Diagnostic Tests in Occupational Therapy: A Model for Evaluation

1987 ◽  
Vol 7 (2) ◽  
pp. 111-122 ◽  
Author(s):  
Mary C. Law ◽  
Helene J. Polatajko
Keyword(s):  
Occupational Therapy ◽  
Predictive Value ◽  
Gold Standard ◽  
Diagnostic Tests ◽  
Southern California ◽  
Sensitivity Specificity

This article describes a model for the evaluation of diagnostic tests used in occupational therapy. In this model, new diagnostic tests are compared to valid tests (“gold standard”), and their sensitivity, specificity, predictive value, and agreement are calculated. The use of this method is illustrated with data from the Southern California Postrotary Nystagmus Test and the Stille-Werner Rotation Chair.

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.

The utility of rapid Group A streptococcus molecular testing compared with throat culture for the diagnosis of Group A streptococcal pharyngitis in a high-incidence rheumatic fever population.

2021 ◽  
Author(s):  
Amanda Taylor ◽  
Susan Morpeth ◽  
Rachel Webb ◽  
Susan Taylor
Keyword(s):  
New Zealand ◽  
Rheumatic Fever ◽  
Predictive Value ◽  
Gold Standard ◽  
Molecular Test ◽  
Throat Culture ◽  
High Incidence ◽  
Group A ◽  
Sensitivity Specificity ◽  
Culture Negative

Background: Group A Streptococcus (GAS) causes significant morbidity and mortality in New Zealand and is responsible for invasive disease and immune sequelae including acute Rheumatic Fever (ARF). Early treatment of GAS pharyngitis reduces the risk of ARF. In settings with a high-burden of GAS disease, a rapid GAS pharyngitis diagnostic test with a strong negative predictive value is needed to enable prompt and accurate treatment. Methods: This prospective study compares the Xpert® Xpress Strep A molecular test (Cepheid) to throat culture and a second molecular method, the BioGX Group A Streptococcus -OSR for BD MAX TM for the diagnosis of GAS pharyngitis. Throat swabs were collected from the emergency department and wards of Middlemore Hospital, New Zealand. The BioGX Group A Streptococcus - OSR for BD MAX TM , contributes to the composite gold-standard: throat culture or both molecular methods positive. Basic demographic, clinical and laboratory data was collected. Results: 205/214 swabs were suitable for analysis. 28/205 (13.7%) were GAS culture positive, 45/205 (22%) Xpert® Xpress Strep A positive and 38/205 (18.5%) BioGX positive. Compared to culture, the sensitivity, specificity, positive and negative predictive values of the Xpert® Xpress Strep A molecular test were 100%, 90.4%, 62.2% and 100%, respectively. Compared to the composite gold-standard, the sensitivity, specificity, PPV and NPV and were 100%, 95.8%, 84.4% and 100% respectively. 17 samples were Xpert® Xpress positive but culture-negative; 6 of these 17 swabs represent true positives with evidence of recent GAS infection. Ten samples were culture negative but both Xpert® Xpress and BioGX positive. Conclusion: The Xpert® Xpress Strep A molecular test is highly sensitive with a strong negative predictive value and rapid turnaround time. It can be safely introduced as a first line test for throat swabs in a high-incidence ARF population.

scholarly journals Evaluation of two new rapid diagnostic tests (RDTs) for the diagnosis of malaria

2013 ◽  
Vol 5 (2) ◽  
pp. 11-15 ◽  
Author(s):  
Fahmida Jahan ◽  
Rubayet Elahi ◽  
Md. Khaja Mohiuddin ◽  
Md. Gulam Musawwir Khan ◽  
Mohammad Shafiul Alam ◽  
...  
Keyword(s):  
Predictive Value ◽  
Gold Standard ◽  
Diagnostic Tests ◽  
Rapid Diagnostic Tests ◽  
Accurate Diagnosis ◽  
The Other ◽  
Antibody Detection ◽  
Resource Limited Settings ◽  
Malaria Rdts ◽  
Resource Limited

