NutriPATH offer an extensive range of gastrointestinal test profiles to assist and provide a practitioner with the flexibility in deciding the most appropriate test analyses for the patient.

The CDSA test can assist physicians to develop earlier, more effective preventive interventions, improve the timing and precision of treatments and reduce the risk of clinical relapse in certain groups of patients. It will also allow physicians to better evaluate and document the medical necessity for more invasive procedures such as colonoscopy.

The CDSA Level 2 comprises all components and markers of the CDSA Level 1 profile as well as the addition of important biochemical markers including, digestive absorption and metabolic markers. This test will also provide other bacteria detected such as candida or streptococcus.

Furthermore, the CDSA level 2 profile will provide a list of prescriptive and natural agent sensitivities parasitic or bacterial organisms if they are detected for optimal choice of treatment. This test provides an excellent assessment of digestive function and is the appropriate choice for patients presenting with suboptimal gut function or is ideal for patients with sudden changes in bowel pattern, especially for those who have been traveling abroad or camping. It is recommended to add a DNA Multiplex PCR (2002) test to any CDSA level if you suspect parasites.

Or another example:

PCR testing is a sensitive method for the detection of ten major enteric pathogens. The faecal PCR test detects parasite and bacterial DNA, making it a more accurate technique than a standard Micro, Culture and Sensitivity (MC&S) that would normally be requested by conventional laboratories.

The faecal PCR profile is capable of rapid, specific and sensitive detection of the bacterial and parasitic pathogens most commonly responsible for causing infectious gastroenteritis that may otherwise go undetected by traditional microbiological techniques. PCR is based on molecular screening of parasites rather than detection of parasites based on examination of stool under a microscope.
When diagnosing infectious gastroenteritis, conventional diagnostic methods such as faecal microscopy, culture, and sensitivities (and even biochemical tests and ELISA) can be laborious, expensive and insensitive. Additionally, although infection with multiple pathogens is common, existing diagnostic methods are typically ordered and performed for individual pathogens, such that these individual assays may routinely miss the diversity of infecting organisms.

What is tested in the PCR test?

Parasites:
• Giardia intestinalis
• Cryptosporidium
• Dientamoeba fragilis
• Entamoeba histolytica
• Blastocystis hominis

Bacteria:
• Campylobacter spp
• Salmonella spp
• Shigella spp
• Yersinia enterocolitica
• Aeromonas spp

Conditions:
• IBS
• Diarrhoea
• Bloating
• Chronic exhaustion/Fatigue
• Constipation
• Excess wind
• Skin irritations
• Never satisfied or full after meals
• Patients that have been on a recent vacation
• Abdominal pain

More at :
https://www.webmd.com/digestive-disorders/ss/slideshow-how-gut-health-affects-whole-body