Nursing Central: Phosphorus, Blood

Phosphorus, Blood

General

Synonym/Acronym:
Inorganic phosphorus, phosphate, PO₄.

Common Use:
To assist in evaluating multiple body system functions by monitoring phosphorus levels in relation to other electrolytes. Used specifically to evaluate renal function in at-risk patients.

Specimen:
Serum (1 mL) collected in a red- or tiger-top tube. Plasma (1 mL) collected in green-top (heparin) tube is also acceptable.

Normal Findings:
(Method: Spectrophotometry)

Age	Conventional Units	SI Units (Conventional Units × 0.323)
0–5 day	4.6–8 mg/dL	1.5–2.6 mmol/L
1–3 yr	3.9–6.5 mg/dL	1.3–2.1 mmol/L
4–6 yr	4–5.4 mg/dL	1.3–1.7 mmol/L
7–11 yr	3.7–5.6 mg/dL	1.2–1.8 mmol/L
12–13 yr	3.3–5.4 mg/dL	1.1–1.7 mmol/L
14–15 yr	2.9–5.4 mg/dL	0.9–1.7 mmol/L
16–19 yr	2.8–4.6 mg/dL	0.9–1.5 mmol/L
Adult	2.5–4.5 mg/dL	0.8–1.4 mmol/L
Values may be slightly decreased in older adults due to dietary insufficiency or the effects of medications and the presence of multiple chronic or acute diseases with or without muted symptoms.

Phosphorus, Blood has been found in Davis's Lab & Diagnostic Tests

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