The question behind the question
Almost every week, someone asks me a version of the same thing: “How do I know if my kidneys are okay?”
It sounds simple. It is not, because most people asking it have no symptoms at all. That is the nature of kidney disease. It moves quietly for years before it shows up as fatigue, swelling, or a blood pressure number that will not come down. By the time someone feels sick, a lot has already happened inside the body.
So when I get this question in clinic, I do not just answer it. I try to explain why it is the right question and what a real answer requires.
Why symptoms are the wrong place to start
People want a symptom checklist. I understand the instinct. It feels concrete and easy to check against yourself at home.
But kidneys do not work that way. They can lose a large share of their function while blood tests still look close to normal, and while the person feels fine. I have seen patients walk in for an unrelated reason and leave with a diagnosis they never expected. That is not a failure of attention on their part. It is how this organ behaves.
This is why I steer people away from symptom spotting and toward two numbers: a blood test called creatinine, used to estimate kidney filtering capacity, and a urine test that checks for protein. Neither takes long. Neither costs much compared to what happens if a problem is caught late.
Who actually needs to ask this question
Not everyone needs to run these tests every year. But some groups should ask this question long before anything feels wrong.
People with diabetes. People with high blood pressure, even if it is well controlled. People with a parent or sibling who had kidney disease. People who have taken certain pain medications regularly for years. These groups carry more of the real risk, and they are exactly the ones I see show up too late, often because nobody told them to look sooner.
I grew up in this city and built my practice here, so I see this pattern in the same neighborhoods, year after year. Risk factors that are common in a community tend to get treated as normal instead of as reasons to check.
What a good answer actually includes
When someone asks me this question properly, I do not hand them a single number and send them home. A good answer has three parts.
First, where the numbers sit right now compared to where they should sit for that person’s age and health history. Second, what direction those numbers are moving over time, since one reading tells you far less than a trend does. Third, what specifically to change, whether that is blood pressure control, diet, or a medication review, and how soon to check again.
That third part gets skipped more often than it should. A number without a next step is not useful. It just gives someone something to worry about.
The habit worth building
If I could get one habit to stick with every patient, it would be this: know your baseline numbers before you need them.
I ask people to think of it the same way they think of checking blood pressure or getting an eye exam. Not a reaction to feeling unwell, just a regular part of taking care of yourself. For kidneys specifically, catching a small change early gives far more options than catching a large one late. Early changes can often be slowed or stabilized with fairly simple steps. Late changes require far more from the patient and from the medical team.
What I tell people at the end of the visit
I tell people the same thing every time. This is not about fear. It is about information you can act on while you still have the most options.
Kidneys rarely announce a problem loudly. They tend to whisper it through a number on a lab report long before the body raises its voice. My job is to make sure that whisper gets heard, and that when someone does ask me the question, they leave with an answer they can actually use.
