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Genetic Labs

Houston, Texas

Genetic Laboratory
Baylor Genetics Laboratories
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Medical Genetics Test Details

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The American Medical Association (AMA) Current Procedural Terminology (CPT) codes and Healthcare Common Procedure Coding System (HCPCS) codes listed, are provided for informational purposes only. The codes reflect our interpretation of CPT/HCPCS coding requirements based upon AMA guidelines published annually. CPT/HCPCS codes are provided only as guidance to assist clients with billing. Baylor Genetics strongly recommends that clients confirm CPT/HCPCS codes with their Medicare Administrative Contractor (MAC) or other payer being billed, as requirements may differ. CPT coding is the sole responsibility of the billing party. Baylor Genetics assumes no responsibility for billing errors due to reliance on the CPT codes listed. Please direct any questions regarding CPT coding to the payer being billed.


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Mitochondrial DNA Content (qPCR) Analysis - Liver
Test Information: Mitochondrial DNA (mtDNA) Content Quantification determines if mtDNA depletion is present in the sampled tissue. The mtDNA content measurement, together with the clinical features, facilitates the selection of causative nuclear genes for sequence analysis.

Mitochondrial DNA depletion is a heterogeneous group of disorders characterized by the reduction of mtDNA content in affected tissues. Affected patients usually present in infancy with hypotonia, lactic acidemia, encephalopathy, hepatopathy, or myopathy. Mutations in at least 10 nuclear genes are known to cause various forms of mtDNA depletion syndromes, including severe infantile hepatic, hepatocerebral, myopathic, or encephalomyopathic forms.

Reasons for Testing:

Suspicion of mtDNA depletion syndrome
Test Details
Test Code: 3720
Special Notes: mtDNA Content (qPCR) Analysis can be performed on Skeletal Muscle (#3700). We recommend ordering mtDNA Content (qPCR) Analysis with ETC Enzyme Analysis (#3200) on Skeletal Muscle. If performed together, please send 100mg Skeletal Muscle. Please see detailed requirements under each test code.

Technical Information
Methodology: The mtDNA and nuclear DNA (nDNA) contents are determined by real-time quantitative PCR using specific primers for the mitochondrial tRNALeu(uur) gene and the nuclear ß-2-microglobulin (ß2M) gene. The mtDNA copy number is calculated from the difference in threshold cycle numbers of mtDNA and nDNA.
Sample & Shipping Information
Test Requisition: Mitochondrial
Specimen Type: Liver
Requirements: 25 mg for liver mtDNA Content (qPCR) Analysis
Shipping Conditions: Liver should be flash frozen in liquid nitrogen at collection with no media added, stored at -80C, and shipped by overnight courier on 3-5 lbs of dry ice.
Turn Around Time: 21 days
Billing Information
List Price: *For Insurance or Institutional Prices, please call.
CPT Codes: 81479x1


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