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December 2023

And the band neutrophil counts play on​

December 2023—The recent CAP proficiency testing questionnaire was meant to be the coup de grâce. Hematology PT participants were asked about their band neutrophil reporting practices and, given that these manually generated counts were supposedly on their way out decades ago, the authors of the survey questionnaire expected to see very little activity. The survey, they hoped, would be a way to pound the final, data-driven nail in the coffin. Or, as lead author Maria (Ria) Vergara-Lluri, MD, puts it, “We thought this had all been laid to rest 30 years ago.” It wasn’t. Says Dr. Vergara-Lluri: “Surprise: 86 percent of labs that participated still report bands.” The results of the survey upended many of the assumptions, if not hopes, the authors might have had. Among laboratories that reported manual differentials, they found that most reported bands (4,554 of 5,268). Moreover, only 73 percent reported band reference ranges. On the morphologic challenge, bands classified as “easy” were indeed easy—participants classified them well.

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LDT proposal on the radar—little detail, clarity needed

December 2023—For most, laboratory staffing woes continue, despite some letup post-pandemic. CAP TODAY publisher Bob McGonnagle on Nov. 7 got a sampling of where staffing stands as the year end approaches, in his conversation online with members of the Compass Group, an organization of not-for-profit IDN system lab leaders who collaborate to identify and share best practices and strategies. But first a few words from them about the Food and Drug Administration’s proposed rule on laboratory-developed tests.

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AMP case report: Potential von Hippel-Lindau syndrome in a patient with negative germline testing

CAP TODAY and the Association for Molecular Pathology have teamed up to bring molecular case reports to CAP TODAY readers. AMP members write the reports using clinical cases from their own practices that show molecular testing’s important role in diagnosis, prognosis, and treatment. The following report comes from Washington University School of Medicine in St. Louis. If you would like to submit a case report, please send an email to the AMP at amp@amp.org. For more information about the AMP and all previously published case reports, visit www.amp.org.

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From the President’s Desk

December 2023—About five years ago, when I was serving in my first term on the CAP Board of Governors, I attended a House of Delegates meeting where we had a candidate forum with several people on stage competing for just a few Board slots. Of the half-dozen or so people, only one or two were women and none was a minority. That’s when one delegate stood up and, with a single question, altered the course of our entire organization: “When will the CAP have candidates for higher office who look like the CAP membership?”

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Anatomic pathology selected abstracts

December 2023—Cytomegalovirus hepatitis in allograft livers is a significant infectious complication for which the histology historically has been described as overlapping that of acute cellular rejection, a diagnosis that compels a different treatment regimen. The authors conducted a study to update the clinicopathologic features of cytomegalovirus (CMV) hepatitis and explore its clinical and histologic relationship with acute cellular rejection (ACR). They performed a retrospective analysis of 26 patients, across four institutions, who were diagnosed with CMV hepatitis, assessing clinical, histologic, and IHC features. Patients were predominantly CMV donor positive/recipient negative (D+/R-; n=9 of 15) and received a diagnosis of CMV hepatitis at a mean age of 52 years (standard deviation [SD], 17 years) and at a mean interval of 184 days (SD, 165 days) from transplantation. Mean CMV viral load at diagnosis was 241,000 IU/mL (SD, 516 000 IU/mL), and liver biochemical enzymes were elevated (mean alanine aminotransferase, 212 U/L [SD, 180 U/L]; mean aspartate aminotransferase, 188 U/L [SD, 151 U/L]; and mean alkaline phosphatase, 222 U/L [SD, 153 U/L]).

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Clinical pathology selected abstracts

December 2023—Efforts to develop biomarkers that help predict risk factors for preeclampsia/eclampsia and to better understand the trends and implications related to new-onset hypertensive disorders in pregnancy have grown. New-onset hypertension arising during pregnancy (gestational hypertension and preeclampsia/eclampsia) is associated with coronary heart disease, heart failure, stroke, and other cardiovascular-related mortality. Hypertensive disorders of pregnancy have grown into major public health problems that contribute to maternal morbidity, mortality, and future risk of cardiovascular disease. The authors conducted a study to describe contemporary trends in new-onset hypertensive disorders of pregnancy in the United States. They conducted a serial cross-sectional analysis of 51,685,525 live births to women aged 15 to 44 years, from 2007 to 2019, using the Centers for Disease Control and Prevention’s natality database.

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Molecular pathology selected abstracts

December 2023—Immune checkpoint blockade therapy has dramatically altered treatment options for a variety of cancers. A high tumor mutation burden (TMB) is considered one of the strongest predictors of immune checkpoint blockade response. DNA mismatch repair deficiency (MMRd) is associated with a high TMB, and many tumors associated with MMRd have shown excellent response to immunotherapy. However, most MMRd tumors do not show durable response to treatment with immune checkpoint blockade (ICB). Intratumor heterogeneity may further mediate response to ICB therapy.

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Q&A column

December 2023 Q. When using a sodium citrate blue-top tube due to platelet clumping, should the sample be kept warm, and does it have to be run within a certain time frame? Read answer. Q. Does the CAP require instrument-to-instrument comparability studies at least twice a year for waived point-of-care testing instruments, such as glucose meters, or nonwaived instruments, such as critical care analyzers? Are we required to perform a linearity study twice a year on all waived and nonwaived POC testing instruments? Read answer.

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In memoriam

Dr. Duckworth

John Kelly Duckworth, MD 1928–2023 December 2023—John Kelly Duckworth, MD, a member of the CAP Board of Governors from 1987 to 1993, died on Sept. 14 at age 95. Dr. Duckworth was the second chair of the CAP Commission on Laboratory Accreditation. He also was chair of the Council on Practice Management, vice chair of the Council on Scientific Affairs, ...

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