Understanding "Source" in Pathology Reports
"Source" in a pathology report refers to the anatomic site or location from which the specimen was removed—essentially, where the tissue came from in your body.
What "Source" Means
The term "source" indicates the precise anatomical location of the tissue that was excised. This is a critical element of specimen identification and proper pathology reporting. According to standardized pathology reporting guidelines, the source encompasses 1:
- The specific anatomic location (e.g., right breast upper outer quadrant, carotid body, urinary bladder)
- Laterality (right or left side)
- The organ or tissue type from which the specimen originated
Why This Matters
The source designation serves multiple essential functions:
- Proper specimen identification: Ensures the tissue is correctly attributed to the right anatomical location in your body
- Accurate diagnosis: Different tissues have different normal appearances and disease patterns
- Treatment planning: The location affects surgical approach, radiation fields, and prognosis
- Prevents errors: Specimen mislabeling, though rare (occurring in approximately 0.25% of cases), can have serious consequences 2
What "Source" Is NOT
The source does not refer to:
- What type of tissue was removed (that's the "specimen type")
- How much was removed (that's the "specimen size")
- The surgical procedure performed (that's documented separately as "procedure")
Practical Example
If you had a breast biopsy, the source might read: "Left breast, upper outer quadrant" 3. This tells everyone exactly where in your body the pathologist is examining tissue from, which is distinct from describing what was removed (e.g., "core needle biopsy" or "excisional biopsy").
The pathology report should ideally be given to the pathologist by the surgical team with appropriate orientation and identification of the source location 1.