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Tomato is moderate-high in potassium (~290 mg/100g). Early CKD: fine in portions. Stage 4-5 and dialysis: limit it — tomato products (sauce, juice, chutney) concentrate the potassium even more.
A fresh tomato carries ~290 mg potassium per 100g — not the worst, but not free either, and cooked or concentrated tomato (sauce, paste, juice) is far denser.
For advanced CKD and dialysis, limit tomato portions and especially tomato-based gravies and juice.
Bottom line: fresh tomato in counted portions for early CKD; limit for stage 4-5 and dialysis, with lemon as a low-K flavor alternative.
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This content is a general reference, not medical advice, a diagnosis, or a treatment plan. Do not change your diet, fluids, medicines, or dialysis plan without your nephrologist or renal dietitian. Individual recommendations depend on your labs, medications, conditions, and care plan.