Sign in →

Test Code Cephalexin Cephalexin

Important Note

Effective May 2020, this test will no longer be offered by Seattle Children's laboratory due to policy change from Infectious Disease.  There is not an alternative laboratory that offers this testing.

Clinical System Name

Cephalexin Level

Synonyms

Keflex

Sample Requirements

Specimen: Whole blood

Container(s): Gold SST, Gold Microtainer, Lt. Green/Lithium Heparin Microtainer

Preferred Vol: 1 mL

Minimum Vol: 0.5 mL

 

Note:  Q8 hour dosing: draw level 4 hours post oral dose

Q6 hour dosing: draw peak level 2 hours post oral dose

 

Processing Instructions

Reject due to:

Spin: Y

Aliquot: Y

Temp: - 20 C

Storage location: CPA Freezer, Fz5 rack.

 

Off-site collection:  Q8 hour dosing: draw level 4 hours post oral dose. Q6 hour dosing: draw peak level 2 hours post oral dose. Spin blood, aliquot serum or plasma and send frozen.

Stability

Specimen Type Temperature Time
  Room temp 4 h
  Refrigerated 48 h
  Frozen 1 m

 

Availability

STAT Performed TAT
N M - F, day shift 1 - 3 d

 

Performing Laboratory

Seattle Children's Laboratory    

Department

Department:  Chemistry

Location: Chem West

Phone Number: (206) 987-2617

 

CPT Codes

80299

Methodology

Method: HPLC

Analytical Volume: 0.2 mL serum or plasma

Limitations:

Reference Range

i. Q8 hour dosing: ≥22 μg/ml for osteomyelitis, ≥10 μg/ml for septic arthritis

ii. Q6 hour dosing: ≥15 μg/ml for osteomyelitis, N/A for septic arthritis