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Recommendations for handling radioactive specimens obtained by sentinel lymphadenectomy. Surgical Pathology Committee of the College of American Pathologists, and the Association of Directors of Anatomic and Surgical Pathology.

Sentinel lymph node biopsy has been shown to be an accurate predictor of axillary nodal status in invasive breast cancer and is a useful alternative to axillary dissection for some patients. Because radioactive materials are often used to identify the sentinel lymph node, concerns have been raised regarding the safe handling of tissue specimens obtained by this technique. The Surgical Pathology Committee of the College of American Pathologists and the Association of Directors of Anatomic and Surgical Pathology have developed recommendations for the safe handling of radioactive specimens obtained by sentinel lymphadenectomy.

Axilla↗

Understanding the mechanisms creating false positive lumpectomy margins.

OBJECTIVE: All breast surgeons deal with the frustration of initial pathologic close or positive margins that have no residual cancer upon re-excision. To understand the mechanisms that create false positive margins, specimen handling was standardized in a single surgeon's practice and margin issues were tracked. METHODS: Prospectively over a 3.5-year period, needle-localized lumpectomies for the management of early-stage breast cancer were standardized in all aspects of specimen handling, including surgeon inking and specimen compression for specimen radiography for quality assurance. The current study reviews 220 such cases where the original lumpectomy included a small piece of overlying skin from over the target lesion. All specimen radiography was performed with compression at the skin to deep level to bias the "pancaking" effect of pushing tumor to specimen surface to the deep margin. RESULTS: Of the 220 therapeutic lumpectomies performed for clinical stage 0-2 breast cancer in this fashion, 175 (79.5%) had negative margins by a distance of 10 mm or more. Margins less than 10 mm were classified as close and were present in 20 (9.1%) of cases. These were heavily biased toward margins closer than 2 mm. Positive initial margins accounted for 25 (11.4%) of cases. Of the 45 close or positive margin cases, 12 involved the deep margin only, and on re-excision none was found to have residual tumor. When other single margins were involved, re-excision found tumor in 5 of 14 cases (35.7%). When multiple margins were close or positive, 9 of 19 cases (47.3%) were found to have residual tumor at re-excision. CONCLUSIONS: Specimen compression increases the incidence of false margin positivity. The best predictors of true margin positivity are multiple close or positive margins or margin positivity in a direction not associated with specimen ex vivo compression.

Breast Neoplasms↗

Effects of non-analytical factors on the quality of laboratory results.

The quality of clinical laboratory measurement is comprised of 2 phases, the analytical and non-analytical phases. Nowadays, a well established quality control system has been applied. However, the non-analytical phase is a state of the art that must be paid attention to. We studied the non-analytical (pre- and post-) factors. A questionnaire was distributed to 298 hospital laboratories whom participated in the External Quality Assessment Scheme in Clinical Chemistry (EQAC) program of Faculty of Medical Technology, Mahidol University. The respondent rate was 71%. Most of the responder was female with a bachelor degree in medical technology or equivalent, who was the chief of the laboratory. Results shows that patient preparation, patient identification, specimen acquisition, specimen handling, and documentary system (specimen recording and result reporting) were important consideration factors. The turnaround time was also a main issue. Verification of test results was an important process too. Finally, as a good laboratory practice, one must has the strategies to detect and eliminate the non-analytical errors.

Clinical Laboratory Techniques↗

Neuroblastoma and peripheral neuroectodermal tumors.

Peripheral neuroblastic tumors in childhood present unique problems in terms of diagnosis, classification, and histologic determinants of prognosis. The proper specimen handling of these neoplasms requires integration of gross and microscopic pathologic examination along with cytogenetic, immunohistochemical, and electron microscopy studies. The appropriate gross examination and processing of these tumors are described with particular emphasis on ancillary studies. Important special studies such as immunohistochemistry, flow cytometry, and genetic and molecular oncologic investigation are stressed, and the appropriate methods of processing materials for these studies are discussed. The handling of small biopsy specimens, fine-needle aspirates, or both is also addressed. The staging of neuroblastoma varies according to Pediatric Oncology Group and Children's Cancer Study Group systems, and the importance of obtaining appropriate information to satisfy either system is noted. Ancillary information for classification of neuroblastoma and related neoplasms is also presented.

Adolescent↗

Gone but not forgotten: the search for the lost surgical specimens: application of quality improvement techniques in reducing medical error.

A lost surgical specimen prompted an investigation of both the human processes and the systemic factors involved in surgical specimen handling regarding how health care organizations approach medical error prevention and patient safety promotion. Quality improvement techniques and the conceptual error model of James Reasons were employed to understand the interaction between the local process of specimen handling and the systemic influences to medical error management. Error management recognizes the inevitability of both individual and systemic error. Through the use of quality improvement techniques and models of error analysis, health care organizations can investigate the error potential of health care delivery and address the human and organizational interaction necessary to improve patient safety and manage medical error.

Hospitals, Veterans↗

A new procedure for handling impervious biological specimens.

A new application of techniques for preparing impervious biological specimens for light microscopy (LM) and transmission electron microscopy (TEM) has been developed. Microwave irradiation was used to facilitate fixation. A priming technique was used to increase the bonding of the outer surface of the specimens with the resin. Priming the waxy or cuticular surface with Z-6040 (gamma-glycidoxypropyl trimethoxysilane) solved the problem of specimen "pull out" from the resin. Insect specimens with various types of cuticles (waxy or chitinous) and seeds were successfully studied ultrastructurally using this technique.

Animals↗

Immunohistochemical demonstration of altered intracellular localization of the C-Myc oncogene product in human colorectal neoplasms.