Rapid diagnostic tests (RDTs) address the need for accurate diagnosis of malaria, particularly in resource limited settings. In this study, two malaria RDTs were compared with gold standard microscopy: On Site Pf/Pv test detecting Plasmodium falciparum-specific histidine rich protein-2 (Pf HR P2) and P. vivax-specific parasitic lactate dehydrogenase (pLDH) antigens; and SD Bioline anti-Pf/Pv test detecting anti-HR P2 and anti-pL DH antibodies for the diagnosis of P. falciparum and P. vivax infections, respectively. For OnSite test, the overall sensitivity was found 96.2% , specificity 98.2% , positive predictive value (PPV ) 98.2% , negative predictive value (NPV ) 96.4% and agreement with microscopy was found to be 0.94. On the other hand SD Bioline test, the overall sensitivity was 75.4%, specificity 83.7%, PPV 84.3% , NPV 74.5% and agreement with microscopy was 0.59. These data revealed that the R DT based on antigen detection (Onsite test) was more reliable than that based on the antibody detection (SD Bioline test).DOI: http://dx.doi.org/10.3329/bjmm.v5i2.16931 Bangladesh J Med Microbiol 2011; 05 (02): 11-15

scholarly journals Effectivity of microscopic test as a simple diagnostic method to detect fat malabsorption in children

2019 ◽  
Vol 28 (4) ◽  
pp. 338-44
Author(s):  
Ariani Dewi Widodo ◽  
Muzal Kadim ◽  
Ina Susianti Timan ◽  
Nuraini Irma Susanti ◽  
Fatima Safira Alatas ◽  
...  
Keyword(s):  
Predictive Value ◽  
Gold Standard ◽  
Diagnostic Study ◽  
Normal Children ◽  
Cross Sectional ◽  
Primary Endpoints ◽  
Sudan Iii ◽  
Fat Malabsorption ◽  
Moderate Sensitivity ◽  
Sensitivity Specificity

BACKGROUND Lipid malabsorption causes many health problems, for example stunting, a major worldwide issue. There has not been any assessment on the effectivity of lipid microscopic test in diagnosing lipid malabsorption. This research was aimed to study the effectivity of lipid microscopic test in detecting lipid malabsorption in children. METHODS This was a cross-sectional diagnostic study that evaluated the effectivity of lipid microscopic test using Sudan III against steatocrit test as the gold standard in diagnosing lipid malabsorption. The study was done in 68 children aged 6–60 months in Cipto Mangunkusumo Hospital, Jakarta. Results of lipid microscopic test were compared with that of steatocrit test among children with lipid malabsorption and normal children. The primary endpoints of this study are the sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV). RESULTS A total of 68 children consisting of 41 boys and 27 girls were included, with a median age of 14.3 months. The most frequently found stool consistency was mushy (50%). The most common result of microscopic test, found in 42% of subjects, was positive 1. Sensitivity, specificity, PPV, and NPV of lipid microscopic test were 49.15%, 66.67%, 90.63%, and 16.67%, respectively. CONCLUSIONS Lipid microscopic test has a moderate sensitivity in diagnosing fat malabsorption and needs to be complemented with other methods such as steatocrit.

Evaluating Diagnostic Tests

1993 ◽  
Vol 7 (2) ◽  
pp. 66-69 ◽  
Author(s):  
C.W. Douglass
Keyword(s):  
Predictive Value ◽  
Diagnostic Tests ◽  
Clinical Decision Making ◽  
New Technologies ◽  
Clinical Decision ◽  
Future Research ◽  
Scientific Support ◽  
Body Of Knowledge ◽  
Efficacy Parameters ◽  
Sensitivity Specificity

The presentations at this conference will discuss new technologies and rapid scientific developments that have resulted in new diagnostic tests for periodontal disease, musculoskeletal imaging, temporomandibular joint dysfunctions, and incipient coronal and root dental caries. However, for many of these claims, there has been insufficient scientific support regarding the sensitivity and specificity of the tests, or their ability to predict the percent of cases in which the disease or condition progresses to the next state of development. Research is needed that will yield the basic diagnostic parameters of new diagnostic tests, i.e., their accuracy, precision, sensitivity, specificity, positive predictive value, and negative predictive value. The purpose and methods for calculating each of these measures are described in this paper. Five questions are then presented that will need to be addressed in future research regarding new diagnostic tests: (1) Does the scientific theory of the test fit with our current body of knowledge? (2) Have the efficacy parameters of the test been reliably determined? (3) How does the test affect clinical decision-making? (4) Does using the test improve the patient's health? and (5) Is the added expense of the test justified by increased effectiveness or by avoiding other health expenditures?

scholarly journals Diagnostic performance of 3D-multi-Echo-data-image-combination (MEDIC) for evaluating SLAP lesions of the shoulder

2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Felix Wuennemann ◽  
Laurent Kintzelé ◽  
Felix Zeifang ◽  
Michael W. Maier ◽  
Iris Burkholder ◽  
...  
Keyword(s):  
Shoulder Pain ◽  
Predictive Value ◽  
Gold Standard ◽  
Proton Density ◽  
Diagnostic Challenge ◽  
Cohen’S Kappa ◽  
Slap Lesions ◽  
Cohen's Kappa ◽  
Sensitivity Specificity ◽  
Interreader Agreement

