Vitamin D Deficiency

Order serum 25-hydroxyvitamin D [25(OH)D] as the nutritional status marker. Serum 25(OH)D below 10 ng/mL has been associated with a higher prevalence of osteomalacia or rickets; the Institute of Medicine concluded that 20 ng/mL is adequate for skeletal health in healthy adults, and XLH guidance targets a 25(OH)D concentration above 20 ng/mL. Thresholds above this level remain clinically variable across laboratories and disease contexts. ScienceDirect+2ScienceDirectErgocalciferol - an overview | ScienceDirect TopicsNatureClinical practice recommendations for the diagnosis and management of X-linked hypophosphataemia | Nature Reviews NephrologyccjmVitamin D supplementation: Pearls for practicing clinicians

When deficiency may be clinically consequential, obtain total calcium with albumin, phosphate, alkaline phosphatase, creatinine/eGFR, and intact PTH. Vitamin D deficiency can produce hypocalcemia and hypophosphatemia, triggering secondary hyperparathyroidism; the resulting PTH elevation increases renal phosphate loss. ScienceDirect+1ScienceDirectRickets and osteomalacia - ScienceDirectThe LancetHyperparathyroidism

Add fracture-directed imaging or metabolic bone evaluation when symptoms or fractures suggest defective mineralization. Adult osteomalacia is associated with fractures and pseudofractures, whereas rickets shows widened growth plates; these imaging patterns should prompt a search for malabsorption, renal phosphate loss, genetic disease, or impaired vitamin D activation rather than attribution to low sun exposure alone. ScienceDirectScienceDirectRickets and osteomalacia - ScienceDirect

Insufficient oral or dermal vitamin D exposure is the most common cause of deficiency. In patients with a low 25(OH)D concentration and no major calcium-phosphate abnormality, prioritize a history of dietary intake, limited ultraviolet exposure, obesity, and factors limiting adherence; obesity may require several-fold higher supplementation doses to achieve and maintain a normal concentration. ccjmccjmVitamin D supplementation: Pearls for practicing clinicians

Malabsorption should move higher in the differential when low 25(OH)D coexists with persistent biochemical abnormalities despite oral replacement or with hepatobiliary, pancreatic, or gastrointestinal disease. Calcium malabsorption from these disorders can cause rickets or osteomalacia, and bariatric surgery—especially Roux-en-Y gastric bypass—is associated with vitamin D and other micronutrient deficiencies. ScienceDirect+1ScienceDirectRickets and osteomalacia - ScienceDirectajogThe importance of nutrition in pregnancy and lactation: lifelong consequences

Do not label all hypophosphatemic bone disease as nutritional vitamin D deficiency. In genetic or tumor-associated phosphate-wasting states, suppressed calcitriol production with an inappropriately normal or low circulating calcitriol concentration is a characteristic clue; renal tubular defects or damage are alternative causes of renal phosphate loss. ScienceDirectScienceDirectRickets and osteomalacia - ScienceDirect

Hypophosphatasia is a key exception when mineralization failure is accompanied by low rather than high alkaline phosphatase. This pattern reflects reduced activity of the bone alkaline phosphatase isoenzyme and pyrophosphate accumulation, which inhibits mineralization. ScienceDirectScienceDirectRickets and osteomalacia - ScienceDirect

Use native vitamin D—cholecalciferol or ergocalciferol—to correct nutritional deficiency and to maintain 25(OH)D above 20 ng/mL in the XLH guidance context. In adults with XLH receiving oral phosphate, combine phosphate supplements with active vitamin D rather than native vitamin D alone; adults require substantially lower active vitamin D and phosphate doses than children. NatureNatureClinical practice recommendations for the diagnosis and management of X-linked hypophosphataemia | Nature Reviews Nephrology

Do not extrapolate replacement regimens across disease states. A published loading strategy used vitamin D 20,000-40,000 IU once weekly followed by 4,000-6,000 IU daily maintenance, but dosing must be individualized to the indication, baseline concentration, absorption, renal function, calcium concentration, and concurrent active vitamin D or phosphate therapy. WileyWileyUse of a Loading Dose of Vitamin D for Treatment of Vitamin D ...

Ergocalciferol labeling describes a narrow therapeutic-to-toxic range and contraindicates use in hypercalcemia, malabsorption syndrome, abnormal sensitivity to vitamin D toxicity, and hypervitaminosis D. The labeled indications include hypoparathyroidism, vitamin D-resistant rickets, and familial hypophosphatemia; the high doses described for these indications require close medical supervision and laboratory monitoring. nctr-crs fdanctr-crs fda<br/> <br/> Vitamin D <br/> <br/> <br/> <br/> (Ergocalciferol Capsules, USP)

Refer for endocrine, nephrology, or metabolic bone evaluation when hypophosphatemia persists, calcitriol is inappropriately normal or low, alkaline phosphatase is low despite suspected osteomalacia, or fractures/pseudofractures occur. These findings raise renal phosphate-wasting disorders, FGF23-mediated disease, hypophosphatasia, or impaired vitamin D bioactivation or resistance. ScienceDirectScienceDirectRickets and osteomalacia - ScienceDirect

In CKD with secondary hyperparathyroidism, involve nephrology when calcium, phosphate, PTH, and alkaline phosphatase cannot be interpreted or controlled as a coherent CKD-MBD pattern, particularly if active vitamin D therapy is being considered or produces hypercalcemia, hyperphosphatemia, or PTH oversuppression. ScienceDirect+1ScienceDirectErgocalciferol versus calcitriol for controlling chronic kidney disease mineral bone disorder in stage 3 to 5 CKD: A randomized controlled trial - ScienceDirectWolters KluwerTreatment of secondary hyperparathyroidism in... : Nephrology Dialysis Transplantation