I called the vet and asked specifically what kidney related testing was done on Merlin. Since he has historically had great kidney function and he did not, in her opinion look like he had issues, she ordered a SDMA test be done since they were able to get so much blood. Merlin's test came back smack dab in the middle of the normal range. She said the SDMA is the test that will show the earliest indications of kidney dysfunction onset. UPC is the test used after renal failure is manifest. Apparently, SDMA is a relatively new test that detects renal issues earlier. Prior to it, UPC was the go to test. Here are details regarding SDMA:
- Biomarker for kidney function Symmetric dimethylarginine (SDMA) is excreted by the kidneys. SDMA more accurately reflects glomerular filtration rate (GFR) in dogs and cats. Earlier than creatinine, SDMA increases as early as 25% loss of kidney function, making SDMA more reliable in both acute or active kidney injury and chronic kidney disease. Creatinine cannot identify kidney issues until almost 75% of kidney function is lost. It is an early test tool for detecting kidney disease in cats and dogs.
- SDMA is less impacted by extrarenal factors than creatinine, including body condition, advanced age, and disease state.
- SDMA is also not affected by lean body mass, making it more reliable for assessing kidney function in animals with chronic kidney disease or other conditions that result in weight and muscle loss, such as hyperthyroidism or diabetes.
I was thinking UPC was another blood test. UPC just needs a urine sample, no blood.