ARUP's Laboratory Test Directory

Antibiotic Level, Nafcillin : 0060843

Mnemonic: ML NAF

Methodology: Quantitative Bioassay
Performed: Sun-Sat
Reported: 1-2 days
Specimen Required: Collect: Plain red.

Specimen Preparation: Aseptically remove 2 mL serum to a sterile tube (ARUP supply #43115) and freeze. Available online through eSupply using ARUP Connect™ or contact ARUP Client Services at (800) 522-2787. (Min: 1 mL).

Storage/Transport Temperature: Frozen.

Remarks: Required information includes: time and date of collection, time of last dose, and list of all antibiotics that the patient is receiving or has received in the past 48 hours.

Unacceptable Conditions: Plasma.

Stability (collection to initiation of testing): Ambient: 2 hours; Refrigerated: 24 hours; Frozen: 1 week
Reference Interval:
8-40 µg/mL
Interpretive Data: Normal therapeutic peak serum concentration for nafcillin is 8-40 µg/mL. Trough serum concentration is not well established.

For bioassay measurements, the presence of other antimicrobial agents may interfere with the assay.  Other factors that may influence antimicrobial levels include inherent differences among patients and their underlying physical conditions as well as the dose and route of administration of the antimicrobial agent.
Note: Please include time of last dose, and list of all antibiotics that the patient is receiving or has received in the past 48 hours.  This information is important for laboratory handling and essential for subsequent physician interpretation of results. 
CPT Code(s): 80299
Cross References: Nafcillin Level (Antibiotic Level, Nafcillin), Nafcillin Level, BA (Antibiotic Level, Nafcillin)