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Advanced Technical IVT

Sperm Chromatin Structure Assay

Also written as: SCSA — Sperm Chromatin Structure Assay

Laboratory test measuring sperm DNA fragmentation and chromatin quality. Uses flow cytometry to assess DNA integrity.

Full Definition

A specialized laboratory test that evaluates sperm chromatin structure and DNA integrity using flow cytometry and acid denaturation. The assay measures the susceptibility of sperm DNA to acid-induced denaturation, providing information about DNA fragmentation index (DFI) and high DNA stainability (HDS). Elevated DFI values are associated with reduced fertilization rates, poor embryo quality, increased miscarriage rates, and failed assisted reproduction cycles. The test is particularly useful in cases of unexplained infertility, recurrent pregnancy loss, or repeated ART failures. Normal DFI values are typically below 15%, with values above 30% indicating significant DNA damage.

Usage

Usage note: Distinguish from basic sperm analysis parameters; this test specifically measures DNA quality.

In Context

  • "The sperm chromatin structure assay revealed a DFI of 35%, suggesting significant DNA fragmentation." — Laboratory report
  • "SCSA testing was ordered after three failed IVF cycles to evaluate sperm DNA quality." — Investigation protocol

Also known as

SCSA sperm DNA fragmentation test chromatin structure assay

Don't confuse with

sperm DNA integrity sperm aneuploidy testing

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