Abstract Background Superior labral anterior to posterior (SLAP) lesions remain a clinical and diagnostic challenge in routine (non-arthrographic) MR examinations of the shoulder. This study prospectively evaluated the ability of 3D-Multi-Echo-Data-Image-Combination (MEDIC) compared to that of routine high resolution 2D-proton-density weighted fat-saturated (PD fs) sequence using 3 T-MRI to detect SLAP lesions using arthroscopy as gold standard. Methods Seventeen consecutive patients (mean age, 51.6 ± 14.8 years, 11 males) with shoulder pain underwent 3 T MRI including 3D-MEDIC and 2D-PD fs followed by arthroscopy. The presence or absence of SLAP lesions was evaluated using both sequences by two independent raters with 4 and 14 years of experience in musculoskeletal MRI, respectively. During arthroscopy, SLAP lesions were classified according to Snyder’s criteria by two certified orthopedic shoulder surgeons. Sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of 3D-MEDIC and 2D-PD fs for detection of SLAP lesions were calculated with reference to arthroscopy as a gold standard. Interreader agreement and sequence correlation were analyzed using Cohen’s kappa coefficient. Figure 1 demonstrates the excellent visibility of a proven SLAP lesion using the 3D-MEDIC and Fig. 2 demonstrates a false-positive case. Results Arthroscopy revealed SLAP lesions in 11/17 patients. Using 3D-MEDIC, SLAP lesions were diagnosed in 14/17 patients by reader 1 and in 13/17 patients by reader 2. Using 2D-PD fs, SLAP lesions were diagnosed in 11/17 patients by reader 1 and 12/17 patients for reader 2. Sensitivity, specificity, PPV, and NPV of 3D-MEDIC were 100.0, 50.0, 78.6, and 100.0% for reader 1; and 100.0, 66.7, 84.6, and 100% for reader 2, respectively. Sensitivity, specificity, PPV, and NPV of 2D-PD fs were 90.9, 83.3, 90.9, and 83.3% for reader 1 and 100.0, 83.3, 91.7, and 100.0% for reader 2. The combination of 2D-PD fs and 3D-MEDIC increased specificity from 50.0 to 83.3% for reader 1 and from 66.7 to 100.0% for reader 2. Interreader agreement was almost perfect with a Cohen’s kappa of 0.82 for 3D-MEDIC and 0.87 for PD fs. Conclusions With its high sensitivity and NPV, 3D-MEDIC is a valuable tool for the evaluation of SLAP lesions. As the combination with routine 2D-PD fs further increases specificity, we recommend incorporation of 3D-MEDIC as an additional sequence in conventional shoulder protocols in patients with non-specific shoulder pain.

Diagnostic evaluation of immune checkpoint inhibitor (CPI) colitis: The role of CT scan.

2020 ◽  
Vol 38 (4_suppl) ◽  
pp. 821-821
Author(s):  
Sienna Durbin ◽  
Meghan Mooradian ◽  
Leyre Zubiri ◽  
Ian Matthew Allen ◽  
Florian Fintelmann ◽  
...  
Keyword(s):  
Ct Scan ◽  
Predictive Value ◽  
Gold Standard ◽  
Invasive Procedure ◽  
Primary Objective ◽  
Lower Endoscopy ◽  
Grade 3 ◽  
Sensitivity Specificity ◽  
Tumor Types

821 Background: CPI therapy has expanded rapidly in recent years and represents a major advancement in the treatment of many cancers, including hepatocellular carcinoma, gastric cancer, and colon cancer. However, these therapies are associated with significant toxicities. CPI colitis is one of the most common toxicities and can be fatal, especially when not diagnosed and treated promptly. The current gold standard for diagnosis is endoscopy with biopsy, an invasive procedure that is resource- and time-intensive. CT has emerged as a possible alternative. The primary objective of this study is to identify the diagnostic performance of CT in the evaluation of CPI colitis. Methods: With IRB approval, we conducted a retrospective cohort study of patients who received CPI therapy between 2009-2019 across a single healthcare system. Patients were included if they underwent both abdominal CT and upper/lower endoscopy with biopsy within 72 hours of each other. We reviewed the electronic medical record to identify possible cases of colitis based on either CT or pathology. All cases were labeled as either true positive or false positive based on pathology. We examined clinical characteristics, including CTCAE grade and treatment received. We calculated the sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of CT for diagnosing CPI colitis when compared to the gold standard of tissue diagnosis. Results: Of the 4,474 patients screened, 141 met inclusion criteria. Average age was 63 years (23 – 91); 43% were male. Most common tumor types were melanoma (36%) and NSCLC (20%). Seventy-four percent of patients were treated with anti-PD-1/PD-L1 monotherapy. Forty percent had signs of colitis on CT scan and 59% had biopsy-proven CPI colitis. Sensitivity and specificity of CT were 51% and 74%, respectively. PPV of CT was 74% and NPV was 51%. Of those with confirmed CPI colitis, 78% had symptoms that were classified as grade 3 or above. Seventy-three percent received IV steroids and 38% received infliximab. Conclusions: CT demonstrates moderate specificity and PPV and remains an important diagnostic test but does not replace endoscopy/biopsy in the evaluation of CPI colitis.

