Non-alcoholic fatty liver disease laboratory findings: Difference between revisions

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{{CMG}}; {{AE}} {{VKG}}
{{CMG}}; {{AE}} {{VKG}}
==Overview==
==Overview==
There are no speicific diagnostic laboratory findings associated with non alcoholic fatty liver disease. Laboratory findings include abnormal liver function tests
There are no specific diagnostic laboratory findings associated with non alcoholic fatty liver disease. Laboratory findings include abnormal liver function tests but are unspecific. Other laboratory tests are generally performed to rule out other diagnosis.
Elevated [[liver function tests]] are common. Typically, one finds a 2-4 fold elevation of the [[ALT]] above the normal limit and an ALT/AST a ratio of greater than 1.This ratio is imperfect, as [[Aspartate transaminase|AST]] tends to rise with the degree of [[fibrosis]]. The Ratio of Aspartate Aminotransferase to Alanine Aminotransferase: Potential Value in Differentiating Nonalcoholic Steatohepatitis From Alcoholic Liver disease.Furthermore, high ALT values within the reference range (less than 40 IU) are still predictive of [[NAFLD]]/[[NASH]]. Higher Concentrations of Alanine Aminotransferase within the Reference Interval Predict Nonalcoholic Fatty Liver Disease.Another blood test that can be elevated is the [[ferritin]]. Typically, and except in very advanced disease, the liver's synthetic function is intact with normal [[albumin]] and [[INR]].
When considering NAFLD, other tests are generally performed, including those for associated conditions (e.g. [[glucose]], [[hemoglobin A1C]]) and those to distinguish this disease from viral [[hepatitis]]. Additionally, [[autoimmune]] causes are ruled out with serology. [[Thyroid-stimulating hormone|TSH]] is warranted, as [[hypothyroidism]] is more prevalent in NASH patients.


==Laboratory Findings==
==Laboratory Findings==


*There is no significant diagnostic laboratory findings associated with NAFLD.
*There is no specific laboratory findings diagnostic for non alcoholic fatty liver disease.<ref name="urlNonalcoholic fatty liver disease: Indications for liver biopsy and noninvasive biomarkers - Noureddin - 2012 - Clinical Liver Disease - Wiley Online Library">{{cite web |url=http://onlinelibrary.wiley.com/doi/10.1002/cld.65/pdf |title=Nonalcoholic fatty liver disease: Indications for liver biopsy and noninvasive biomarkers - Noureddin - 2012 - Clinical Liver Disease - Wiley Online Library |format= |work= |accessdate=}}</ref><ref name="urlNonalcoholic fatty liver disease (NAFLD), including nonalcoholic steatohepatitis (NASH)">{{cite web |url=https://www.uptodate.com/contents/nonalcoholic-fatty-liver-disease-nafld-including-nonalcoholic-steatohepatitis-nash-beyond-the-basics |title=Nonalcoholic fatty liver disease (NAFLD), including nonalcoholic steatohepatitis (NASH) |format= |work= |accessdate=}}</ref>
*Liver function tests
**Typical finding include a 2-4 fold elevation of the [[ALT]] 
**An [[ALT]]/[[AST]] ratio of greater than 1.


*An elevated concentration of serum aspartate transaminase ('''[[Aspartate transaminase|AST]]''') and alanine transaminase ('''[[Alanine transaminase|ALT]]''') is not reliable for the diagnostic of NAFLD.
* Evaluation for alternative causes of liver disease should be performed.
*[[Ultrasound]](USG), [[Computed tomography|computer tomography]] (CT) and [[magnetic resonance imaging]] (MRI) are usually not a reliable approach to diagnosis for patients with NAFLD.
** These include [[HCV|HCV serology]] , serologies for [[autoimmune hepatitis]], and copper studies including serum [[ceruloplasmin]] and 24-hour urinary copper if [[Wilson's disease|Wilson disease]] is suspected.


