The Role of Kidney Diagnostics in Overall Pet Health
Monitoring kidney health in veterinary patients is about more than chronic kidney disease (CKD). Kidney diagnostics open a window into a patient’s overall health – and this is important at all life stages, in both well and sick pets. The kidneys provide veterinarians with the information they need to proceed with confidence when delivering results to clients and creating a treatment plan.
As a foundation for systemic health, the kidneys support nearly every organ and process within the body. A few of their key roles include blood pressure management, red blood cell production, hormonal balance and clearance of metabolic byproducts and toxins.25 While kidney diagnostics are used extensively for the monitoring and management of CKD, they can do so much more by informing the veterinarian on overall multi-system function and the possibility of injury or illness affecting the kidneys and other vital organs.
Abnormal Results Facilitate Appropriate Investigation
When renal screening results are found to be outside the normal reference interval, they can indicate kidney health issues such as a reduction in kidney function, injury to the kidneys or another organ, metabolic disruption or various other processes that threaten homeostasis, long-term health or a patient’s ability to tolerate anaesthesia. A change to a renal value or values such as blood urea, creatinine, and SDMA may not offer a definitive clinical diagnosis, but it does wave the red flag needed to decide if further investigation is warranted.
For example, some infectious diseases may cause obvious clinical signs, or they may go entirely undetected for extended periods of time. Because they are central to systemic health, the kidneys are often concurrently affected by infectious disease, and SDMA can provide an early indication of kidney health issues and kidney function decline. An elevation in SDMA, with or without clinical symptoms, could alert veterinarians to the need to investigate disease as an underlying or hidden issue.19,20
Renal Assessment Impacts Anaesthetic Choices and Safety
Veterinarians know all too well that patients tend to mask underlying disease for as long as possible. In a clinical study, diagnostic testing (consisting of a chemistry panel, complete blood count, SDMA testing, urinalysis and TT4 {in mature cats aged 7+ years}) in more than 200,000 outwardly healthy pets uncovered clinically relevant abnormalities in 1 in 5 mature adult dogs (aged 4 – 8 years) and 1 in 3 mature adult cats (aged 7 – 9 years). Because of this, SDMA is particularly useful as it indicates a decline in kidney function earlier than other biomarkers.1,2,5
This can be especially important when creating the safest possible anaesthetic plan for a patient. If there is an indication that the kidneys may not be working properly, adjustments can be made to anaesthetic choices to help lessen the negative impact on blood pressure.25
Kidney Assessment as a Monitoring and Management Tool for Disease
The results from kidney diagnostics can be used to monitor the improvement and management of infectious and chronic diseases.
Monitoring Cat Kidney Health and Kidney Function
For cats, SDMA and renal biomarkers are routinely used to monitor progression and make treatment choices in cases of CKD. Two other conditions that warrant SDMA monitoring in felines are hyperthyroidism and retroviral infections – feline leukaemia virus (FeLV) and feline immunodeficiency virus (FIV). Hyperthyroidism and retroviruses impact systemic health, including the kidneys.
Many cats with hyperthyroidism have a loss of muscle mass, which can lead to decreased creatinine production and an inaccurate picture of kidney health.14,15 However, SDMA is less affected by the decrease in lean muscle mass and is, therefore, a better monitoring tool in these patients.3,15
Earlier diagnosis of cat kidney health issues such as concurrent renal disease with hyperthyroidism may have a positive impact on quality of life and survival time. Retroviruses, such as FeLV and FIV, are poorly understood, but veterinarians know they can impact kidney health and that symptoms related to these viruses can be compounded by a decline in kidney function. By detecting renal dysfunction earlier, veterinary professionals can obtain a clearer picture of disease progression and take steps to support the kidneys.3,15
The Importance of Kidney Health
When it comes to screening for overall health status, early disease detection and chronic condition management, the kidneys may very well be the most important organ for veterinary surgeons to keep their eyes on. Not only do kidney diagnostics provide information on the health of the kidneys themselves, but they can provide insight into the overall health of an animal, ultimately leading to better care and treatment.
References: https://www.thevetiverse.com/en/latest/sdma-references/
