Normal levels of prostate-specific antigen, or PSA, range from 1.0 to 4.0 nanograms per milliliter of blood, according to MedicineNet. The normal level may, however, be higher in older men and lower in young men because ... More »

High PSA levels may indicate prostate cancer, prostatitis or an enlarged prostate, states WebMD. PSA levels in men naturally increase with age. In most cases, a PSA level under 4 nanograms per milliliter is considered no... More »

Normal prostate-specific antigen levels go up to 2.5 nanograms per milliliter for ages 40 to 49, 4.0 nanograms per milliliter for 50 to 59, 4.5 nanograms per milliliter for 60 to 69 and 6.5 nanograms per milliliter for 7... More »

A ferritin blood test measures the level of iron in the blood, and normal levels should fall within the range of 12 to 300 nanograms per milliliter of blood for men and 12 to 150 nanograms per milliliter of blood for wom... More »

Low levels of PSA, or prostate-specific antigen, are considered desirable, since they indicate a lower risk for prostate cancer; readings below 4 nanograms per milliliter are considered normal, according to Health Magazi... More »

Normal prostate-specific antigen levels go up to 2.5 nanograms per milliliter for ages 40 to 49, 4.0 nanograms per milliliter for 50 to 59, 4.5 nanograms per milliliter for 60 to 69 and 6.5 nanograms per milliliter for 7... More »

In blood tests, the accepted normal range for vitamin D levels runs from 20 to 50 nanograms per milliliter, says WebMD. A person with less than 12 nanograms per milliliter has a deficiency. Nevertheless, there is no medi... More »