Which postpartum value increases due to the catabolic process of involution compared to the 3rd trimester?

Involution is the process by which the uterus returns to its pre-pregnancy size and condition after childbirth. This catabolic process involves the breakdown of excess tissue and fluids, leading to various changes in maternal physiology. One of the key aspects of this process is the increase in Blood Urea Nitrogen (BUN) levels after delivery compared to the 3rd trimester.

During pregnancy, the body retains more fluid and there may be an increase in overall blood volume, which can dilute certain lab values, including BUN. However, after delivery, as the body starts to shed excess fluid and the workload on the kidneys normalizes, BUN levels can rise due to the catabolism of tissues that were previously retained during the pregnancy. This catabolic activity leads to increased nitrogen production from the breakdown of proteins and other constituents, which enhances the concentration of urea in the blood, thus leading to a higher BUN reading postpartum.

Creatinine clearance typically does not increase in the same way as BUN because it reflects renal function and is influenced by other factors. Proteinuria is not expected to increase significantly after delivery but rather is monitored due to potential complications like preeclampsia. Changes in electrolytes during this time can occur, but they do