Surreal illustration of abdominal ultrasound diagnosing tuberculosis in HIV-positive adult.

Abdominal Ultrasound: A Vital Tool for TB Diagnosis in HIV-Positive Adults

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Beau Callahan in Health & Wellness October 2026 • 4 min read.

"Unlocking the potential of ultrasound in diagnosing abdominal tuberculosis, especially for those with HIV."


Tuberculosis (TB), a persistent global health challenge, often extends beyond the lungs, particularly in individuals with HIV. Diagnosing abdominal TB or disseminated TB with abdominal involvement in HIV-positive adults poses significant difficulties due to atypical presentations and the limitations of traditional diagnostic methods.

In this context, abdominal ultrasound emerges as a promising tool. It is readily accessible, relatively inexpensive, and non-invasive, making it a valuable asset in resource-limited settings where advanced imaging techniques like CT scans are not readily available. But how accurate and reliable is abdominal ultrasound for diagnosing TB in this specific population?

This article delves into a Cochrane review protocol that aims to determine the diagnostic accuracy of abdominal ultrasound, both as a standalone test and in combination with other existing tests, for detecting abdominal TB in HIV-positive adults. We'll explore the potential benefits and limitations of this imaging technique, shedding light on its role in improving TB diagnosis and treatment outcomes.

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TB Burden and Ultrasound’s Role

The CDC publishes tuberculosis data to track progress toward elimination, including U.S. cases among people with HIV test results and TB-HIV coinfection from 2011 through 2024. HIV-positive people have higher rates of extrapulmonary TB, and ultrasound is widely used—including at the point of care—in evaluations for abdominal or disseminated TB. In a study of seriously ill HIV-positive inpatients, three abdominal ultrasound features independently predicted TB with moderate diagnostic performance; ultrasound was more sensitive but less specific than chest radiography in that population.

Diagnostic Challenges in HIV-Associated TB

A prospective study examined abdominal ultrasound in HIV-positive inpatients with cough and World Health Organization danger signs, addressing limitations in earlier studies of ultrasound for HIV-associated TB. More broadly, available TB laboratory diagnostic methods vary substantially in applicability, implementation, and clinical impact across healthcare settings. The supplied sources therefore describe both a focused inpatient study and wider variation in how diagnostic methods can be used in practice.

A Persistent and Re-emerging Disease

Tuberculosis has challenged societies throughout human history, with its social consequences a persistent part of the disease’s story. A global history traces milestones from ancient evidence and consumption through Koch’s identification of the bacillus, sanatoria, BCG vaccination, antibiotics, HIV, and drug resistance. Abdominal TB has re-emerged in Western populations as more HIV infections are recognized, and its varied presentations and resemblance to Crohn’s disease continue to complicate management.

The Potential of Abdominal Ultrasound in TB Diagnosis

Surreal illustration of abdominal ultrasound diagnosing tuberculosis in HIV-positive adult.

Abdominal ultrasound offers a non-invasive way to visualize the abdominal cavity, potentially revealing signs indicative of TB. These signs can include:

  • Lymphadenopathy: Enlarged lymph nodes in the abdomen.
  • Ascites: Accumulation of fluid in the abdominal cavity.
  • Focal lesions: Abnormalities in the liver and spleen.

  • Lymphadenopathy: Enlarged lymph nodes in the abdomen.
  • Ascites: Accumulation of fluid in the abdominal cavity.
  • Focal lesions: Abnormalities in the liver and spleen.
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Evolving Research on TB Diagnosis

A 2024 review reports that untreated HIV increases TB risk and that diagnosis and treatment remain challenging, while access to preventive therapy is limited. A 2023 evidence-based review describes tuberculous peritonitis and gastrointestinal TB as the two major forms of abdominal TB, with esophageal, gastroduodenal, pancreatic, hepatic, gallbladder, and biliary forms occurring less frequently. A 2026 review highlights evolving diagnostic research spanning molecular analysis, non-sputum-based tests, and artificial-intelligence-driven imaging.

