Aetna considers total body (i.e., full-body or whole-body) CT screening or full-body ultrafast (electron-beam) CT screening experimental and investigational because it has not been shown to be effective as a screening test.Background
A number of for-profit medical clinics have been heavily advertising total-body ultrafast computed tomography (CT) scanning as a screening test. However, no medical professional organization has recommended the use of ultrafast whole-body CT as a screening test. In addition, there are no published clinical trials examining the safety and effectiveness of whole-body ultrafast CT scanning.
The American College of Radiology Board of Chancellors issued the following position statement on full-body CT screening:
“The American College of Radiology (ACR), at this time, does not believe there is sufficient scientific evidence to justify recommending total body computed tomographic (CT) screening for patients with no symptoms or a family history suggesting disease. To date there is no evidence that total body CT screening is cost effective or is effective in prolonging life. In addition, the ACR is concerned that this procedure will lead to the discovery of numerous findings that will not ultimately affect patients’ health, but will result in increased patient anxiety, unnecessary follow-up examinations and treatments and wasted expense. ACR will continue to monitor scientific studies concerning this procedure. The benefits and risks of this method of screening have not been assessed in adequate clinical trials. In addition, these screening tests may unnecessarily expose patients to harmful levels of radiation.”
A technology assessment conducted by the Institute for Clinical Systems Improvement (2003) reached the following conclusions:
Routine full-body CT screening may increase risk of cancer mortality. Brenner and Elliston (2004) estimated that the lifetime risk of cancer death increases after just 1 CT scan and grows with each successive scan. For example, a single full-body CT scan in a 45-year old results in a 1 in 1,250, or 0.08 %, increased chance of dying from cancer. This risk jumps to 1 in 50, or 1.9 %, for an adult who begins having scans at 45 and has 1 each year for 30 years. This study also found that radiation-induced lung cancer was the main form of cancer associated with CT scans.
Furtado et al (2005) retrospectively determined the frequency and spectrum of findings and recommendations reported with whole-body CT screening at a community screening center. The radiological reports of 1,192 consecutive patients who underwent whole-body CT screening of the chest, abdomen, and pelvis at an outpatient imaging center from January to June 2000 were reviewed. Scans were obtained with electron-beam CT without oral or intravenous contrast material. Reported imaging findings and recommendations were retrospectively tabulated and assigned scores. Descriptive statistics were used (means, standard deviations, and percentages); comparisons between subgroups were performed with univariate analysis of variance and chi(2) or Fisher exact tests. Screening was performed in 1,192 patients (mean age of 54 years). Sixty-five % (774/1,192) were men and 35 % (418/1,192) were women; 903 (76 %) of 1,192 patients were self-referred, and 1,030 (86 %) of 1,192 subjects had at least 1 abnormal finding described in the whole-body CT screening report. There were a total of 3,361 findings, with a mean of 2.8 per patient. Findings were described most frequently in the spine (1,065/3,361; 32 %), abdominal blood vessels (561/3,361; 17 %), lungs (461/3,361; 14 %), kidneys (353/3,361; 11 %), and liver (183/3,361); 5 %). A total of 445 (37 %) patients received at least 1 recommendation for further evaluation. The most common recommendations were for additional imaging of the lungs or the kidneys. The authors concluded that with whole-body CT screening, findings were detected in a large number of subjects, and most findings were benign by description and required no further evaluation; 37 % of patients had findings that elicited recommendations for additional evaluation, but further research is needed to determine the clinical importance of these findings and the effect on patient care.
Sierink et al (2012) evaluated the value of immediate total-body CT during the primary survey of injured patients compared with conventional radiographic imaging supplemented with selective CT. A systematic search of the literature was performed in MEDLINE, Embase, Web of Science and Cochrane Library databases. Reports were eligible if they contained original data comparing immediate total-body CT with conventional imaging supplemented with selective CT in injured patients. The main outcomes of interest were overall mortality and time in the emergency room (ER). A total of 4 studies were included describing a total of 5,470 patients; 1 study provided 4,621 patients (84.5 %). All 4 studies were non-randomized cohort studies with retrospective data collection. Mortality was reported in 3 studies. Absolute mortality rates differed substantially between studies, but within studies mortality rates were comparable between immediate total-body CT and conventional imaging strategies (pooled odds ratio 0.91, 95 % confidence interval: 0.79 to 1.05). Time in the ER was described in 3 studies, and in 2 was significantly shorter in patients who underwent immediate total-body CT: 70 versus 104 mins (p = 0.025) and 47 versus 82 mins (p < 0.001) respectively. The authors concluded that this review showed differences in time in the ER in favor of immediate total-body CT during the primary trauma survey compared with conventional radiographic imaging supplemented with selective CT. There were no differences in mortality. They stated that the substantial reduction in time in the ER is a promising feature of immediate total-body CT; but well-designed and larger randomized studies are needed to see how this will translate into clinical outcomes.
