuis AssenAll hospitals

Waits against the norm, by kind

within the Treeknormover it, up to one and a half timesmore than one and a half timesnot reported

Treatments

For	Wait	Position	Median in the Netherlands25th–75th percentile
CircumcisionUrology / Surgery	180 days	34 of 35	50 days31–74 days
VasectomySurgery / Urology	180 days	28 of 29	43 days28–63 days
Septoplasty (nasal septum surgery)ENT	180 days	53 of 61	81 days57–146 days
Enlarged prostate surgeryUrology	120 days	49 of 57	61 days43–99 days
Sleep apnoea treatmentENT / Respiratory medicine	100 days	14 of 17	42 days28–89 days
Eyelid surgeryOphthalmology	90 days	23 of 30	54 days39–89 days
Cataract surgeryOphthalmology	90 days	45 of 56	49 days30–84 days
Dupuytren's contracture surgeryPlastic surgery	82 days	31 of 45	66 days42–96 days
Pulmonary rehabilitationRehabilitation medicine	80 days	9 of 9	12 days7–28 days
Female sterilisationGynaecology	70 days	17 of 26	48 days35–89 days
Kidney stone removal through the skin (PCNL)Urology	66 days	20 of 25	49 days29–63 days
Breast reconstructionPlastic surgery	60 days	16 of 42	79 days52–130 days
Apicectomy (root-end surgery)Oral and maxillofacial surgery	60 days	22 of 31	39 days19–60 days
Tooth extraction without general anaestheticOral and maxillofacial surgery	60 days	20 of 34	57 days29–64 days
Tonsil or adenoid removalENT	50 days	24 of 63	60 days42–82 days
Grommets (ear tubes)ENT	50 days	43 of 61	37 days29–51 days
Incontinence or prolapse surgery (women)Gynaecology	42 days	14 of 61	71 days48–117 days
Umbilical hernia repair in adultsSurgery	39 days	16 of 50	53 days34–97 days
Groin hernia repairSurgery	39 days	23 of 65	49 days28–91 days
Surgery for benign anal conditionsSurgery / Dermatology	35 days	16 of 55	49 days33–80 days
Total hip replacementOrthopaedics	30 days	5 of 61	64 days42–90 days
Total knee replacementOrthopaedics	30 days	4 of 60	84 days45–117 days
IUI (intrauterine insemination)Gynaecology	30 days	19 of 28	9 days2–36 days
Cardiac catheterisationCardiology	30 days	33 of 42	21 days15–28 days
HysterectomyGynaecology	30 days	5 of 58	64 days42–89 days
IVF/ICSIGynaecology	30 days	9 of 16	27 days8–44 days
Trigger finger releasePlastic surgery	25 days	12 of 35	32 days23–51 days
Gallbladder removalSurgery	23 days	11 of 63	43 days30–64 days
Carpal tunnel surgerySurgery / Plastic surgery / Orthopaedics	21 days	10 of 37	44 days21–59 days
Endovenous varicose vein treatmentDermatology	14 days	1 of 37	57 days42–78 days
Cardiac rehabilitationRehabilitation medicine	14 days	5 of 13	15 days13–29 days
Stroke rehabilitationRehabilitation medicine	10 days	4 of 13	14 days10–35 days
Meniscus or knee ligament surgerySurgery / Orthopaedics	7 days	1 of 55	50 days33–75 days
Knee arthroscopyOrthopaedics	7 days	2 of 46	42 days27–63 days

