The normal range for brain natriuretic peptide levels is zero to 99 picograms per milliliter, notes WebMD. This can also be converted to zero to 99 nanograms per liter. More »

The normal range values of PTH levels are from 10 to 55 picograms per milliliter, states the National Institutes of Health's MedlinePlus. The PTH test is a blood test used to detect the range values of the parathyroid ho... More »

Normal estrogen levels for women before menopause are 60 to 400 picograms per milliliter, according to WebMD. For women after menopause, the standard measurement is less than 130 picograms per milliliter. Normal results ... More »

Normal vitamin B12 blood levels range between 110 and 1,500 picograms per milliliter or 81 and 1,107 picomoles per liter, depending on the type of test performed and the individual laboratory's standards, explains WebMD.... More »

Normal parathyroid hormone, or PTH, levels are 10 to 55 picograms per milliliter, according to Healthline. PTH levels over 55 picograms per milliliter may indicate chronic kidney disease, vitamin D disorders, parathyroid... More » Health Medical Ranges & Levels

The normal range for B12 concentrations in the blood are 200 to 900 picograms per milliliter of blood, states Medline Plus. Any level above 900 or below 200 may point to an underlying condition. More »

The normal range for vitamin B12 levels is from about 110 to 1,500 picograms per milliliter (pg/mL), according to WebMD. Vitamin B12 levels are determined from a standard blood test. More » Health Medications & Vitamins Vitamins & Supplements