Predictive Value of Diagnostic Tests and Prevalence of Invasive Entamoeba histolytica Infection

1993 ◽  
Vol 168 (2) ◽  
pp. 513-514 ◽  
Author(s):  
A. Gonzalez-Ruiz ◽  
M. A. Miles ◽  
D. C. Warhurst
Keyword(s):  
Entamoeba Histolytica ◽  
Predictive Value ◽  
Diagnostic Tests ◽  
Histolytica Infection

scholarly journals A Comparative Analysis of Microscopy, Coproantigen Serology, and Nested Multiplex PCR in the Laboratory Diagnosis of Entamoeba histolytica Infection

2021 ◽  
Author(s):  
Sindhusuta Das ◽  
Nonika Rajkumari ◽  
Anitha Gunalan ◽  
Dhanalakshmi Rajavelu ◽  
Jeby Jose Olickal
Keyword(s):  
Multiplex Pcr ◽  
Entamoeba Histolytica ◽  
Predictive Value ◽  
Parasitic Infection ◽  
Laboratory Diagnosis ◽  
Enzyme Linked Immunosorbent Assay ◽  
Kappa Statistics ◽  
Histolytica Infection ◽  
Intestinal Amoebiasis ◽  
Stool Samples

Abstract Objectives Amoebiasis is caused by the most common intestinal protozoan parasite Entamoeba histolytica. This parasite causes amoebic colitis, which is manifested by diarrhea, followed by dysentery. The laboratory diagnosis of intestinal amoebiasis in most cases is by microscopic examination of stool samples. Other nonroutine methods include coproantigen enzyme-linked immunosorbent assay (ELISA) from stool samples, serum ELISA for antibodies, stool culture, isoenzyme analysis, and polymerase chain reaction (PCR). The present study aimed to comparatively analyze the different diagnostic modalities used for the detection of E. histolytica from the stool sample of patients with intestinal amoebiasis. Materials and Methods This study was undertaken with 631 patients, during a period of 3 years, from January 2017 to December 2019. Stool specimen obtained from each patient was subjected to direct microscopic wet mount examination, coproantigen ELISA, and nested multiplex PCR, respectively. Results Out of all the patients tested, 5.2% were positive for E. histolytica. Among the positive cases, stool microscopy was positive in 3.17%, coproantigen ELISA was positive in 29 (4.6%) cases, and PCR was positive in 30 (4.75%) cases. Statistical Analysis The prevalence of E. histolytica infection was summarized as percentages. The three diagnostic tests done were statistically analyzed, taking microscopy as the gold standard. The agreement between techniques (microscopy, coproantigen ELISA, and PCR) was analyzed with kappa statistics. Sensitivity, specificity, positive predictive value, negative predictive value, and diagnostic accuracy were summarized as percentage with 95% confidence interval. Conclusion In all suspected amoebiasis cases, a combination of stool microscopy, coproantigen testing with molecular detection of the parasite offers the best approach to diagnosis of this parasitic infection.

scholarly journals Use of β-D-glucan in diagnosis of suspected Pneumocystis jirovecii pneumonia in adults with HIV infection

2021 ◽  
pp. 095646242110222
Author(s):  
Thomas Juniper ◽  
Chris P Eades ◽  
Eliza Gil ◽  
Harriet Fodder ◽  
Killian Quinn ◽  
...  
Keyword(s):  
Predictive Value ◽  
Diagnostic Tests ◽  
Elevated Serum ◽  
Clinical Information ◽  
High Sensitivity ◽  
Pneumocystis Pneumonia ◽  
Pneumocystis Jirovecii Pneumonia ◽  
Alternative Diagnosis ◽  
Positive Threshold ◽  
Sensitivity Specificity

Objectives: An elevated serum (1-3)-β-D-glucan (BDG) concentration has high sensitivity for a diagnosis of Pneumocystis pneumonia (PCP) in people with HIV (PWH). At the current manufacturer-recommended positive threshold of 80 pg/mL (Fungitell), specificity for PCP is variable and other diagnostic tests are required. We evaluated the utility of serum BDG for diagnosis of suspected PCP in PWH at three inner-London hospitals to determine BDG concentrations for diagnosis and exclusion of PCP. Methods: From clinical case records, we abstracted demographic and clinical information and categorised patients as having confirmed or probable PCP, or an alternative diagnosis. We calculated sensitivity, specificity and positive predictive value (PPV) of serum BDG concentrations >400 pg/mL and negative predictive value (NPV) of BDG <80 pg/mL. Results: 76 patients were included; 29 had laboratory-confirmed PCP, 17 had probable PCP and 30 had an alternative diagnosis. Serum BDG >400 pg/mL had a sensitivity of 83%, specificity of 97% and PPV 97% for diagnosis of PCP; BDG <80 pg/mL had 100% NPV for exclusion of PCP. Conclusions: In PWH with suspected PCP, BDG <80 pg/mL excludes a diagnosis of PCP, whereas BDG concentrations >400 pg/mL effectively confirm the diagnosis. Values 80–400 pg/mL should prompt additional diagnostic tests.

scholarly journals Eotaxins and Their Receptor as Biomarkers of Colorectal Cancer

2021 ◽  
Vol 10 (12) ◽  
pp. 2675
Author(s):  
Monika Zajkowska ◽  
Agnieszka Kulczyńska-Przybik ◽  
Maciej Dulewicz ◽  
Kamil Safiejko ◽  
Marcin Juchimiuk ◽  
...  
Keyword(s):  
Colorectal Cancer ◽  
Negative Predictive Value ◽  
Predictive Value ◽  
Diagnostic Tests ◽  
Diagnostic Utility ◽  
Healthy Controls ◽  
Serum Concentrations ◽  
Chemiluminescent Microparticle Immunoassay ◽  
Sensitivity Specificity ◽  
Immunoenzymatic Assay