Gentile et al (2013) stated that total body computed tomography (TB-CT) scan is not mandatory in the diagnostic/staging algorithm of chronic lymphocytic leukemia (CLL). These researchers determined the value and prognostic significance of TB-CT scan in early stage CLL patients. Baseline TB-CT scan was performed in 240 Binet stage A CLL patients (179 Rai low- and 61 Rai intermediate-risk) included in a prospective multi-center observational study (clinicaltrial.gov ID:NCT00917549). The cohort included 69 clinical monoclonal B lymphocytosis (cMBLs). Patients were re-staged considering only radiological data. Following TB-CT scans, 20 % of cases re-classified as radiologic Binet (r-Binet) stage B. r-Binet B patients showed a higher incidence of unfavorable cytogenetic abnormalities (p = 0.027), as well as a shorter PFS (p = 0.001). At multi-variate analysis, r-Binet stage [HR = 2.48; p = 0.004] and IGHV mutational status [HR = 3.01; p = 0.002] retained an independent predictive value for PFS. Among 179 Rai low-risk cases, 100 were redefined as r-Rai intermediate-risk based upon TB-CT scan data, showing a higher rate of cases with higher ZAP-70 (p = 0.033) and CD38 expression (p = 0.029) and β2-microglobulin levels (p < 0.0001), as well as a shorter PFS than those with r-Rai low-risk (p = 0.008). r-Rai stage [HR = 2.78; p = 0.046] and IGHV mutational status [HR = 4.25; p = 0.009] retained a significant predictive value for PFS at multi-variate analysis. Forty-two percent of cMBL patients were reclassified as r-small lymphocytic lymphomas (r-SLLs) by TB-CT scan. The authors concluded that TB-CT scan appeared to provide relevant information in early stage CLL related to the potential and the timing of patients to progress towards the more advanced disease stages.
Healy et al (2014) stated that full-body CT scanning is increasingly being used in the initial evaluation of severely injured patients. These researchers analyzed the literature to determine the benefits of full-body scanning in terms of mortality and length of time spent in the emergency department (ED). A systematic search of the PubMed and Cochrane Library databases was performed. Eligible studies compared trauma patients managed with selective CT scanning with patients who underwent immediate full-body scanning. Using random effects modelling, the pooled odds ratio (OR) was used to calculate the effect of routine full-body CT on mortality while the pooled weighted mean difference (WMD) was used to analyze the difference in ED time. A total of 5 studies (8,180 patients) provided mortality data while 4 studies (6,073 patients) provided data on ED time. All were non-randomized cohort studies and were prone to several sources of bias. There was no mortality difference between groups (pooled OR = 0.68; 95 % confidence interval [CI]: 0.43 to 1.09, p = 0.11). There was a significant reduction in the time spent in the ED when patients underwent full-body CT (pooled effect size of WMD =-32.39 mins; 95 % CI: -51.78 to -13.00; p = 0.001). The authors concluded that they eagerly await the results of randomized controlled trials (RCTs); firm clinical outcome data are expected to emerge in the near future, although data on cost and radiation exposure are needed before definitive conclusions can be made.
Surendran and colleagues (2014) reviewed the literature for all outcomes measured in comparing whole-body computed tomography (WBCT) with selective imaging in trauma patients and evaluated the comprehensiveness of relevant dimensions for this comparison. These investigators performed a systematic review of studies comparing WBCT and selective imaging approaches during the initial assessment of multi-trauma patients. Peer-reviewed studies including cohort studies, RCTs, meta-analyses, and systematic reviews were identified through large database searches and filtered through methodological inclusion criteria. Data on study characteristics, hypotheses and conclusions made, outcomes assessed, and references to potential benefits and harms were extracted. A total of 8 retrospective cohort studies and 2 systematic reviews were identified; 6 primary studies evaluated mortality as an outcome; and 4 studies found a significant difference in results favoring WBCT imaging over selective imaging. All 5 articles assessing various time intervals in hospital following imaging after injury found significantly reduced times with WBCT. Radiation exposure was found to be increased after WBCT imaging compared with selective imaging in the only study in which it was evaluated. The 2 systematic reviews analyzed the same 3 articles with regard to mortality but concluded differently about overall benefits. The authors concluded that WBCT imaging appeared to be associated with reduced times to events in hospital following traumatic injury and appeared to be associated with decreased mortality. Whether this is a true effect mediated through an as yet unsubstantiated change in management or the result of hospital- or individual-level confounders is unclear. Moreover, they stated that when evaluating these outcomes, it seemed that the authors of both primary studies and systematic reviews have often been selective in their choice of short-term outcomes, painting an incomplete picture of the issue.
An UpToDate review on “Full body CT scan for screening” (Jackson et al, 2015) states:
|CPT Codes / HCPCS Codes / ICD-10 Codes|
|Information in the [brackets] below has been added for clarification purposes.  Codes requiring a 7th character are represented by "+":|
|ICD-10 codes will become effective as of October 1, 2015:|
|HCPCS codes not covered for indications listed in the CPB::|
|S8092||Electron beam computed tomography (also known as ultrafast CT, cine CT)|