Onion and CKD: Potassium, Phosphorus & Sodium Reference
Short answer: Onion is rated Kidney-friendly for CKD stage 3-4. Onion is rated Kidney-friendly. Of phosphorus, sodium and potassium, Potassium is highest (7%), all below 15% of limits.
About Onion
Onion sits in the Vegetables group. Vegetables are a key source of fiber and vitamins and are beneficial in CKD. Some are high in potassium, but slicing, boiling and discarding the water can remove about 30-50% of the potassium - a practical step.
Nutrient insight
From the potassium angle (7%), how much Onion fits depends on your latest lab values - this site only presents the data.
Phosphorus / Sodium / Potassium per 100 g
Phosphorus29 mg3%Low
Sodium4 mg<1%Low
Potassium146 mg7%Low
Practical tips
Worth remembering: Slice, boil and discard the water to remove roughly 30-50% of the potassium - a practical method for high-potassium vegetables.
See the full Onion food page →Lower-risk alternatives
Tree fernK 5 / P 4 mg
Tree fernK 5 / P 4 mg
ButterburK 12 / P 4 mg