25-hydroxyvitamin DNutrition library
LibraryBlood markersVitamins & minerals
25-hydroxyvitamin D
25-hydroxyvitamin D is the standard circulating marker of vitamin D status and anchors the store model in Trends.
Deficiency is common in pregnancy and affects calcium absorption, immune tone, and may influence fetal bone mineralisation. Toxicity is rare but very high levels warrant review.
How to read it
Season, latitude, supplement dose, and binding proteins all shift results. Retest 8–12 weeks after changing supplementation.
Linked nutrient: Vitamin D · calibrates store dynamics in Trends when logged.
Trimester context
| Stage | For the mother | For the baby |
|---|---|---|
| First trimester | Supports early immune and bone metabolism. | Fetal skeleton mineralisation begins mid-pregnancy. |
| Second trimester | Demand rises with fetal skeletal growth. | Peak calcium transfer occurs in the third trimester. |
| Third trimester | Adequate status supports pelvic floor and mood resilience. | Neonatal stores partly reflect late-pregnancy maternal levels. |
Connections
See also
- Vitamin Dnutrient