강아지 신장 기능 조기 선별(SDMA) 자주 묻는 질문 Q&A — 보호자가 꼭 알아야 할 핵심

Early Screening for Kidney Function in Dogs (SDMA) — Why It’s Needed and When to Get It

KidneyQ&AMeongsiljang Veterinary Advisory Board

Early screening for kidney function in dogs (SDMA) is a key test for detecting kidney damage caused by aging or disease at an early stage. We’ve compiled essential questions and answers that pet owners should know.

What Is Early Screening for Kidney Function (SDMA) in Dogs?

A veterinarian and a puppy undergoing an early screening test for kidney function (SDMA)

The SDMA test is a blood test that helps assess your dog’s kidney function early on, allowing for the detection of kidney impairment at a relatively early stage. - SDMA levels: SDMA is a sensitive indicator of kidney dysfunction, rising earlier than creatinine to help identify abnormalities sooner. - Significance of early screening: According to veterinary literature, SDMA levels begin to rise when kidney function is impaired by approximately 40%, enabling earlier detection of issues compared to creatinine. - Recommendation for regular check-ups: For senior dogs or those at risk of kidney disease, it is advisable to regularly monitor kidney markers alongside medical history, physical examinations, and urinalysis. - Veterinarian’s advice: SDMA should not be interpreted in isolation but rather in conjunction with urinalysis and other blood tests. Early detection aids in managing the condition and slowing its progression.

Why Is the SDMA Test More Important Than Traditional Tests?

Traditional creatinine tests often only show abnormalities after kidney function has already been significantly impaired. - SDMA Testing: According to veterinary textbooks, SDMA levels rise when kidney function is approximately 40% impaired, allowing for earlier detection compared to creatinine, which typically doesn’t rise until about 75% of kidney function is lost. - Advantages of Early Detection: SDMA is more effective than creatinine at identifying kidney disease in its earlier stages. - Timing of Treatment: Early detection enables veterinarians to begin management plans—such as dietary adjustments and fluid supplementation—sooner. - Important Interpretation Notes: Elevated SDMA can result not only from intrinsic kidney issues but also from pre-renal factors like dehydration, so it should never be interpreted in isolation. - Veterinary Recommendation: Regular SDMA testing helps monitor early changes in kidney function associated with aging or genetic predispositions.

Comparing the early detection capabilities of SDMA and creatinine tests

When Should Dogs Get an SDMA Test?

As your dog enters its senior years, it’s a good idea to regularly monitor kidney health indicators. - Breeds with reported risk: According to veterinary textbooks, Shetland Sheepdogs, Yorkshire Terriers, Pomeranians, and Boxers have been identified as breeds at higher risk for elevated creatinine and SDMA levels. - Increased risk with aging: The risk of declining kidney function rises with age, making regular check-ups beneficial. - Testing when symptoms appear: If you notice increased water consumption or urination, weight loss, or other changes, consult your veterinarian about testing. - Part of routine wellness exams: Even in healthy dogs, including SDMA testing alongside medical history, physical examination, and urinalysis can help assess kidney health. Early detection is the first step in effective management.

Recommended Calendar for Scheduling SDMA Tests in Dogs

What to Do If SDMA Test Results Are High

Elevated SDMA levels may indicate reduced kidney function, specifically a decline in glomerular filtration rate (GFR). - Seek immediate consultation: The first step is to consult with your veterinarian. - Further testing required: Accurately identify the underlying cause through urinalysis, abdominal ultrasound (focusing on the kidneys), blood pressure measurement, and urine protein-to-creatinine ratio (UPC) testing. - Differentiate the cause: An increase in SDMA can result from factors other than intrinsic kidney disease, such as dehydration (prerenal causes), so non-renal causes must also be evaluated. - Recheck and monitor trends: Due to analytical and biological variability, values near the reference range should be interpreted cautiously through retesting and trend analysis. - Develop a treatment plan: Establish a management plan that includes dietary adjustments and fluid supplementation. Early detection and management can help slow disease progression.

A veterinarian making a diagnosis when SDMA levels are elevated.

High SDMA Levels Require an Immediate Veterinary Visit

If SDMA levels fall outside the normal range, it may indicate a decline in kidney function. However, SDMA can also be elevated due to non-renal factors such as dehydration, so it’s important to consult with your veterinarian for retesting and additional diagnostics to determine the underlying cause.

5 Signs to Check Along With the SDMA Test

In addition to SDMA testing, carefully monitor the following signs: - Increased water intake and urination (polydipsia/polyuria): This is a common indicator of declining kidney function. Be alert if your pet drinks more water than usual or produces a larger volume of urine. - Vomiting and bad breath: Reduced kidney function can lead to vomiting and an unpleasant odor from the mouth. - Weight loss: Persistent weight loss accompanied by a decreased appetite may signal kidney issues. - Fatigue and reduced activity: If your pet seems unusually lethargic or less active than normal, consider having them examined. - Decreased appetite: If your pet is eating poorly or consuming only small amounts, consult your veterinarian. Early detection is the first step in effective management.

Checklist for Signs of Kidney Function Abnormalities in Dogs

SDMA Test vs. Traditional Kidney Tests: A Comparison

Item	SDMA test	Creatinine test
Point of early detection	Rises when about 40% of kidney function is lost	Rises when about 75% of kidney function is lost
Sensitivity for early detection	High (rises earlier)	Low (rises in later stages)
Recommended use	Useful for early screening and routine monitoring	Basic marker for assessing kidney function
Cautions in interpretation	May reflect extra-renal causes such as dehydration or give false positives; retesting needed	May read low when muscle mass is reduced

SDMA rises earlier than creatinine, making it useful for early detection of kidney disease, but false positives can occur due to extra-renal factors such as dehydration or assay variability, so retesting and trend monitoring are needed.

4 Management Tips After an SDMA Test

Don’t worry too much if your SDMA test results are abnormal. - Dietary management: Follow the renal prescription diet recommended by your veterinarian. Renal diets are formulated to reduce kidney strain by lowering protein, phosphorus, and sodium levels while supplementing omega-3 fatty acids and antioxidants. - Hydration management: Always provide plenty of clean water to maintain proper hydration. - Follow your veterinarian’s instructions: Always consult your veterinarian to determine the appropriate diet and care plan. - Regular check-ups: Communication with your veterinarian and regular check-ups are key to long-term health management. Early detection and care can help improve your pet’s quality of life.

Scene showing water intake management after an SDMA test

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Does the SDMA test cause pain in dogs?

The test involves drawing blood, which may cause a brief moment of discomfort when the needle is inserted, but it's over very quickly. Most dogs tolerate it well.

How much does an SDMA test cost?

Test costs vary by clinic, typically ranging from $20 to $40, and may be included in routine check-ups. Please contact your clinic directly to confirm insurance coverage.

If my pet’s SDMA test result is high, do I absolutely need to visit the vet?

Yes, it's a good idea to consult with a veterinarian. Elevated SDMA levels can be a sign of reduced kidney function (decreased GFR). However, they can also increase due to non-renal factors like dehydration or test variability, so it's important to confirm the cause through retesting and additional examinations.

My dog is 3 years old. Can he have an SDMA test?

While three years of age is generally too early for routine screening, dogs of breeds with genetic risk factors or those showing symptoms can be tested after consulting with a veterinarian.

If the SDMA test results are normal, can I rest assured?

Normal results are a good sign. However, we recommend regular check-ups for dogs at risk of aging or disease, as early detection is the most important factor.