Limits of the Evidence Base

The Cochrane review’s selection criteria included cross-sectional, cohort, and diagnostic case-control studies, whether prospective or retrospective, that compared abdominal ultrasound with a reference standard. This describes the study designs eligible for the review, rather than establishing that ultrasound alone can confirm abdominal or disseminated TB. The source excerpt does not provide pooled accuracy estimates or a conclusion about ultrasound’s performance.

Ultrasound Within a Diagnostic Workup

Ultrasound, including point-of-care imaging, is widely used when abdominal or disseminated TB is suspected in people with HIV, who have higher rates of extrapulmonary disease. The FASH protocol has been applied and researched for over a decade in HIV-infected patients with suspected extrapulmonary TB. However, interpreting its target features can be difficult because they may also indicate other opportunistic diseases. One diagnostic guidance source says tissue sampling by laparoscopy or percutaneous biopsy is needed for histopathology and microbiological confirmation, since ascitic-fluid analysis alone has insufficient sensitivity.

While these findings can be suggestive of TB, it's crucial to acknowledge that they are not specific. Other conditions, such as lymphomas or other infections, can manifest similarly. This is where the need for rigorous evaluation and potential combination with other diagnostic tests becomes apparent.

Looking Ahead: Improving TB Diagnosis for Better Outcomes

The Cochrane review protocol underscores the importance of accurate and timely TB diagnosis, particularly in vulnerable populations like HIV-positive adults. By systematically evaluating the diagnostic accuracy of abdominal ultrasound, researchers aim to provide clinicians with evidence-based guidance for its use.

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Toward More Integrated TB-HIV Diagnostics

A 2026 narrative review summarizes current and emerging diagnostic approaches for TB-HIV, emphasizing diagnostic performance, clinical applicability, implementation challenges, and possible integration into future algorithms. A 2025 review describes an ideal test as a point-of-care device that can provide an on-the-spot accurate diagnosis of active TB in HIV-infected and uninfected adults and children, across pulmonary and extrapulmonary disease, while also detecting drug resistance. These are stated research goals and review themes, not evidence that such an ideal tool is already available.

Ultrasound in HIV Clinic Case Finding

Researchers analyzed routine abdominal ultrasonography as a way to support active case finding for abdominal TB in HIV clinics. They undertook the analysis after an observation and a small prospective pilot study that assessed different tests for diagnosing HIV-associated extrapulmonary TB. The source describes the study’s rationale and aim, but its excerpt does not report the results.

The review also highlights the need to consider various factors that can influence test accuracy, such as the expertise of the person performing the ultrasound and the clinical setting. Understanding these sources of heterogeneity is crucial for optimizing the application of abdominal ultrasound in different contexts.

Ultimately, this research strives to improve TB diagnosis, enabling earlier treatment initiation and better outcomes for individuals co-infected with HIV, contributing to global efforts to combat this devastating disease.

What the accuracy estimates mean in practice

The pooled results suggest ultrasound identified some people whose TB was bacteriologically confirmed, but it also missed others. Its ability to distinguish TB from its absence was limited, so these estimates do not establish ultrasound as a stand-alone confirmation test.[1]

The review’s evidence came from studies using different reference standards: laboratory confirmation of TB or a clinical diagnosis without microbiological confirmation. Those standards answer related but not identical questions about whether a scan result matches TB.[1]

What keeps the ultrasound estimates uncertain

  • The authors caution that a negative scan cannot exclude TB, given the test’s limited sensitivity; their conclusion places ultrasound alongside other diagnostic evidence.[1]

A review of abdominal ultrasound accuracy in HIV-positive people

PopulationHIV-positive individuals aged 15 years and older[1]
Sample size11 studies[1]
SettingFive of six studies were conducted in low- or middle-income countries, and one in a high-income country[1]
ComparisonBacteriological confirmation or clinical diagnosis of tuberculosis[1]
Main outcomeDiagnostic accuracy of abdominal ultrasound for detecting abdominal tuberculosis or disseminated tuberculosis with abdominal involvement[1]
Confidence intervalSensitivity: 95% CI 43% to 79%; specificity: 95% CI 42% to 87%[1]
Times cited27[1]

