Indications For Patau syndrome (trisomy 13)
Patau syndrome, also known as trisomy 13, is a syndrome in which a patient has an additional chromosome 13,
Patau syndrome symptoms include:
Mental & motor retardation
Polydactyly (extra digits)
Holoprosencephaly (failure of the forebrain to divide properly).
Structural eye defects, including microphthalmia, Peters anomaly, cataract, iris and/or fundus (coloboma), retinal dysplasia or retinal detachment, sensory nystagmus, cortical visual loss, and optic nerve hypoplasia
Meningomyelocele (a spinal defect)
Omphalocele (abdominal defect)
Abnormal palm pattern
Overlapping of fingers over thumb.
Cutis aplasia (missing portion of the skin/hair)
Cleft palate or hare lip
• Amniotic fluid
Discard the first 2 cc of fluid to reduce the risk of maternal cell contamination. Aseptically transfer 15-20 cc into sterile plastic conical tubes labeled with patient’s name and date of birth.
Aseptically transfer 5-10mg into sterile plastic conical tubes containing sterile transport medium. Label tube with patient’s name and date of birth.
• Peripheral blood
Collect 5-10 cc whole blood in a green top tube (sodium heparin). Label tube with patient’s name and date of birth.
A completed test requisition form must be included with every sample. A transport kit is available upon request.
Labortory testing for Patau syndrome testing can be performed as a SAT 24 hour FISH study on interphase cells followed by complete cytogenetic analysis (karyotype)
Room temperature (DO NOT refrigerate, freeze or centrifuge)
24-hour laboratory testing for Patau Syndrome (trisomy 13) can be performed by Fluorescence in situ hybridization on interphase nuclei followed by confirmatory cytogenetic analysis.
Causes for Rejection
Frozen specimen, inappropriate container
FISH: 24 hours
Cytogenetic analysis: 7-10 days