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Test ID FFURO Furosemide (Lasix)

Method Name

High Performance Liquid Chromatography with Fluorescence

Reporting Name

Furosemide (Lasix)

Specimen Type


Specimen Required

Submit only 1 of the following specimens:



Draw blood in a green-top (sodium heparin) tube(s), plasma gel tube is not acceptable. Spin down and send 1 mL sodium heparin plasma refrigerated in a plastic vial.



Draw blood in a plain red-top tube(s), serum gel tube is not acceptable. Spin down and send 1 mL of serum refrigerated in a plastic vial.

Specimen Minimum Volume

0.25 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Varies Refrigerated (preferred) 7 days
  Frozen  180 days
  Ambient  72 hours

Reference Values

Expected serum furosemide concentration in patients on usual daily dosages:  Up to 5.0  ug/mL


Toxic:   greater than 50.0  ug/mL


Day(s) Performed

Monday through Sunday

Performing Laboratory

Medtox Laboratories, Inc.

CPT Code Information



LOINC Code Information

Test ID Test Order Name Order LOINC Value
FFURO Furosemide (Lasix) 3659-0


Result ID Test Result Name Result LOINC Value
Z1189 Furosemide 3659-0

Report Available

7 to 11 days

NY State Approved