PHOSPHORUS, whole blood
fB-P ATK 7005

Phosphorus and its compounds are nutritional factors of importance for the structure and function of the body. Various phosphorus salts (phosphates) participate in several steps of intermediary metabolism and play a vital role in cellular energetics. Phosphorus is a structural part of nucleic acids (DNA and RNA), which form the genetic code for all living cells. Phosphorus is an essential nutritional factor in protein production, growth and repair of cell damage. It is also an essential element in energy production and transport. It has important roles in the burning of carbohydrates, protein and fat.


Assessment of phosphorus reserves in the body.


5 mL of lithium or sodium heparin blood. Mix the sample well. The tube must not contain any clots. Take trace element samples last in order to cleanse the sampling needle of possible trace element residues. If this is the only test requisition, first take one extra tube.

No fasting is needed. No trace element supplements 12 hours before sampling. The result is normalised to whole blood haematocrit (Hkr) value (B-PVK). The client should determine the haematocrit prior to shipping the sample and write the result on the test requisition.

The Hkr is essential for interpretation of results. Without a measured Hkr value, standard Hkr is used.

Storage and delivery

Ship at room temperature on sampling day (shipping Mon-Thu). Store frozen over the weekend, ship at room temperature.

Method principle


Turnaround time

10 weekdays

Reference ranges, calculated

women 9.3 – 13.4 mmol/L (Hkr 0.39)
men 9.4 – 13.6 mmol/L (Hkr 0.42) 

The Hkr value affects the reference ranges. The same sample can be used to measure Cu, K, Mg, Mn, Se and Zn.