The distribution of the c-myc oncogene product p62 was examined by immunohistochemistry using the monoclonal antibody Mycl-9E10 in a series of 50 colorectal resections for carcinoma. The specimens were specially handled to ensure rapid fixation in formalin, and a significant improvement was shown in the quality and localization of staining compared with routinely handled specimens. Non-neoplastic mucosa showed the presence of nuclear staining of epithelial cells in 93 per cent of the samples, whilst all carcinomas showed cytoplasmic staining and infrequent nuclear staining. Adenomas showed an intermediate pattern, with significantly more frequent cytoplasmic distribution than non-neoplastic mucosa, but less than carcinomas. The results show that whilst fixation conditions are important in the immunolocalization of the c-myc protein product, there may be a consistent difference between non-neoplastic mucosa and carcinoma in the manner of association of p62 with the nucleus.

Carcinoma↗

[Structure of the endothelium of the thoracic and abdominal aorta of intact rats studied by various methods of preparation and handling of the specimens].

By means of scanning and transmissive electron microscopy structural peculiarities of endothelium of the thoracic and abdominal parts of the intact rat aorta have been studied at various regimens of preparation and making specimens . The greatest changes endotheliocytes (EC) undergo at using immersion fixation after dissection of the aortal segments. These changes are less pronounced at immersion fixation in situ. A decreased perfusion pressure results in appearance of intimal folds and microfolds on the surface of EC. Increasing time for washing more than 1 min results in appearance of inflations and craters on the surfice of EC. For analysis by means of transmissive electron microscopy it is not necessary to remove blood completely out of the vascular bed. The most essential factor is to maintain perfusion pressure at the average systolic level in the given area of the vessel. However, to make the analysis by means of scanning electron microscopy this method is not suitable. The most optimal condition for initial stages of preparing vessels for morphological investigation is their washing for 1 min in the medium 199 with addition of heparin (10 units/ml) during no more than 1 min with a subsequent perfusive fixation in 2.5% solution of glutaraldehyde in the medium 199 no less than 5 min under the average arterial pressure in the given area of the vessel.

Animals↗

Handling of blood specimens for glucose analysis.

There is no consensus concentration of sodium fluoride (NaF) required for preserving glucose in blood specimens. We examined the effectiveness of different concentrations of NaF. Glucose concentration in blood samples decreased with time, despite the presence of a high concentration of NaF (12 g/l). The decrease in glucose concentration was less with increasing amounts of NaF but could not be totally abolished. The clinical implications of these pre-analytical errors is discussed.

Adult↗

Influences of specimen processing and storage conditions on results for plasma ammonia.

Ammonia concentrations in plasma may increase because of contamination and deterioration of blood components during specimen handling and storage. Using replicate specimens from healthy volunteers, we studied influences of specimen processing and storage procedures on ammonia measurements made with a self-contained reagent system. Under some conditions, ammonia concentrations more than doubled. The use of nonhemolyzed plasma specimens and prompt centrifugation, separation of plasma, and ammonia determination apparently were important in avoiding such increases, the duration of contact between plasma and cells being the most important factor. Lower temperatures had minimal effect on whole-blood storage and centrifugation, but retarded increases in ammonia in stored plasma. We conclude that procedures for collection and storage of specimens for ammonia determinations should be standardized and strictly observed.

Ammonia↗

Surgical pathology specimen identification and accessioning: A College of American Pathologists Q-Probes Study of 1 004 115 cases from 417 institutions.

OBJECTIVE: To examine and suggest improvements for deficiencies occurring in the specimen identification and accessioning process in the surgical pathology laboratory. DESIGN: Using the College of American Pathologists' and the Joint Commission for Accreditation of Healthcare Organizations' requirements as the standard, each laboratory was asked to prospectively document deficiencies in specimen identification and accessioning for 4 months, or until a maximum of 4000 cases or 400 deficiencies were accrued. PARTICIPANTS: Four hundred seventeen laboratories in the College of American Pathologists' voluntary quality improvement program, Q-Probes, participated in this study. RESULTS: Identification and accessioning deficiencies were found in 60 042 (6%) out of a total 1 004 115 cases accessioned (median deficiency rate of 3.4%). Errors related to specimen identification accounted for 9.6% of these deficiencies, discrepant or missing information items were present in 77%, and 3.6% involved specimen handling. The most common deficiency was "no clinical history or diagnosis present on the requisition slip," which represented 40% of all deficiencies. Deficiencies were most often detected by the person assigned to accessioning duties or by histology personnel. In 66% of cases, no action was taken to remedy the deficiency, but this varied dramatically according to the specific type of deficiency. An action was taken to remedy deficiencies in 69% of cases involving specimen identification errors, in 58% of specimen handling errors, and in 27% of cases with discrepant or missing information. Peer group stratifiers were associated with a lower deficiency rate. Laboratories with lower numbers (<15 000) of accessioned cases and laboratories with a formal written plan for the detection of errors in accessioning and specimen identification reported lower rates of deficiencies. Factors that correlated with a higher rate of deficiencies included submitting the specimen container and requisition slip in a unique secondary container (P<.005) and labeling the specimen container with only a patient's name or unique patient identification number (as opposed to both identifiers). CONCLUSIONS: The majority of deficiencies occurring in surgical pathology specimen identification and accessioning are related to missing or inaccurate clinical information. Deficiencies are detected in multiple locations, including areas not typically thought of as quality check points, such as transcription. A variable amount of effort occurs to rectify deficiencies; this effort is largely dependent on the type of deficiency involved. Finally, laboratories with a formal error detection plan had fewer deficiencies.

Humans↗