How this review fits the ultrasound evidence

The review addressed a population for whom TB diagnosis is difficult and extrapulmonary disease is more common, examining ultrasound already used in suspected abdominal or disseminated TB.[1]

What future evaluations would need to clarify

  • How much do clinical setting and the ultrasound operator’s training account for differences in accuracy across studies?[1]
  • Would estimates change if studies used bacteriological confirmation consistently rather than mixing it with clinical diagnoses?[1]

Sources

  1. Abdominal ultrasound for diagnosing abdominal tuberculosis or disseminated tuberculosis with abdominal involvement in HIV-positive adults (Wiley, 2017)

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

This article is based on research published under:

DOI-LINK: 10.1002/14651858.cd012777, Alternate LINK

Title: Abdominal Ultrasound For Diagnosing Abdominal Tuberculosis Or Disseminated Tuberculosis With Abdominal Involvement In Hiv-Positive Adults

Subject: Pharmacology (medical)

Journal: Cochrane Database of Systematic Reviews

Publisher: Wiley

Authors: Daniel J Van Hoving, Graeme Meintjes, Yemisi Takwoingi, Rulan Griesel, Gary Maartens, Eleanor A Ochodo

Published: 2017-08-31

Everything You Need To Know

1

What is abdominal ultrasound, and how does it help diagnose TB?

Abdominal ultrasound is a non-invasive imaging technique that allows visualization of the abdominal cavity. It's particularly useful in diagnosing abdominal TB in HIV-positive adults. The examination can reveal signs such as Lymphadenopathy, Ascites, and Focal lesions, which may indicate the presence of TB. Its importance lies in its accessibility, affordability, and non-invasive nature, making it a viable option in resource-limited settings where advanced imaging is unavailable.

2

Why is abdominal ultrasound important for diagnosing TB in HIV-positive adults?

The significance of abdominal ultrasound for diagnosing Tuberculosis (TB) in HIV-positive adults lies in its potential to improve early detection and treatment outcomes. Traditional diagnostic methods often face limitations, and abdominal TB can present atypically in this population. Abdominal ultrasound offers a readily available and relatively inexpensive alternative, providing clinicians with a tool to identify possible signs of TB, such as Lymphadenopathy, Ascites, and Focal lesions. This early detection can lead to timely interventions, potentially improving patient outcomes.

3

What specific signs of Tuberculosis can abdominal ultrasound reveal?

Abdominal ultrasound can reveal several indicators of Tuberculosis (TB) in the abdomen. These include Lymphadenopathy, which is the enlargement of lymph nodes; Ascites, which is the accumulation of fluid in the abdominal cavity; and Focal lesions, which are abnormalities observed in organs like the liver and spleen. These findings can be suggestive of TB but are not definitive on their own. Further tests may be required to confirm a diagnosis due to the lack of specificity.

4

What are the limitations of using abdominal ultrasound for diagnosing TB?

The limitations of abdominal ultrasound in diagnosing abdominal Tuberculosis (TB) include its lack of specificity. While findings like Lymphadenopathy, Ascites, and Focal lesions can suggest TB, they can also be caused by other conditions. This means that a positive ultrasound result alone is not enough to confirm a TB diagnosis, and additional tests may be necessary to differentiate TB from other possible causes of these findings. This emphasizes the importance of using abdominal ultrasound in conjunction with other diagnostic tools.

5

What is the purpose of the Cochrane review protocol regarding abdominal ultrasound?

The Cochrane review protocol aims to evaluate the diagnostic accuracy of abdominal ultrasound for Tuberculosis (TB) in HIV-positive adults. This evaluation will assess the effectiveness of abdominal ultrasound both as a standalone test and when combined with other diagnostic methods. By providing evidence-based guidance, the review seeks to assist clinicians in making informed decisions about using abdominal ultrasound, ultimately improving TB diagnosis and treatment outcomes in this vulnerable population. The results of this review will inform clinical practice and improve patient care.

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