What it measures
A calcium result adjusted for the albumin level in the same sample. About half of blood calcium is bound to albumin, so a low or high albumin would otherwise make calcium look low or high. Labs do not work it out when albumin is very low or very high.
Why people test it
- Often reported next to, or in place of, total calcium in a bone profile.
- Measured when looking into the parathyroid glands, which control calcium levels.
- Monitored in people with kidney disease or taking vitamin D on prescription.
Typical range
Ranges vary by lab, method, age and sex, and your report shows the lab's own range. One NHS trust gives 2.20 to 2.60 mmol/L for adjusted calcium. Source: Royal Liverpool pathology handbook: Calcium (adjusted) serum.
Finger-prick or vein?
A vein draw is the more common route, though some providers offer finger-prick kits. Calcium and albumin come from the same sample.
