Which specimen uses a yellow top SAF fixative container?

Which specimen uses a yellow top SAF fixative container?

• A. Stool parasite/ova collection
• B. Bacterial stool culture collection
• C. Midstream urine collection
• D. Blood culture collection

Answer: (A)

The key idea is choosing a preservative that keeps the target organisms intact until they can be examined. SAF fixative is used specifically to preserve stool parasites—eggs, cysts, and trophozoites—for microscopic identification. The yellow-top container is the standard label for this fixative, which stabilizes morphology and prevents degradation during transport. That’s why a yellow-top SAF fixative container is paired with stool parasite/ova collection. Other specimen types require different handling: bacterial stool culture needs a sterile container to keep organisms viable for culture; midstream urine relies on a sterile container to avoid contamination and allow accurate analysis; blood culture uses specialized bottles with broth that support growth of any bacteria present, not a fixative.

The key idea is choosing a preservative that keeps the target organisms intact until they can be examined. SAF fixative is used specifically to preserve stool parasites—eggs, cysts, and trophozoites—for microscopic identification. The yellow-top container is the standard label for this fixative, which stabilizes morphology and prevents degradation during transport. That’s why a yellow-top SAF fixative container is paired with stool parasite/ova collection.

Other specimen types require different handling: bacterial stool culture needs a sterile container to keep organisms viable for culture; midstream urine relies on a sterile container to avoid contamination and allow accurate analysis; blood culture uses specialized bottles with broth that support growth of any bacteria present, not a fixative.