Vitamin D Calculator
Single measurements of 25-hydroxyvitamin D (vitamin D) do not accurately reflect long-term exposure due to seasonal variations in the intensity of sunlight. Use this calculator to estimate your annual mean concentration of vitamin D based on a single measurement and the time of year that measurement was taken. Questions or comments? Email Ian de Boer.
Urine Phosphate Calculator
Traditional management of stage III-V chronic kidney disease (CKD) includes dietary phosphate restriction and/or the use of phosphorus binders. Monitoring dietary phosphorus is important for assessing patient compliance and the effectiveness of therapeutic interventions. The 24-hour urine collection is the gold standard method for measuring dietary phosphorus; however, this procedure is cumbersome and prone to timing errors. Use this calculator to estimate 24-hour urine phosphorus concentration based on spot urine phosphorus concentration, spot urine creatinine, age, gender, and body weight.