Faecal Occult Blood (FOB)
The Faecal Occult Blood (FOB) test is a non-invasive diagnostic test used to detect hidden (occult) blood in the stool.
Unlike visible bleeding, occult blood is not detectable by the naked eye and may only be identified through laboratory analysis.
The presence of blood in the stool can be an important early indicator of gastrointestinal conditions, including colorectal cancer,
polyps, inflammatory bowel disease, and other digestive tract disorders.
FOB testing is widely used as a screening tool, particularly in individuals who may not yet have symptoms. Detecting blood early
allows clinicians to investigate potential underlying causes before they progress. The test is simple, convenient, and plays a key
role in preventive healthcare, especially for individuals at increased risk of colorectal disease.
There are different methods of FOB testing, including guaiac-based tests and immunochemical tests (FIT). Modern testing methods are
more specific for human haemoglobin and reduce the likelihood of false positives caused by dietary factors. Regardless of the method,
the aim remains the same: to identify microscopic bleeding that may require further clinical evaluation.
- Price: £35
- Code: FOB
- TAT: 3 Working Days
- Sample Type: Stool
Clinical Significance
The clinical importance of the FOB test lies in its ability to detect early signs of gastrointestinal bleeding.
One of the most significant applications of this test is in the early detection of colorectal cancer. In many cases, small tumours
or polyps may bleed intermittently, releasing tiny amounts of blood into the stool long before other symptoms appear.
Early detection through FOB testing can significantly improve outcomes, as colorectal cancer is far more treatable when diagnosed
at an early stage. The test is therefore commonly used in screening programmes and routine health assessments for individuals over
a certain age or those with increased risk factors.
In addition to cancer screening, a positive FOB result may indicate other conditions such as haemorrhoids, diverticulosis,
ulcers, or inflammatory bowel diseases such as Crohn’s disease or ulcerative colitis. While these conditions vary in severity,
identifying occult blood provides an important starting point for further investigation.
It is important to understand that a positive FOB result does not confirm a specific diagnosis. Instead, it highlights the need for
additional tests, such as colonoscopy or imaging studies, to determine the exact source and cause of bleeding.
Who Should Consider This Test?
The FOB test is commonly recommended for individuals as part of routine screening for colorectal cancer,
particularly those aged 50 and above. However, younger individuals may also benefit from testing if they have risk factors such as
a family history of colorectal cancer, personal history of polyps, or chronic gastrointestinal symptoms.
Patients experiencing symptoms such as unexplained fatigue, iron deficiency anaemia, changes in bowel habits, abdominal discomfort,
or unexplained weight loss may also be advised to undergo FOB testing. In many cases, these symptoms may be subtle or attributed to
other causes, making laboratory testing essential for accurate assessment.
The test may also be used in ongoing monitoring for individuals with known gastrointestinal conditions or those who have previously
had abnormal findings. Regular screening can help detect changes early and guide timely medical intervention.
Sample Collection
The FOB test requires a stool sample, which can typically be collected at home using a provided collection kit.
Clear instructions are given to ensure proper sample collection and handling. It is important to avoid contamination of the sample
and to follow any dietary or medication guidance provided by the healthcare provider.
Once collected, the sample is returned to the laboratory for analysis. Modern testing methods are designed to be highly sensitive
and specific, ensuring reliable detection of even small amounts of blood.
The process is simple, non-invasive, and does not require any complex preparation in most cases, making it an accessible and
convenient screening option for many patients.
Understanding Your Results
Results from the FOB test are typically reported as positive or negative. A negative result indicates that no
occult blood was detected in the sample at the time of testing. While reassuring, it does not completely rule out the presence of
disease, particularly if bleeding is intermittent. In some cases, repeat testing may be recommended.
A positive result indicates that blood has been detected in the stool. This does not necessarily mean that a serious condition is
present, but it does require further investigation to identify the source of bleeding. Healthcare providers may recommend
additional tests such as colonoscopy, endoscopy, or imaging studies depending on the clinical context.
Because many factors can influence results, including medications or minor gastrointestinal irritation, interpretation should
always be performed by a qualified healthcare professional. The FOB test serves as an important first step in identifying
potential issues and guiding further diagnostic evaluation.
FAQs
When will I receive my results?
Results are usually available within the stated turnaround time.
Should I discuss my results with a doctor?
Yes, results should always be reviewed with a qualified healthcare professional.
Why Choose Marylebone Diagnostic Centre?
Marylebone Diagnostic Centre offers reliable and discreet gastrointestinal screening services using accredited
laboratories and modern diagnostic techniques. Our FOB testing is designed to provide accurate and timely results, supporting
early detection and proactive healthcare management.
We provide a professional clinical environment with clear guidance on sample collection and testing procedures. With a turnaround
time of approximately 3 days, patients receive prompt results that can help guide further medical decisions.
Our commitment to quality, accuracy, and patient care ensures that you receive dependable diagnostic information to support your
health and wellbeing.
Book Now
Book the Faecal Occult Blood (FOB) test today to support early detection of gastrointestinal conditions and
take a proactive approach to your digestive health.
