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​Indic​ations

Rapid screening for trisomy 13, 18, and 21, X and Y in an at risk pregnancy, in conjunction with amniotic fluid​, chorionic villi, or percutaneous umbilical blood chromosome analysis

Rapid screening for trisomy 13, 18, and 21, X and Y in a critically ill newborn, in conjunction with standard blood chromosome analysis

Methodo​logy

FISH studies involve scoring of hybridization signals using chromosome-specific DNA probes on interphase nuclei.

Specimen Re​quirements

Since Trisomy Screen by FISH is performed in conjunction with chromosome analysis, no additional specimen is usually required. See specimen requirements for appropriate chromosome analysis.

Check "Trisomy screen by FISH and chromosome analysis" on the Test Request Form​​.

Turn​ Around Time

Results are generally available in 24-48 hours after the sample has been submitted.