from Section I - Pathophysiology of Pediatric Liver Disease
Published online by Cambridge University Press: 19 January 2021
The liver is a multifunctional organ that is involved in a number of critical excretory, synthetic and metabolic functions. Biochemical assessment of these functions in children is undertaken by utilizing a number of tests performed in clinical laboratories. Many of the most commonly utilized serum chemistry tests, like aminotransferase and alkaline phosphatase levels, are often referred to as liver function tests (LFTs), which is a misnomer, as these do not actually measure or indicate liver function. Rather, these tests should be referred to as liver enzyme tests, reserving the term LFTs to refer to measures of hepatocyte synthetic function such as international normalized ratio (INR), prothrombin time (PT) or serum albumin. Any single biochemical test provides limited information, which must be placed in the context of the entire clinical and historic picture. Currently, the most commonly available laboratory evaluative tests of the liver are used to: (1) screen for and document liver injury; (2) identify the type or pattern of liver disorder and the site of injury; (3) prognosticate and follow-up children with chronic liver disease; and (4) serially monitor the course of liver disease, evaluate the response to treatment and adjust a treatment regimen, when appropriate. Tests to evaluate liver disease can be divided into five categories (Table 7.1)
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