Colorectal cancer (CRC) is one of the most common malignancies. Despite the availability of diagnostic tests, an increasing number of new cases is observed. That is why it is very important to search new markers that would show high diagnostic utility. Therefore, we made an attempt to assess the usefulness of eotaxins, as there are few studies that investigate their significance, in patients with CRC. The study included 80 subjects (CRC patients and healthy volunteers). Serum concentrations of all eotaxins were measured using a multiplexing method (Luminex), while CCR3 was measured by immunoenzymatic assay (ELISA). CRP levels were determined by immunoturbidimetry and classical tumor marker levels (CEA and CA 19-9) and were measured using chemiluminescent microparticle immunoassay (CMIA). The highest usefulness among the proteins tested showed CCR3. Its concentrations were significantly higher in the CRC group than in healthy controls. The diagnostic sensitivity, specificity, positive and negative predictive value, and the area under the ROC curve (AUC) of CCR3 were higher than those of CA 19-9. The maximum values for sensitivity, negative predictive value, and AUC were obtained for a combination of CCR3 and CRP. Our findings suggest the potential usefulness of CCR3 in the diagnosis of CRC, especially in combination with CRP or CEA.

scholarly journals Entamoeba histolytica infection in men who have sex with men

2012 ◽  
Vol 12 (9) ◽  
pp. 729-736 ◽  
Author(s):  
Chien-Ching Hung ◽  
Sui-Yuan Chang ◽  
Dar-Der Ji
Keyword(s):  
Entamoeba Histolytica ◽  
Histolytica Infection ◽  
Sex With Men

scholarly journals The Positive Predictive Value of Diagnostic Ultrasound for Occult Herniae

2006 ◽  
Vol 88 (2) ◽  
pp. 165-167 ◽  
Author(s):  
M Bradley ◽  
J Morgan ◽  
B Pentlow ◽  
A Roe
Keyword(s):  
Positive Predictive Value ◽  
Predictive Value ◽  
Diagnostic Tests ◽  
Diagnostic Ultrasound ◽  
Pain Clinic ◽  
Diagnostic Problem ◽  
Clinical Criteria ◽  
Negative Results ◽  
Positive Results

INTRODUCTION The aim of this study is to ascertain the accuracy of diagnostic ultrasound in the assessment of the occult abdominal and groin herniae. The authors have previously demonstrated its efficacy in diagnosing the type of clinical groin herniae but occult herniae provide a further diagnostic problem. PATIENTS AND METHODS A total of 113 consecutive patients were referred prospectively for ultrasound examinations with clinically suspected occult herniae. All positive scans were offered surgery whilst the negative results were offered further imaging or other diagnostic tests depending on the clinical criteria. The end point for negative scans was based on 18-month follow-up or resolution of symptoms. RESULTS Overall, 59 scans showed positive results for herniae and 56 of these had surgery. In the other three patients, two refused an operation, and one had no hernia detected at operation. In the remaining 57 scans, ultrasound offered alternative soft tissue diagnoses in 23 patients and surgical/endoscopic diagnoses accounted for a further 8 patients. CONCLUSIONS Ultrasound offered a diagnosis for the symptomology in 82 patients (70.6%) of which 59 were herniae. The positive predictive value for hernia is 98.3%. Twenty-six patients with no diagnosis or confirmation of herniae on follow-up showed symptom resolution in 22 cases, and four patients were treated by the pain clinic.

scholarly journals Prevalence and risk factors associated with Entamoeba Histolytica infection among children in Sebha, Libya

2017 ◽  
Vol 5 (2) ◽  
pp. 48
Author(s):  
RugaiaMohammed Abdulgader ESalem ◽  
SehamAbobaker Ali Gahgah ◽  
AishaSalih Hamza Ali ◽  
SamahAbdaladhem Rahmma Al Shrief
Keyword(s):  
Risk Factors ◽  
Entamoeba Histolytica ◽  
Factors Associated ◽  
Histolytica Infection

scholarly journals Agreement between commercially available ELISA and in-house Luminex SARS-CoV-2 antibody immunoassays

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rebeca Santano ◽  
Diana Barrios ◽  
Fàtima Crispi ◽  
Francesca Crovetto ◽  
Marta Vidal ◽  
...  
Keyword(s):  
Positive Predictive Value ◽  
Predictive Value ◽  
Diagnostic Tests ◽  
Distress Syndrome ◽  
Clinical Performance ◽  
External Validation ◽  
Severe Respiratory Distress ◽  
Technical Performance ◽  
Severe Respiratory Distress Syndrome

AbstractSerological diagnostic of the severe respiratory distress syndrome coronavirus 2 (SARS-CoV-2) is a valuable tool for the determination of immunity and surveillance of exposure to the virus. In the context of an ongoing pandemic, it is essential to externally validate widely used tests to assure correct diagnostics and epidemiological estimations. We evaluated the performance of the COVID-19 ELISA IgG and the COVID-19 ELISA IgM/A (Vircell, S.L.) against a highly specific and sensitive in-house Luminex immunoassay in a set of samples from pregnant women and cord blood. The agreement between both assays was moderate to high for IgG but low for IgM/A. Considering seropositivity by either IgG and/or IgM/A, the technical performance of the ELISA was highly imbalanced, with 96% sensitivity at the expense of 22% specificity. As for the clinical performance, the negative predictive value reached 87% while the positive predictive value was 51%. Our results stress the need for highly specific and sensitive assays and external validation of diagnostic tests with different sets of samples to avoid the clinical, epidemiological and personal disturbances derived from serological misdiagnosis.

Sign in / Sign up

Export Citation Format

Share Document