Kidney Disease (Chronic Kidney Disease) — NZ Condition Guide | KiwiMeds

What is Kidney Disease (Chronic Kidney Disease)?

Chronic kidney disease (CKD) is a long-term condition where the kidneys gradually lose their ability to filter waste and excess fluids from the blood. It affects around 10% of New Zealanders and is a major public health concern, especially among Māori and Pacific peoples who have significantly higher rates.

Overview

CKD develops slowly over months or years. Early stages often have no symptoms — it is frequently discovered through routine blood or urine tests. As CKD progresses, symptoms can include fatigue, swollen ankles and feet, shortness of breath, nausea, poor appetite, difficulty concentrating, and high blood pressure. CKD is staged 1–5 based on kidney function (measured by eGFR — estimated glomerular filtration rate). Stage 5 is kidney failure (end-stage renal disease), requiring dialysis or kidney transplant. The leading causes in NZ are diabetes and high blood pressure.

Treatment in New Zealand

Managing CKD focuses on slowing progression and managing complications. Blood pressure control is critical — ACE inhibitors or ARBs (lisinopril, ramipril, losartan) are first-line and also protect the kidneys. SGLT2 inhibitors (empagliflozin, dapagliflozin) are now Pharmac-funded and proven to slow CKD progression in people with or without diabetes. Avoiding NSAIDs (ibuprofen, naproxen) is important — they reduce kidney blood flow. For end-stage CKD, dialysis (haemodialysis or peritoneal dialysis) or kidney transplantation are the options.

NZ-Specific Information

Kidney Health New Zealand (kidneyhealthnz.org.nz) provides support. Māori and Pacific peoples are over-represented in end-stage kidney disease — Te Whatu Ora is working to improve early detection and culturally appropriate care. Regular eGFR and urine albumin:creatinine ratio (UACR) testing is funded through GPs.

Frequently Asked Questions

Is CKD the same as kidney failure? No — CKD is a spectrum. Most people with early-stage CKD never progress to kidney failure. Can I prevent CKD from getting worse? Yes — controlling blood pressure and blood sugar, avoiding nephrotoxic drugs, and following medical advice can slow progression significantly.

Supplements That May Support Management

⚠️ Important: The supplements listed below have varying levels of clinical evidence. They are not a substitute for prescribed medications and should only be considered as adjunctive support under the guidance of a qualified healthcare professional. Always inform your GP or pharmacist before commencing any supplement, as interactions with prescribed medicines are possible.

• Vitamin D (under nephrologist guidance) — Vitamin D deficiency is near-universal in advanced CKD due to impaired renal activation of vitamin D. Active vitamin D analogues (alfacalcidol, calcitriol) are prescribed by nephrologists for secondary hyperparathyroidism management. Standard vitamin D supplements may also be required for baseline deficiency.
• Iron (prescribed, not OTC supplements) — Anaemia of CKD involves both erythropoietin deficiency and iron deficiency/functional iron deficiency. Iron supplementation (oral or intravenous, as directed by your nephrologist) is a core component of anaemia management.
• Omega-3 Fatty Acids — Omega-3 supplementation may provide modest renal protective benefit and reduces cardiovascular risk, which is the primary cause of mortality in CKD. Doses of 1–4 g/day have been studied.
• Avoid: nephrotoxic supplements (aristolochic acid, chromium excess, excessive vitamin C) — Many herbal and traditional supplements contain nephrotoxic compounds. High-dose vitamin C (>1000 mg/day) generates oxalate which can worsen kidney stone disease and CKD. Always consult your nephrologist before taking any supplement.

Relevant Vaccinations

Individuals living with chronic kidney disease (CKD) may benefit from the following vaccinations. Please discuss your vaccination status with your GP or practice nurse, as eligibility and funding through the New Zealand National Immunisation Schedule may apply.

• Influenza (annual) — People with CKD have impaired immune response. Annual influenza vaccination is strongly recommended and funded. Higher-dose or adjuvanted formulations may provide better immunogenicity in advanced CKD.
• Pneumococcal (PCV20 and PPSV23) — Funded and strongly recommended for people with CKD, who are at significantly increased pneumococcal infection risk.
• Hepatitis B — People with CKD, particularly those approaching dialysis, require hepatitis B vaccination. Higher doses or repeated series may be needed as immune response is reduced. Vaccination before dialysis is recommended.
• COVID-19 — CKD is a high-risk condition for severe COVID-19. Maintaining vaccination and booster doses is strongly recommended.

Dietary Guidance

Evidence-based dietary modifications play a meaningful role in the management of chronic kidney disease (CKD). The following foods are generally recommended as part of a balanced, condition-appropriate diet. A referral to a registered dietitian may be beneficial for personalised nutritional planning.

• Protein-controlled diet (under dietitian guidance) — In CKD stages 3–5, moderate protein restriction (0.6–0.8 g/kg/day) reduces the accumulation of nitrogenous waste products and may slow disease progression. This requires careful dietitian supervision to avoid malnutrition.
• Potassium restriction (in advanced CKD) — Hyperkalaemia is life-threatening in CKD stages 4–5. High-potassium foods (bananas, potatoes, tomatoes, legumes) may need to be limited. However, restriction varies by individual potassium levels — always follow your nephrologist’s or dietitian’s specific guidance.
• Phosphate restriction (in advanced CKD) — Elevated phosphate damages blood vessels and worsens renal bone disease. Processed foods, cola drinks, and dairy require moderation in advanced CKD. Phosphate binders (prescribed) are often needed.
• Sodium restriction (≤2000 mg/day) — Sodium restriction reduces blood pressure and fluid overload, both critical in CKD progression and cardiovascular risk management.
• Anti-inflammatory whole foods — An anti-inflammatory dietary pattern reduces CKD progression risk. Mediterranean-style eating (appropriate for early CKD) supports renal and cardiovascular outcomes simultaneously.

Related Conditions & Medications

Related conditions: Hypertension, Type 2 Diabetes.