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Test Code PHOS Phosphorus Serum

Clinical System Name

Phosphorus Serum

Synonyms

Phosphate
PO4 - Blood

Description

Causes of high serum phosphorous include dehydration, hypoparathyroidism, hypervitaminosis D, metastases to bone, sarcoidosis, pulmonary embolism, renal failure, and diabetes mellitus with ketosis. Low serum phosphorous is found in primary hyperparathyroidism and other causes of serum calcium elevation, sepsis, Vitamin D deficiency, renal tubular disorders, chronic hemodialysis, vomiting, and occasionally with decreased dietary phosphate intake.

Sample Requirements

Specimen:  Whole Blood

Container(s): Gold SST, Dark Green/Sodium Heparin, Red

Preferred Vol:1 mL

Minimum Vol:  1 Gold Microtainer or 1 Lt. Green/Li Heparin Microtainer

 

Note: Method is affected by hemolysis, lipemia, fluoride, oxalate and EDTA. Not affected by icterus.

Processing Instructions

Reject due to: Insufficient Quantity, Marked Hemolysis

Spin: Y

Aliquot: Y

Temp:  2-4oC

Storage location:  Core Chemistry Refrigerator

 

Off-site collection:  Avoid hemolysis. Spin blood, separate serum or plasma from red cells promptly. Refrigerate serum or plasma.

Stability

 

Specimen Type Temperature Time
Serum or Plasma RT

3 D

Serum or Plasma 2-4oC

7 D

Serum or Plasma -20o C or -70oC

≤ 60 D

 

Availability

STAT Performed TAT
Y 24/7 1 H

 

Performing Laboratory

Seattle Children's Laboratory    

Department

Department:  Core Chemistry

Phone Number: 206-987-2617

 

Reference Range

 

  mg/dL
0 - 7 days 4.6 - 8.0
1 week - 4 years 3.9 - 6.5
4 - 7 years 4.0 - 5.4
7 - 12 years 3.7 - 5.6
12 - 14 years 3.3 - 5.4
14 - 16 years 2.9 - 5.4
16 - 60 years 2.8 - 4.6

 

Methodology

Method: Colorimetric method by Vitros 4600

Minimum Volume:  0.5 mL serum or plasma

Analytical Volume:  0.02 mL serum or plasma + 0.03 mL dead space

CPT Codes

84100

Critical Values

≤ 1.0 mg/dL

≥ 12.0mg/dL