Outpatient clinic: first appointment

For	Wait	Position	Median in the Netherlands25th–75th percentile
CataractOphthalmology	210 days	43 of 47	20 days8–40 days
Ophthalmology (general)Ophthalmology	210 days	52 of 58	59 days21–90 days
ENT (general)ENT	200 days	66 of 66	21 days12–30 days
Hearing loss and deafnessENT	200 days	47 of 47	25 days14–43 days
Sleep centreOther	200 days	23 of 24	70 days43–125 days
Neurology (general)Neurology	183 days	61 of 67	64 days48–90 days
Transgender careOther	180 days	4 of 5	78 days59–180 days
EndocrinologyInternal medicine	180 days	48 of 49	48 days29–67 days
Gastroenterology (general)Gastroenterology	172 days	52 of 66	98 days50–148 days
Gynaecology (general)Gynaecology	140 days	55 of 68	72 days45–114 days
NephrologyInternal medicine	105 days	47 of 51	33 days19–50 days
Internal medicine (general)Internal medicine	105 days	61 of 68	42 days24–61 days
Shoulder problemsOrthopaedics	70 days	45 of 48	20 days14–29 days
Incontinence in womenGynaecology	60 days	16 of 44	67 days49–91 days
Oral and maxillofacial surgeryOral and maxillofacial surgery	60 days	44 of 57	31 days15–59 days
Hip problemsOrthopaedics	56 days	45 of 51	14 days7–24 days
Orthopaedics (general)Orthopaedics	56 days	53 of 59	14 days7–30 days
Knee problemsOrthopaedics	56 days	46 of 51	14 days7–31 days
Geriatric medicineGeriatric medicine	56 days	55 of 63	28 days16–45 days
Paediatrics (general)Paediatrics	55 days	46 of 65	35 days21–57 days
ProctologySurgery	37 days	31 of 47	25 days13–48 days
Dermatology (general)Dermatology	35 days	32 of 66	35 days28–70 days
Cardiology (general)Cardiology	35 days	45 of 68	28 days16–45 days
Pain managementAnaesthesiology	35 days	21 of 65	58 days23–90 days
Foot and ankle problemsOrthopaedics	35 days	33 of 49	21 days11–50 days
Respiratory medicine (general)Respiratory medicine	34 days	43 of 68	28 days13–42 days
Urology (general)Urology	30 days	28 of 66	32 days20–60 days
Groin herniaSurgery	30 days	41 of 52	17 days7–28 days
Surgery (general)Surgery	30 days	54 of 66	14 days7–27 days
Fertility problemsGynaecology	29 days	10 of 55	60 days38–80 days
RehabilitationRehabilitation	28 days	14 of 40	36 days21–43 days
Suspicious skin lesionDermatology	21 days	30 of 48	13 days7–38 days
Vascular surgerySurgery	16 days	26 of 62	18 days10–30 days
Rheumatology (general)Rheumatology	14 days	4 of 60	47 days29–90 days
Plastic surgery for cancerPlastic surgery	14 days	18 of 32	11 days7–21 days
Plastic surgery (general)Plastic surgery	14 days	22 of 63	24 days10–42 days
Medical oncologyInternal medicine	9 days	24 of 49	9 days6–15 days
Breast clinicSurgery	4 days	42 of 59	3 days2–5 days

Tests

For	Wait	Position	Median in the Netherlands25th–75th percentile
Sleep apnoea testingENT / Respiratory medicine / Neurology	200 days	38 of 40	45 days25–70 days
ColonoscopyGastroenterology	110 days	57 of 61	28 days17–42 days
Hip or leg MRIRadiology	33 days	47 of 64	20 days10–33 days
Shoulder or arm MRIRadiology	33 days	42 of 59	20 days13–34 days
Back MRIRadiology	33 days	47 of 62	20 days13–33 days
Neck MRIRadiology	33 days	45 of 60	22 days13–33 days
Brain MRIRadiology	33 days	44 of 61	21 days11–35 days
Abnormal cervical smearGynaecology	30 days	32 of 46	17 days14–30 days
GastroscopyGastroenterology	27 days	32 of 61	26 days15–40 days
Bone density scan (DEXA)Radiology	16 days	22 of 60	18 days12–38 days
CT scanRadiology	16 days	35 of 63	14 days9–22 days
MammogramRadiology	12 days	49 of 62	5 days2–10 days
Ultrasound scanRadiology	12 days	28 of 66	13 days8–17 days
X-rayRadiology	1 days	27 of 61	1 days0–1 days

Quality per treatment

Report year 2025, as the hospital reported it, beside the median of all hospitals.

