Vitamin D Test (Add-on)

A single-marker add-on measuring 25-hydroxyvitamin D from a venous blood sample, designed to be booked alongside the Personal Health Check. Assesses vitamin D status — a nutrient that is widely deficient in the Netherlands, particularly during the autumn and winter months when sunlight exposure is limited.

Vitamin D insufficiency is remarkably common in the Netherlands, where the latitude and cloud cover mean that cutaneous vitamin D synthesis is negligible for roughly six months of the year. Even during the summer, indoor-oriented lifestyles and sunscreen use can limit production. The 25-hydroxyvitamin D blood test is the established clinical standard for assessing vitamin D stores and guiding supplementation decisions. This add-on measures 25-OH vitamin D from the same venous blood draw as the Personal Health Check, so no additional appointment or blood draw is required. The result is included in the personalised Health Report alongside the standard panel markers, providing context for interpretation. Vitamin D plays a role in calcium absorption, bone mineralisation, immune regulation, muscle function, and mood — making it relevant well beyond skeletal health alone. The test is particularly valuable for individuals who spend most of their time indoors, have darker skin tones (which reduce cutaneous synthesis), follow restricted diets that exclude fortified dairy or fatty fish, or are supplementing vitamin D and want to verify that their dosage is achieving adequate serum levels. At EUR 28.50, it is one of the most affordable vitamin D tests available in Amsterdam and benefits from being interpreted within the broader context of the health check results.