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Unit Code 81252:
Zygosity Testing (Multiple Births)

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Useful For

Determining genetic risk for an individual whose twin/triplet

is affected with a genetic disorder for which a specific genetic

test is not available (or such testing is uninformative)

 

Assessment of risks prenatally when 1 fetus of multiples is known

to be affected by a specific disorder

 

Organ or bone marrow transplantation compatibility testing

 

Familial/parental interest  

Reflex Tests

 Unit Code  Reporting Name  Available Separately  Always Performed 
80333 Fibroblast Culture for Genetic Test Yes No
80334 Amniotic Fluid Culture/Genetic Test Yes No

Testing Algorithm

If amniotic fluid (non-confluent cultured cells) is received, amniotic

fluid culture/genetic test will be added and charged separately.  If

chorionic villus specimen (non-confluent cultured cells) is received,

fibroblast culture for genetic test will be added and charged separately.

Testing Guides and Forms

• Molecular Genetics - Congenital Inherited Diseases Patient Information Sheet 

Method Name

Polymerase chain reaction (PCR)/microsatellite markers
are used to provide a genotype for multiples and their
parents to determine if siblings are monozygotic twins.
(PCR is utilized pursuant to a license agreement with

Roche Molecular Systems, Inc.)

Reporting Name

Zygosity Testing (Multiple Births)

Ordering Mnemonic

ZYG

Aliases

Identical Twins

Multiple Births

Triplets

Twins

Key