Tonsil or adenoid removal

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Re-operation for bleeding within 14 days (tonsils)lower is better	2.0%	2.6%
Re-operation for bleeding within 14 days (adenoids)lower is better	0.0%	0.0%

Abdominal aortic aneurysm

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Aortic aneurysm or dissection repairsnumber per year	30	69
Died within 30 days after repair of a ruptured aneurysmlower is better	8.3%	24.2%
Died within 30 days after repair of an intact aneurysmlower is better	1.0%	1.5%
Uncomplicated recovery after planned repair (textbook outcome)higher is better	62.8%	76.0%

Stroke

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Stroke patientsnumber per year	317	570
Median minutes from arrival to clot-busting treatmentlower is better	31	29

Breast implants

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Removed or replaced for a complication within 60 days (reconstruction)lower is better	6.2%	2.6%
Removed or replaced for a complication within 60 days (cosmetic)lower is better	0.0%	0.0%
Removed or replaced for a complication, day 61 to 365 (reconstruction)lower is better	12.5%	3.3%
Removed or replaced for a complication, day 61 to 365 (cosmetic)lower is better	0.0%	0.0%

Breast cancer

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Breast cancer patients operated onnumber per year	126	216
Surgical oncologists treating breast cancernumber of specialists	3	4
Plastic surgeons treating breast cancer patientsnumber of specialists	3	3
Median days from diagnosis to start of treatmentlower is better	22	32

Bowel cancer

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Colon cancer resectionsnumber per year	62	78
Rectal cancer resectionsnumber per year	—	30
Died within 90 days of rectal surgerylower is better	0.0%	0.0%
Complicated recovery after colon surgerylower is better	6.3%	11.6%
Complicated recovery after rectal surgerylower is better	0.0%	20.2%
Died within 90 days of colon surgerylower is better	1.9%	2.2%
Median days from diagnosis to treatment (colon)lower is better	42.5	36.8

Diabetes

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Diabetes patients treated by the paediatriciannumber per year	59	99
Diabetes patients treated by the internistnumber per year	972	1,350
Paediatrician: blood sugar on target (HbA1c below 58)higher is better	47.5%	47.8%
Internist: blood sugar on target (HbA1c below 58)higher is better	40.7%	42.3%
Paediatrician: blood sugar far too high (HbA1c above 86)lower is better	3.4%	5.9%
Internist: blood sugar far too high (HbA1c above 86)lower is better	6.3%	5.3%

Peripheral arterial disease

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Certified vascular surgeonsnumber of specialists	3	4
Vascular interventional radiologistsnumber of specialists	2	4

Gallbladder removal (gallstones)

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Readmitted for a complication within 30 days of surgerylower is better	0.3%	2.8%

Hip fracture

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Hip fractures treatednumber per year	263	293
Mobility score after 3 months, fully mobile before (1 = best)lower is better	3	2.6
ADL help needed after 3 months, independent before (0 = none)lower is better	0.7	1.3

Gynaecological cancer

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Debulking operations for ovarian cancernumber per year	—	60
Operations for endometrial cancernumber per year	17	64
Tumour fully removed at primary debulking (ovary)higher is better	—	90.8%
Complicated recovery after ovarian debulking (adjusted)lower is better	—	6.9%
Complicated recovery after keyhole hysterectomy (adjusted)lower is better	9.1%	0.0%
Died within 30 days of ovarian debulking (adjusted)lower is better	—	0.0%
Median days from first visit to debulking surgerylower is better	—	35.2

Slipped disc or spinal stenosis

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Re-operation within 30 dayslower is better	0.0%	0.4%
Spinal fluid leak during surgerylower is better	1.9%	0.3%
Deep wound infectionlower is better	0.0%	0.0%
More muscle weakness right after surgerylower is better	0.0%	0.0%