scholarly journals Comparison of International Federation of cervical pathology and colposcopy nomenclature (2011) and Swede score for assessment of cervical lesions

2021 ◽  
Author(s):  
Bindiya Gupta ◽  
Rashmi Shreya ◽  
Shalini Rajaram ◽  
Anshuja Singla ◽  
Sandhya Jain ◽  
...  
Keyword(s):  
Positive Predictive Value ◽  
Prospective Study ◽  
Negative Predictive Value ◽  
Predictive Value ◽  
Gold Standard ◽  
International Federation ◽  
Objective Method ◽  
Cervical Lesions ◽  
Sensitivity Specificity ◽  
Strength Of Association

Abstract Purpose: Standardization of colposcopic evaluation is important as it is observer dependent.The aim of the study was to compare the strength of association of colposcopic findings by International Federation of Colposcopy and Cervical Pathology (IFCPC) nomenclature and Swede score. Methods: In the prospective study, 150 women aged 30 to 60 years with abnormal screening results underwent colposcopy, the findings were evaluated using both IFCPC and Swede score and biopsy was taken from abnormal areas. Performances by both the methods were calculated taking biopsy as gold standard. Results: Nineteen ≥ CIN2 lesions were detected. The sensitivity, specificity, positive predictive value and negative predictive value for detecting ≥ CIN2 lesion by IFCPC scoring was 63.6%, 96.0%, 78.7%, 91.9%. Using Swede score, sensitivity, specificity, positive predictive value and negative predictive value at cut off of 8 were 42.4, 95%, 96.6% and 81.8% while at cut-off of 5, these were 96%, 88.3%,76.7% and 93.6%. The agreement between IFCPC major lesion and Swede score ≥ 8 for ≥ CIN2 was 0.626 (p<0.01). Conclusion: Swede score is an easier and more objective method for colposcopic evaluation and a score >8 can be applied to the screen and treat programme.

scholarly journals Assessment of nutritional status of children aged 34-92 months using various nutritional status indices and validity of age independent indices

2019 ◽  
Vol 6 (6) ◽  
pp. 2593
Author(s):  
Nayantara R. Gandra ◽  
Kalavathy Jasmine Masillamoni
Keyword(s):  
Nutritional Status ◽  
Predictive Value ◽  
Gold Standard ◽  
High Sensitivity ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Nutritional Status Of Children ◽  
Sensitivity Specificity ◽  
Age Independent ◽  
Weight For Age

Background: Even though there are many programs run by Government to tackle the problem of malnutrition in India, problem of malnutrition is still there. Malnutrition leads to infections and even can lead to death of child in severe cases. The mortality rate is very high compared to other countries. The objective of the study to study validity of age independent various nutritional status indices in comparison to gold standard of weight for ageMethods: Present study was institution based cross sectional study carried out at SDA high school, from January 2019 to July 2019 among 58 school children aged 34-92 months of age. Anthropometric measurements like weight, height, head circumference, chest circumference, mid arm circumference were recorded as per the standard guidelines. Weight for height, weight of age, Kanawati Index, Jeliffe’s ratio, Rao index, and Dugdales index was calculated. Gold standard used was weight for age. Sensitivity, specificity, positive predictive value and negative predictive value were calculated for these indices.Results: Majority of the children belonged to 48-60 months and 61-72 months i.e. 29.3% each. Males were more than females. Prevalence of malnutrition was 60.3%, 48.3%, 51.7%, 91.4%, and 56.8% based on weight for age, Kanawati index, Rao index, Jeliffe’s ratio and Dugdale’s index respectively. Dugdale’s index was found to have high sensitivity (85.7%) and specificity (86.9%) compared to all other indices.Conclusions: Among age independent indices of nutritional status available, Dugdales index can be used as it has been found that it has remarkably higher sensitivity and specificity compared to other age independent indices of nutritional status.

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