Sunday 6 January 2013

Diagnosis of Tyrosinemia [TYPE 1]

Besides knowing the symptoms and complications, we must also make sure we know HOW to confirm that a patient has gotten a certain disease. I mean, a wrong diagnosis would be pretty awful right? If the diagnosis is wrong, it is highly likely that treatment would be wrong and thus ineffective too. 
THAT IS VERY BAD LEH.  :<
So here we have, the supposed biochemical results of a tyrosine type I patient.

Testing for tyrosinemia in the laboratory gives the following biochemical results:
  • High levels of succinylacetone in blood (dried blood spots), plasma and urine
  • High concentrations of tyrosine, methionine and phenylalanine in plasma
  • High levels of tyrosine metabolites in urine
  • High levels of alpha-feto protein
  • Liver function tests shows abnormality
  • FAH assays of liver biopsy, skin fibroblasts or dried blood spots
  • Low serum albumin and clotting factors
  • Elevated transaminase levels
  • Increased bilirubin levels
Newborn Screening Methods
  • Concentration of tyrosine or methionine in blood
  • Measuring succinylacetone directly from dried blood spots by tandem mass spectrometry (more sensitive and specific)
  • Assay of Delta-Ala-dehydratasse (PBG synthase) enzyme activity
Prenatal Diagnosis
  • By performing mutation analysis on Chorionic Villus Sampling (CVS) or amniocytes
  • FAH assay on CVS or amniocytes
  • Measurement of succinylacetone levels in amniotic fluid
To all future doctors,
Please do not make a mistake in diagnosis! >.<
Must triple check all the results okay! 
Sigh, back to school tomorrow! :(

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