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Additionally, ALP levels are "not well defined" as of 2020, and can vary by sex and by racial group. [5] Latinos tend to have higher normal levels, followed by those of African heritage, Europeans, and Asians or Pacific Islanders tend to have the lowest baseline ALP levels (all groups assuming body mass index within normal weight range). [5]
The level of alkaline phosphatase in the blood is checked through the ALP test, which is often part of routine blood tests. The levels of this enzyme in the blood depend on factors such as age, sex, or blood type. [2] Blood levels of alkaline phosphatase also increase by two to four times during pregnancy.
Mild elevation of ALP can be seen in liver cirrhosis, hepatitis, and congestive cardiac failure. Transient hyperphosphataemia is a benign condition in infants, and can reach normal level in 4 months. In contrast, low levels of ALP is found in hypothyroidism, pernicious anemia, zinc deficiency, and hypophosphatasia. [6]
For most substances presented, the optimal levels are the ones normally found in the population as well. More specifically, optimal levels are generally close to a central tendency of the values found in the population. However, usual and optimal levels may differ substantially, most notably among vitamins and blood lipids, so these tables give ...
ALP levels greater than 5 times normal tend to indicate obstruction, while levels greater than 10 times normal can indicate drug (toxin) induced cholestatic hepatitis or cytomegalovirus infection. Both of these conditions can also have ALT and AST greater than 20 times normal. GGT levels greater than 10 times normal typically indicate cholestasis.
Alkaline phosphatase levels are usually high in hyperparathyroidism due to high bone turn over. In primary hyperparathyroidism, levels may remain within the normal range, but this is inappropriately normal given the increased levels of plasma calcium. [citation needed]
Patients with a persistent elevation of ALP but whose ALP levels are not above the threshold of 1.67 times the upper limit of normal have historically not been studied in clinical trials of new ...
Under normal settings, TPN causes a slight elevation of ALP levels. However, this does not indicate cholestasis alone. [48] In the case of TPN-induced cholestasis, there is an excessive elevation of ALP, gamma-glutamyltransferase (GGT), and conjugated bilirubin. [58]