==Liver Biopsy==
* [[Fasting plasma glucose]] testing following an overnight fast is important to look for [[hyperglycemia]], which is an indicator of [[insulin resistance]].
* Even though other exams may endorse a diagnosis of NASH, every now and then a liver biopsy is required to affirm it<ref name="urlNonalcoholic fatty liver disease: Indications for liver biopsy and noninvasive biomarkers - Noureddin - 2012 - Clinical Liver Disease - Wiley Online Library">{{cite web |url=http://onlinelibrary.wiley.com/doi/10.1002/cld.65/pdf |title=Nonalcoholic fatty liver disease: Indications for liver biopsy and noninvasive biomarkers - Noureddin - 2012 - Clinical Liver Disease - Wiley Online Library |format= |work= |accessdate=}}</ref>.
** Fasting [[insulin]] levels can confirm [[hyperinsulinemia]] and [[insulin resistance]]
* Liver biopsy remains the gold standard for diagnosing NASH and assessing the degree of [[fibrosis]] in patients with NAFLD. A liver biopsy can also assist decide the severity of inflammation, detect liver [[scarring]] ([[fibrosis]] or, when extreme, [[cirrhosis]]), and may provide clues approximately the future direction of the circumstance<ref name="urlNonalcoholic fatty liver disease (NAFLD), including nonalcoholic steatohepatitis (NASH)">{{cite web |url=https://www.uptodate.com/contents/nonalcoholic-fatty-liver-disease-nafld-including-nonalcoholic-steatohepatitis-nash-beyond-the-basics |title=Nonalcoholic fatty liver disease (NAFLD), including nonalcoholic steatohepatitis (NASH) |format= |work= |accessdate=}}</ref>.
* [[Lipid]] levels ( serum [[cholesterol]] and fasting [[triglycerides]] ) should be evaluated
* Moreover, biopsy-tested NASH patients also are candidates for greater competitive lifestyle interventions, with the intention to reduce the risk of destiny [[cardiovascular]] and liver disorder progression.
** [[Dyslipidemia]], beside being a very common finding in NAFLD, is a risk factor that can be modified by dietary and/or pharmacologic intervention.
* [[Biomarkers]] and clinical prediction regulations for refining the control paradigm of NAFLD are rising. [[Metabolic syndrome]] and [[diabetes]] are the key determinants of superior histological examinations in NAFLD.
* Iron studies (in particular elevated [[ferritin]] and transferring saturation) are often abnormal in NAFLD
* Consequently, a liver [[biopsy]] may be considered in this subset of patients with NAFLD.
* Some patients with NAFLD may have low titers of [[Autoimmune disease|autoimmune]] [[antibodies]].
* Until similar refinement of [[biomarkers]] and scientific prediction regulations, liver biopsy has to be taken into consideration in patients with NAFLD who have an increased danger of advanced [[fibrosis]] and when the [[prognosis]] is unsure.  
* [[Biomarkers]]
* Incremental advances in the [[noninvasive]] analysis of NASH will preserve to form the management [[paradigm]] of NAFLD and will alternate scientific practice in the coming years.
** CK18 represents a promising [[biomarker]] for evaluation of the presence of NASH.
 
** A defining characteristic of NASH is [[cellular]] death, and [[serum]] CK18 levels had been shown to correlate with [[steatohepatitis]].  
==CK 18==
CK18 represents a promising [[biomarker]] for evaluation of the presence of NASH. A defining characteristic of NASH is [[cellular]] death, and [[serum]] CK18 levels had been shown to correlate with [[steatohepatitis]] in numerous trials.CK18 can constitute a cost-effective diagnostic tool


==References==
==References==

Revision as of 19:08, 22 December 2017

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Vamsikrishna Gunnam M.B.B.S [2]

Overview

There are no specific diagnostic laboratory findings associated with non alcoholic fatty liver disease. Laboratory findings include abnormal liver function tests but are unspecific. Other laboratory tests are generally performed to rule out other diagnosis.

Laboratory Findings

  • There is no specific laboratory findings diagnostic for non alcoholic fatty liver disease.[1][2]
  • Liver function tests
    • Typical finding include a 2-4 fold elevation of the ALT 
    • An ALT/AST ratio of greater than 1.

References

  1. "Nonalcoholic fatty liver disease: Indications for liver biopsy and noninvasive biomarkers - Noureddin - 2012 - Clinical Liver Disease - Wiley Online Library".
  2. "Nonalcoholic fatty liver disease (NAFLD), including nonalcoholic steatohepatitis (NASH)".

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