In PAS staining, a streaming artifact seen due to cold fixation is observed. What is this artifact called?

Study for the CAMLPR Histology Practice Test. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

In PAS staining, a streaming artifact seen due to cold fixation is observed. What is this artifact called?

When fixation happens at a cold temperature, the tissue can deform in a way that creates directional, streak-like patterns during staining. This is a known artifact in PAS sections called a streaming artifact from cold fixation. It appears as elongated, threadlike streams of stain that run in a particular direction, reflecting the uneven fixation and movement of tissue components during processing. Why this is the best answer: the term explicitly names the artifact and its cause, matching the observed phenomenon in PAS staining when cold fixation is involved. Other common artifacts listed (drying, air bubbles, section tearing) are physical or handling issues and are not tied to the specific streaming pattern caused by cold fixation. To minimize it, fix tissues at appropriate temperatures with fresh fixative and ensure consistent processing.

When fixation happens at a cold temperature, the tissue can deform in a way that creates directional, streak-like patterns during staining. This is a known artifact in PAS sections called a streaming artifact from cold fixation. It appears as elongated, threadlike streams of stain that run in a particular direction, reflecting the uneven fixation and movement of tissue components during processing.

Why this is the best answer: the term explicitly names the artifact and its cause, matching the observed phenomenon in PAS staining when cold fixation is involved.

Other common artifacts listed (drying, air bubbles, section tearing) are physical or handling issues and are not tied to the specific streaming pattern caused by cold fixation. To minimize it, fix tissues at appropriate temperatures with fresh fixative and ensure consistent processing.

More practice questions