How to talk to your other doctors about your kidneys

If you have chronic kidney disease, you almost certainly have a team of doctors: your primary care physician, your nephrologist, often a cardiologist or endocrinologist, a dentist, sometimes a urologist or a foot doctor, and whoever’s on duty when something acute sends you to urgent care.

Here’s the uncomfortable truth: most of those clinicians won’t look up your kidney function before prescribing or ordering a procedure unless you bring it up. They’re not careless. They’re moving through a busy schedule and trusting that important things will surface. You are the connecting thread. This article is about making that role easy.

Why it matters

Several common situations can change meaningfully when CKD is in the picture:

• Pain medications.NSAIDs (ibuprofen, naproxen, and most over-the-counter anti-inflammatories) can worsen kidney function, particularly in advanced CKD or when you’re dehydrated. Acetaminophen is generally safer at typical doses.
• Contrast dye. CT scans with iodinated contrast and MRIs with gadolinium contrast both need a conversation when your eGFR is below about 30 mL/min. Often the scan can still happen — it just needs planning, such as IV pre-hydration or choosing a different contrast agent.
• Antibiotics. Some antibiotics — including certain commonly prescribed ones — need a lower dose or a different choice based on kidney function. Your pharmacist can be a strong backstop here.
• Diabetes medications. Metformin, the most common diabetes medicine, has eGFR thresholds where the dose changes or the medicine stops. Newer classes (like SGLT2 inhibitors) can actually protect the kidneys, but have their own considerations.
• Bowel prep before a colonoscopy. Some preps are phosphate-based and dangerous in CKD. There are safer alternatives that gastroenterology can usually substitute.

The opening line

At the start of any non-nephrology appointment — primary care, dentist, urgent care, a surgeon you’re seeing for the first time — try this:

Before you prescribe anything or order any imaging, I want to mention I have Stage __ CKD with a recent eGFR of about __. Can you check whether anything needs to be dose-adjusted or substituted for my kidneys?

That one sentence does three things: it tells the clinician something they need to know, it puts the responsibility on the prescription, not on you, and it signals that you are paying attention. Most clinicians appreciate this kind of patient.

Your one-page kidney card

For the things you don’t want to recite from memory, bring a card. Below is a template you can fill in and print. Keep one in your wallet, one on your fridge, and offer one to any new clinician you see. It’s not medical advice — it’s a one-page summary of you.

Situation-specific notes

Before a CT scan or MRI with contrast

If the scan involves contrast and your eGFR is below 30, tell the scheduler when you book and tell the technologist again when you arrive. The radiologist may want to pre-hydrate you with IV fluids, switch to a different scan, or adjust the contrast dose. For MRI, gadolinium is a particular concern at very low eGFRs — newer agents are considered safer, but your nephrologist’s input matters.

Before a dental procedure

Most routine dental care is completely fine. Two things to flag for your dentist:

• If you have a fistula or graft for hemodialysis, dental work and the antibiotic conversation around it are slightly different.
• If you’re on PD, an infection in your mouth has somewhere to go. Antibiotic prophylaxis is sometimes considered for invasive procedures.

Your nephrologist and your dentist can sort this in a single email — your job is just to make sure they talk.

At urgent care or the ER

Lead with the kidney card. Say out loud: “I have CKD, my last eGFR was __, and my nephrologist is at California Renal Care.” Ask that they avoid NSAIDs and double-check any antibiotic or contrast decision. If you’re sick enough to be dehydrated, mention any blood pressure medications you take (especially ACE inhibitors or ARBs) — they sometimes need to be held until you’re back to baseline.

When a new medication is being prescribed

Two questions to ask, every time:

• Does this need a dose adjustment for my kidneys?
• Is there a kidney-safer alternative that does the same thing?

If you have a pharmacist you trust, this is also a place where they shine. Pharmacists are trained to catch dose-by-kidney-function issues and are usually delighted when patients ask.

You are not asking for special treatment

Patients sometimes feel awkward bringing this up — like they’re being difficult. They’re not. CKD is a medical condition that changes how the rest of medicine should be practiced for them. Telling a new clinician about it is no different from telling them about a drug allergy.

Most clinicians, when given the information up front, will adjust on the spot and thank you for it. The ones who don’t are the ones you most needed to know about.

The shortest version of all of this

Carry the card. Open with the script. Trust your nephrologist to be a phone call away if anything is uncertain. You are the connecting thread — and you’re very good at it.