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HelpTest Code PHOS Phosphorus, Plasma or Serum
Additional Codes
LAB113
Methodology
Used to monitor phosphorus metabolism.
Performing Laboratory
St. Mary's Regional Medical Center-Chemistry
CPT: 84100
Specimen Requirements
Submit only 1 of the following specimens:
Plasma
Container/Tube: Light green-top (lithium heparin) tube
Specimen: 1 mL of lithium heparin plasma
Transport Temperature: Ambient
Collection Instructions: Hemolyzed specimen will cause falsely elevated values. Icterus or lipemic specimen may yield falsely decreased results.
Note: 1. Indicate plasma.
2. Label specimen appropriately (plasma).
Serum
Container/Tube: Plain, red-top tube or serum gel tube
Specimen: 1 mL of serum
Transport Temperature: Ambient
Collection Instructions: Serum should be separated from red cells promptly because red cells contain phosphate concentrations several times greater than those found in serum. Hemolyzed specimen will cause falsely elevated values. Icterus or lipemic specimen may yield falsely decreased results.
Note: 1. Indicate serum.
2. Label specimen appropriately (serum).
Reference Values
Males
0-30 days: 2.8-7.0 mg/dL
31-90 days: 3.1-6.6 mg/dL
3-12 months: 3.1-6.6 mg/dL
13-24 months: 3.1-6.2 mg/dL
2-<13 years: 3.1-5.9 mg/dL
13-<16 years: 3.1-5.3 mg/dL
16-18 years: 3.1-5.1 mg/dL
>19 years: 2.5-4.9 mg/dL
Females
0-30 days: 3.1-7.7 mg/dL
31-90 days: 3.1-7.2 mg/dL
3-12 months: 3.1-6.8 mg/dL
13-24 months: 3.1-6.3 mg/dL
2-<13 years: 3.1-5.9 mg/dL
13-<16 years: 3.1-5.5 mg/dL
16-18 years: 3.1-4.8 mg/dL
>19 years: 2.5-4.9 mg/dL
Call criteria (automatic call-back): <1.0 mg/dL or >7.5 mg/dL
Triglycerides >600 mg/dL and bilirubin >20 mg/dL will cause depressed phosphorus values.
Day(s) Test Set Up
Monday through Sunday
Available STAT