Hip replacement

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Hip replacementsnumber per year	439	421
Orthopaedic surgeons performing hip revisionsnumber of specialists	3	4
Orthopaedic surgeons placing hip replacementsnumber of specialists	5	5
Deep wound infection within 90 dayslower is better	0.8%	0.7%
Average hip score gain (OHS) after 12 monthshigher is better	17.3	18.6
Average drop in pain when active after 12 monthshigher is better	5.3	5.8
Revision within 1 year (adjusted)lower is better	0.5%	0.9%

Incontinence or prolapse in women

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Much or very much better after surgeryhigher is better	90.0%	90.8%

Cancer care (general)

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Kidney cancer operationsnumber per year	—	54
Colon resectionsnumber per year	100	131
Rectal resectionsnumber per year	—	46
Resections of liver metastasesnumber per year	—	36
Thyroid cancer patients operated onnumber per year	—	18
Gynaecologic oncologists in FTEnumber of specialists	1.4	2.6

Knee replacement

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Total knee replacementsnumber per year	382	310
Partial knee replacementsnumber per year	88	79
Orthopaedic surgeons performing knee revisionsnumber of specialists	4	3
Orthopaedic surgeons placing knee replacementsnumber of specialists	5	5
Deep wound infection within 90 dayslower is better	0.4%	0.4%
Average knee score gain (OKS) after 12 monthshigher is better	14.8	15.3
Average drop in pain when active after 12 monthshigher is better	4.8	4.9
Revision within 3 years (adjusted)lower is better	1.9%	1.3%

Surgery for children

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Groin and scrotal operations in childrennumber per year	21	43
Operations for pyloric stenosisnumber per year	—	15

Emergency department

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Patients with severe multiple injuries receivednumber per year	27	33

Cataract surgery

Indicator	Wilhelmina Ziekenhuis Assen	Median in the Netherlands
Better sight after surgery (at least 1 line gained)higher is better	99.0%	94.5%
Within 0.5 dioptre of the target strength after 4-6 weekshigher is better	84.0%	77.7%

Annual accounts

Consolidated figures of Stichting Wilhelmina Ziekenhuis Assen, from its public annual accounts.

Year	Revenue	Costs	Result	Margin	Equity	Solvency	Cash
2025filed 28 May 2026	€209 m	€204 m	€3.6 m	1.7%	€56 m	38.1%	€23 m
2024filed 16 December 2025	€192 m	€192 m	−€2.0 m	-1.0%	€52 m	36.8%	€22 m
2023filed 31 May 2024	€175 m	€177 m	−€2.1 m	-1.2%	€54 m	37.2%	€29 m
Sector average, General hospital (2024)
2024	—	—	—	2%	—	36%	—

Staff

Year	Care staff	Sick leave	Long-open vacancies
2025	995	6.8%	3
2024	944	6.1%	78
2023	—	—	—

Care staff: the average number of people in care. Sick leave: the care staff's sickness absence. Long open: vacancies open for three months or more.

Board and supervision

As the register lists them with the annual accounts for 2025.

Board of directors

Erwin van SantenBestuurder · since 1 January 2023
Esther Agterdenbos - van de ReeBestuurder · since 27 November 2024

Supervisory board

Gretha Johanna de GroothLid Raad van Toezicht · since 1 June 2018
Lukas Johannes van KalsbeekLid Raad van Toezicht · since 14 June 2019
Maria Johanna Elisabeth MouritsLid van het toezichthoudend orgaan · since 1 August 2024
Willemtien Roelfiena van 't SlotLid van het toezichthoudend orgaan · since 1 August 2024
Jules August Marie de VetLid van het toezichthoudend orgaan · since 1 June 2025

Proxies and others

Jan EisenGevolmachtigde · since 1 January 2022
Henricus Lubbertus HogeGevolmachtigde · since 7 November 2022

Parking

Assen

€1.80 an hour. The first 30 minutes free. Daily maximum €6.62.

€0.03 per minute with a €0.55 start fee; week card €18.24, 10-ride card €28.67.

Read on the hospital's website, 2 November 2026.