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Phosphorus

Phosphorus Blood Test

Phosphorus works with calcium to maintain bone strength, which is especially important during pregnancy, breastfeeding, and menopause.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Age years

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Your reference range

mmol/l

0,73 1,52 mmol/l

Reference ranges by group, in mmol/l
Sex	Age	Reference range (mmol/l)	Relative scale
Female	· 13–18 years	0,82–1,52 mmol/l	0,82 1,52
Female	· 19 years and older	0,73–1,4 mmol/l	0,73 1,4

0,73 1,52 mmol/l

Source: NVKC Reference population: Dutch general-practice population (NUMBER, n = 7,574,327)

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

Phosphorus: what this test measures

This test measures the level of inorganic phosphate in your blood. It helps evaluate bone health, kidney function, and parathyroid activity.

Phosphorus: why this value matters

Phosphorus is essential for energy storage and transfer (as ATP), bone mineralisation, and DNA synthesis. Imbalances may be associated with bone disorders, kidney disease, or hormonal conditions. Consult your healthcare provider for guidance.

Phosphorus: how the blood test works

Referral: No GP referral needed. After the order we arrange the referral through ZorgDomein, within one business day; orders after 17:00 or at the weekend start on the next business day. ZorgDomein emails a barcode, and that barcode is what the draw site needs.
The draw: A blood draw from a vein in the arm, at a partner laboratory's draw site. No home kit, no finger prick.
Where: 650+ draw sites run by independent laboratories across the Netherlands. Draw sites

Phosphorus: when is testing worthwhile?

Testing may be recommended alongside calcium testing, or if you have kidney disease, bone disorders, parathyroid conditions, or symptoms of mineral imbalance.

Phosphorus: symptoms of a high or low value

Low Levels

Symptoms of low phosphorus may include bone pain, weakness, loss of appetite, numbness, and difficulty breathing. Severe deficiency can affect bone integrity.

High Levels

High phosphorus is often linked to kidney disease and may cause itching, joint pain, muscle cramps, and calcium deposits in soft tissues. Medical evaluation is recommended.

Phosphorus: what to do about an abnormal value

Female

If Low

Low phosphorus may cause muscle weakness. Consider dietary adjustment.

If High

High phosphorus may indicate kidney problems. Consider kidney function testing.

Phosphorus: lifestyle and this value

Phosphorus is widely available in foods such as dairy, meat, fish, nuts, and beans. Most people obtain adequate phosphorus through diet. If you have kidney concerns, your healthcare provider may advise monitoring phosphorus intake.

Phosphorus: frequently asked questions

How are phosphorus and calcium related?

Phosphorus and calcium work together to build and maintain bones. Their levels are regulated by parathyroid hormone and vitamin D. An imbalance in one often affects the other.

Can kidney disease affect phosphorus levels?

Yes, the kidneys regulate phosphorus excretion. When kidney function declines, phosphorus may accumulate in the blood. Your healthcare provider can advise on management.

Is phosphorus in processed foods a concern?

Phosphorus additives in processed foods are absorbed more readily than natural phosphorus. Excessive intake from processed foods may be a concern for those with kidney conditions. Consult your healthcare provider.

Phosphorus: sources

den Elzen WPJ, Brouwer N, Thelen MH, Le Cessie S, Haagen I-A, Cobbaert CM. NUMBER: standardized reference intervals in the Netherlands using a 'big data' approach. Clin Chem Lab Med 2018;57(1):42-56. (retrieved 2026) doi.org

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Comprehensive metabolic panel: electrolytes, kidney, liver, glucose, HbA1c, and protein.

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