The 4-albumin term in the corrected calcium formula typically refers to:

The term "4-albumin" in the corrected calcium formula refers to a normal albumin level, specifically 4 g/dL, which is often considered the standard reference point for albumin levels in the body. When calculating corrected calcium, it's essential to recognize that calcium levels can be influenced by the concentration of albumin in the blood serum.

In this context, a normal albumin level serves as a baseline to determine whether adjustments are needed for calcium calculations. If albumin levels are lower than this reference point, it indicates that calcium may be falsely low when measured, necessitating a correction. Conversely, if the albumin level is higher, it may lead to a falsely elevated calcium level. Therefore, understanding that "4-albumin" signifies a normal level helps clarify how deviations from this standard can affect calcium measurements, highlighting the importance of accurate interpretation in clinical settings.